CN103219640A - Method and device for restraining ASE (Amplified Spontaneous Emission) in high-power narrow-pulse optical fiber laser - Google Patents
Method and device for restraining ASE (Amplified Spontaneous Emission) in high-power narrow-pulse optical fiber laser Download PDFInfo
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Abstract
The invention discloses a method and a device for restraining ASE (Amplified Spontaneous Emission) in a high-power narrow-pulse optical fiber laser. The method comprises the following steps of modulating the repeated frequency of a seed laser emitted by a single mode laser diode seed source and modulating the output waveform of the seed laser as a second-order ultra Gaussian form by virtue of a pulse-driven power supply according to the output characteristic requirements of the output laser of the high-power narrow-pulse optical fiber laser; normally starting the high-power narrow-pulse optical fiber laser, enabling the average power of the output laser of the high-power narrow-pulse optical fiber laser to meet the output characteristic requirements, and detecting the pulse width of the output laser of the high-power narrow-pulse optical fiber laser by the use of a photoelectric detector and an oscilloscope; and under the condition that the detected pulse width does not meet the output characteristic requirements, modulating the pulse width of the seed laser emitted by the single mode laser diode seed source by virtue of the pulse-driven power supply so as to enable the pulse width of the output laser to meet the output characteristic requirements.
Description
Technical field
The present invention relates to field of mobile communication, particularly relate to inhibition method and the device of ASE in a kind of high power narrow pulse fiber laser.
Background technology
Fig. 1 is a high power narrow pulse fiber laser structure schematic diagram in the prior art, and as shown in Figure 1, at present laser diodes that adopt the burst pulse electrical modulation as seed source more, and the structure that connects fiber amplifier thereafter constitutes high power narrow pulse fiber laser.
As shown in Figure 1, the laser diode seed source adopts pulse driving power to drive, and can directly modulate the output parameter of seed laser (comprising: repetition rate, pulse duration, impulse waveform and watt level etc.) by adjusting its drive current.Fig. 2 is the schematic diagram of the different output waveforms of seed laser in the prior art, and as shown in Figure 2, the output waveform of seed laser can be modulated to Lorentz lorentz's type, gaussian-shape, two order super shape, hyperbolic secant shape etc.The burst pulse seed laser that seed source produces is finally realized the output of high power narrow-pulse laser through the subsequent optical fiber amplifier.Fig. 2 is respectively Lorentz lorentz's shape, gaussian-shape, hyperbolic secant shape and two order super shape from left to right.Solid line is represented the output waveform of seed laser among the figure, and dotted line is represented the situation of change of seed laser through output waveform behind the fiber amplifier.As can be seen from Figure 2, through behind the fiber amplifier, the narrow phenomenon of the pressure of the seed laser of two order super shape is the most obvious.
In above-mentioned structure as shown in Figure 1,, therefore in the optical fiber amplification process, can inevitably produce amplified spontaneous emission (ASE) because the average power of seed laser is far smaller than the pumping light power that fiber amplifier injects.Under the situation of this high power pump, the amplifier gain meeting improves rapidly between the pulse, and ASE can consequently reach capacity in run-up.The parasitic oscillation meeting that causes thus consumes the population that goes up energy level, is stored in energy in the gain fibre thereby limited with the active population form.ASE can reduce the amplification efficient of fiber amplifier, and damage also can be caused to seed source to ASE in the back, therefore must manage to be suppressed.
Summary of the invention
The invention provides inhibition method and the device of ASE in a kind of high power narrow pulse fiber laser, to solve the problem that in the optical fiber amplification process, produces ASE in the prior art.
The invention provides the inhibition method of ASE in a kind of high power narrow pulse fiber laser, comprise: according to the output characteristic requirement of the output laser of high power narrow pulse fiber laser, the repetition rate of the seed laser that sends by pulse driving power modulation single mode laser diode seed source, and the output waveform of seed laser is modulated to two order super shape; The normal high power narrow pulse fiber laser of opening, make the average power of the output laser of high power narrow pulse fiber laser satisfy the output characteristic requirement, and use photodetector and oscilloscope to survey the pulse duration of the output laser of high power narrow pulse fiber laser; Do not satisfy under the situation that output characteristic requires in the pulse duration of determine surveying, the pulse duration of the seed laser that sends by pulse driving power modulation single mode laser diode seed source makes the pulse duration of output laser satisfy the output characteristic requirement.
Preferably, output characteristic requires to comprise: average power, repetition rate and pulse duration.
Preferably, the pulse duration of the seed laser that sends by pulse driving power modulation single mode laser diode seed source, making the pulse duration of output laser satisfy output characteristic requires specifically to comprise: establish output characteristic require in pulse duration for being less than or equal to X nanosecond, then the pulse width modulation of the seed laser that the single mode laser diode seed source is sent by pulse driving power is nX nanosecond, wherein, n is a positive integer; The pulse duration of surveying at seed laser by photodetector and oscilloscope is that nX is during nanosecond, whether the pulse duration of output laser is less than or equal to X nanosecond, if the judgment is Yes, the pulse duration of then determining seed laser this moment is final pulse duration, if the judgment is No, then continue modulation by pulse driving power, the pulse duration of the seed laser that minimizing single mode laser diode seed source sends, and survey the pulse duration of output laser after the pulse duration that reduces seed laser by photodetector and oscilloscope, and the pulse duration of exporting laser be less than or equal to X during nanosecond the pulse duration of pairing seed laser be set to final pulse duration.
Preferably, n equals 3.
Preferably, continuation is by the modulation of pulse driving power, the pulse duration of the seed laser that minimizing single mode laser diode seed source sends, and after the pulse duration by photodetector and oscilloscope detection minimizing seed laser, the pulse duration of output laser, and the pulse duration of exporting laser be less than or equal to X during nanosecond the pulse duration of pairing seed laser be set to final pulse duration and specifically comprise: by the modulation of pulse driving power, from nX nanosecond, the pulse duration of the seed laser that the single mode laser diode seed source is sent is each to reduce by 1 nanosecond, and survey the pulse duration of every this output laser when reducing by 1 nanosecond of the pulse duration of seed laser by photodetector and oscilloscope, the pulse duration of output laser be less than or equal to X during nanosecond the pulse duration of pairing seed laser be set to final pulse duration.
The present invention also provides the restraining device of ASE in a kind of high power narrow pulse fiber laser, comprise: first modulation module, be used for output characteristic requirement according to the output laser of high power narrow pulse fiber laser, the repetition rate of the seed laser that sends by pulse driving power modulation single mode laser diode seed source, and the output waveform of seed laser is modulated to two order super shape; Detecting module, be used for normally opening high power narrow pulse fiber laser, make the average power of the output laser of high power narrow pulse fiber laser satisfy the output characteristic requirement, and use photodetector and oscilloscope to survey the pulse duration of the output laser of high power narrow pulse fiber laser; Second modulation module, be used for determining that the pulse duration of surveying does not satisfy under the situation of output characteristic requirement, the pulse duration of the seed laser that sends by pulse driving power modulation single mode laser diode seed source makes the pulse duration of output laser satisfy the output characteristic requirement.
Preferably, output characteristic requires to comprise: average power, repetition rate and pulse duration.
Preferably, second modulation module specifically comprises: the first modulation submodule, being used for requiring pulse duration in output characteristic is to be less than or equal under the situation of X nanosecond, the pulse width modulation of the seed laser that the single mode laser diode seed source is sent by pulse driving power is nX nanosecond, wherein, n is a positive integer; The second modulation submodule, the pulse duration that is used for surveying at seed laser by photodetector and oscilloscope is that nX is during nanosecond, whether the pulse duration of output laser is less than or equal to X nanosecond, if the judgment is Yes, the pulse duration of then determining seed laser this moment is final pulse duration, if the judgment is No, then continue modulation by pulse driving power, the pulse duration of the seed laser that minimizing single mode laser diode seed source sends, and survey the pulse duration of output laser after the pulse duration that reduces seed laser by photodetector and oscilloscope, and the pulse duration of exporting laser be less than or equal to X during nanosecond the pulse duration of pairing seed laser be set to final pulse duration.
Preferably, n equals 3.
Preferably, the second modulation submodule specifically is used for: by the modulation of pulse driving power, from nX nanosecond, the pulse duration of the seed laser that the single mode laser diode seed source is sent is each to reduce by 1 nanosecond, and survey the pulse duration of every this output laser when reducing by 1 nanosecond of the pulse duration of seed laser by photodetector and oscilloscope, the pulse duration of output laser be less than or equal to X during nanosecond the pulse duration of pairing seed laser be set to final pulse duration.
Beneficial effect of the present invention is as follows:
The impulse waveform of the seed laser that sends by accurate control seed source, the pulse duration of guaranteeing seed laser can significantly be pressed narrow in the optical fiber amplification process, even the pulse duration broad of seed laser, can guarantee that still the laser of the final output of fiber laser satisfies the application requirements of narrow pulsewidth, solved the problem that in the optical fiber amplification process, produces ASE in the prior art, can improve the average power of seed laser by the pulse duration that increases the seed source seed laser, reach the purpose that effective inhibition ASE produces.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of specification, and for above and other objects of the present invention, feature and advantage can be become apparent, below especially exemplified by the specific embodiment of the present invention.
Description of drawings
By reading hereinafter detailed description of the preferred embodiment, various other advantage and benefits will become cheer and bright for those of ordinary skills.Accompanying drawing only is used to illustrate the purpose of preferred implementation, and does not think limitation of the present invention.And in whole accompanying drawing, represent identical parts with identical reference symbol.In the accompanying drawings:
The restraining device of ASE in Fig. 1 high power narrow pulse fiber laser;
Fig. 2 is the schematic diagram of the different output waveforms of seed laser in the prior art;
Fig. 3 is the flow chart of the inhibition method of ASE in the high power narrow pulse fiber laser of the embodiment of the invention;
Fig. 4 is the structural representation of the high power burst pulse Yb-doped double-cladding fiber laser of the embodiment of the invention;
Fig. 5 is the structural representation of the restraining device of ASE in the high power narrow pulse fiber laser of the embodiment of the invention.
Embodiment
Exemplary embodiment of the present disclosure is described below with reference to accompanying drawings in more detail.Though shown exemplary embodiment of the present disclosure in the accompanying drawing, yet should be appreciated that and to realize the disclosure and the embodiment that should do not set forth limits here with various forms.On the contrary, it is in order to understand the disclosure more thoroughly that these embodiment are provided, and can with the scope of the present disclosure complete convey to those skilled in the art.
The average power that increases seed laser is one of most effectual way that suppresses ASE.Because the average power=peak power * pulse duration * repetition rate of seed laser pulse, under the certain condition of seed source repetition rate, can reach the purpose that increases the seed laser average power by the method that improves its peak power and/or pulse duration.But the peak power of the seed laser pulse that seed source sends has been applied to the limit at present by its inherent characteristic decision, can't continue to promote, and therefore increases the method that the seed laser average power has only the pulse duration of considering the increase seed laser.
Pulse duration that it should be noted that seed laser can not increase arbitrarily.This be because, in the application of numerous high power narrow pulse fiber lasers, the pulse duration of final output laser is had concrete requirement, need be limited in a certain scope usually.If increase the pulse duration of seed laser arbitrarily, in the process of follow-up multistage amplification, might produce pulsewidth press narrow, pulsewidth is constant or multiple phenomenon such as pulse stretcher.In this case, though the pulse duration of seed laser has increased, can increase the average power of seed laser, suppress ASE, but may cause the output pulse width that amplifies back laser also greatly to increase, thereby do not meet of the requirement of high power narrow pulse fiber laser, make the application of laser be subjected to very big restriction the output laser pulse width.
In order to solve the problem that in the optical fiber amplification process, produces ASE in the prior art, the invention provides inhibition method and the device of ASE in a kind of high power narrow pulse fiber laser, below in conjunction with accompanying drawing and embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, does not limit the present invention.
Method embodiment
According to embodiments of the invention, the inhibition method of ASE in a kind of high power narrow pulse fiber laser is provided, Fig. 3 is the flow chart of the inhibition method of ASE in the high power narrow pulse fiber laser of the embodiment of the invention, as shown in Figure 3, the inhibition method according to ASE in the high power narrow pulse fiber laser of the embodiment of the invention comprises following processing:
Step 301, output characteristic requirement according to the output laser of high power narrow pulse fiber laser, the repetition rate of the seed laser that sends by pulse driving power modulation single mode laser diode seed source, and the output waveform of seed laser is modulated to two order super shape; Wherein, output characteristic requires to comprise: average power, repetition rate and pulse duration.
Step 302, the normal high power narrow pulse fiber laser of opening, make the average power of the output laser of high power narrow pulse fiber laser satisfy the output characteristic requirement, and use photodetector and oscilloscope to survey the pulse duration of the output laser of high power narrow pulse fiber laser;
Step 303 does not satisfy under the situation that output characteristic requires in the pulse duration of determine surveying, and the pulse duration of the seed laser that sends by pulse driving power modulation single mode laser diode seed source makes the pulse duration of output laser satisfy the output characteristic requirement.
Step 303 specifically comprises following processing:
Step 1, establish output characteristic require in pulse duration for being less than or equal to X nanosecond, then the pulse width modulation of the seed laser that the single mode laser diode seed source is sent by pulse driving power is nX nanosecond, wherein, n is a positive integer;
Step 2, the pulse duration of surveying at seed laser by photodetector and oscilloscope is that nX is during nanosecond, whether the pulse duration of output laser is less than or equal to X nanosecond, if the judgment is Yes, the pulse duration of then determining seed laser this moment is final pulse duration, if the judgment is No, then continue modulation by pulse driving power, the pulse duration of the seed laser that minimizing single mode laser diode seed source sends, and survey the pulse duration of output laser after the pulse duration that reduces seed laser by photodetector and oscilloscope, and the pulse duration of exporting laser be less than or equal to X during nanosecond the pulse duration of pairing seed laser be set to final pulse duration.
Preferably, n equals 3; In step 2, specifically comprise following processing: by the modulation of pulse driving power, from nX nanosecond, the pulse duration of the seed laser that the single mode laser diode seed source is sent is each to reduce by 1 nanosecond, and survey the pulse duration of every this output laser when reducing by 1 nanosecond of the pulse duration of seed laser by photodetector and oscilloscope, the pulse duration of output laser be less than or equal to X during nanosecond the pulse duration of pairing seed laser be set to final pulse duration.
That is to say, in embodiments of the present invention, the output waveform of the seed laser that sends by pulse driving power modulation single mode laser diode seed source at first, making output waveform is two order super shape.Normally open high power narrow pulse fiber laser then, satisfy under the condition of instructions for use, use photodetector and oscilloscope to survey the pulse duration of output laser in the average power of exporting laser.If it is less than x nanosecond that the pulse duration of high power narrow pulse fiber laser output laser requires, the pulse duration of the seed laser that sends by pulse driving power modulation single mode laser diode seed source then, be modulated to 3x nanosecond earlier, observation corresponding high power narrow pulse fiber laser this moment is exported the pulse duration of laser, whether satisfies the requirement less than x nanosecond.If do not meet the demands, then reduce the pulse duration of seed laser, from 3x nanosecond, reduce by 1 nanosecond at every turn, and observe the pulse duration of high power narrow pulse fiber laser output laser simultaneously, until the requirement of first fit less than x nanosecond.The pulse duration of the seed laser that this moment is corresponding is the final pulse duration that the seed laser modulation should be become.
Be that example is specifically described with high power burst pulse Yb-doped double-cladding fiber laser below.Fig. 4 is the structural representation of the high power burst pulse Yb-doped double-cladding fiber laser of the embodiment of the invention, as shown in Figure 4, this high power narrow pulse fiber laser adopts the laser diode of burst pulse electrical modulation as seed source (Seed), connects two-stage fiber amplifier structure (Pre-Amplifier and Power Amplifier) thereafter.The output characteristic of this fiber laser output laser requires to be average power 50W, repetition rate 100kHz, pulse duration≤20ns.
The laser diode seed source adopts pulse driving power to drive, and can directly modulate the output parameter of seed laser by adjusting its drive current, as repetition rate, pulse duration, impulse waveform and watt level.
At first the repetition rate of the seed laser that sends by pulse driving power modulation single mode laser diode seed source is modulated to 100kHz.The output waveform of seed laser is modulated to two order super shape.Normally open high power narrow pulse fiber laser then, make the average power of output laser reach 50W.At this moment, use photodetector and oscilloscope to survey the pulse duration of output laser.It is less than 20ns that the pulse duration of this high power narrow pulse fiber laser output laser requires, the pulse duration of the seed laser that sends by pulse driving power modulation single mode laser diode seed source then, be modulated to 60ns earlier, observation corresponding high power narrow pulse fiber laser this moment is exported the pulse duration of laser, does not satisfy the requirement less than 20ns.Next reduce the pulse duration of seed laser, from 60ns, reduce 1ns at every turn, and observe the pulse duration of high power narrow pulse fiber laser output laser simultaneously, when its first fit during less than the requiring of 20ns, the pulse duration of seed laser is 45ns.
With the pulse width modulation of seed laser is 45ns, rather than the final 20ns that requires.This be because, through the amplification process of follow-up two-stage fiber amplifier, narrow phenomenon has taken place to press in the pulse duration of seed laser, when laser power reaches 50W after amplifying, pulse duration can be pressed narrow to 20ns, thereby satisfies the output pulse width requirement of this fiber laser.Like this,, increase by 1.25 times when its average power just can be made as 20ns than pulse duration, improved the average power of seed laser, reach the purpose that effective inhibition ASE produces because the pulse duration of seed laser can be relaxed to 45ns.
In sum, by means of the technical scheme of the embodiment of the invention, the impulse waveform of the seed laser that sends by accurate control seed source guarantees that the pulse duration of seed laser can significantly be pressed narrow in the optical fiber amplification process.Like this, even the pulse duration broad of seed laser can guarantee that still the laser of the final output of fiber laser satisfies the application requirements of narrow pulsewidth.Adopt this method, just can improve the average power of seed laser, reach the purpose that effective inhibition ASE produces by the pulse duration that increases the seed source seed laser.
Device embodiment
According to embodiments of the invention, the restraining device of ASE in a kind of high power narrow pulse fiber laser is provided, Fig. 5 is the structural representation of the restraining device of ASE in the high power narrow pulse fiber laser of the embodiment of the invention, as shown in Figure 5, restraining device according to ASE in the high power narrow pulse fiber laser of the embodiment of the invention comprises: first modulation module 50, detecting module 52 and second modulation module 54 below are described in detail each module of the embodiment of the invention.
Detecting module 52, be used for normally opening high power narrow pulse fiber laser, make the average power of the output laser of high power narrow pulse fiber laser satisfy the output characteristic requirement, and use photodetector and oscilloscope to survey the pulse duration of the output laser of high power narrow pulse fiber laser;
The first modulation submodule, being used for requiring pulse duration in output characteristic is to be less than or equal under the situation of X nanosecond, the pulse width modulation of the seed laser that the single mode laser diode seed source is sent by pulse driving power is nX nanosecond, and wherein, n is a positive integer; Preferably, n equals 3.
The second modulation submodule, the pulse duration that is used for surveying at seed laser by photodetector and oscilloscope is that nX is during nanosecond, whether the pulse duration of output laser is less than or equal to X nanosecond, if the judgment is Yes, the pulse duration of then determining seed laser this moment is final pulse duration, if the judgment is No, then continue modulation by pulse driving power, the pulse duration of the seed laser that minimizing single mode laser diode seed source sends, and survey the pulse duration of output laser after the pulse duration that reduces seed laser by photodetector and oscilloscope, and the pulse duration of exporting laser be less than or equal to X during nanosecond the pulse duration of pairing seed laser be set to final pulse duration.
The second modulation submodule specifically is used for:
Modulation by pulse driving power, from nX nanosecond, the pulse duration of the seed laser that the single mode laser diode seed source is sent is each to reduce by 1 nanosecond, and survey the pulse duration of every this output laser when reducing by 1 nanosecond of the pulse duration of seed laser by photodetector and oscilloscope, the pulse duration of output laser be less than or equal to X during nanosecond the pulse duration of pairing seed laser be set to final pulse duration.
In sum, the impulse waveform of the seed laser that sends by accurate control seed source, the pulse duration of guaranteeing seed laser can significantly be pressed narrow in the optical fiber amplification process, even the pulse duration broad of seed laser, can guarantee that still the laser of the final output of fiber laser satisfies the application requirements of narrow pulsewidth, solved the problem that in the optical fiber amplification process, produces ASE in the prior art, can improve the average power of seed laser by the pulse duration that increases the seed source seed laser, reach the purpose that effective inhibition ASE produces.
Intrinsic not relevant at this algorithm that provides with any certain computer, virtual system or miscellaneous equipment with demonstration.Various general-purpose systems also can be with using based on the teaching at this.According to top description, it is conspicuous constructing the desired structure of this type systematic.In addition, the present invention is not also at any certain programmed language.Should be understood that and to utilize various programming languages to realize content of the present invention described here, and the top description that language-specific is done is in order to disclose preferred forms of the present invention.
In the specification that is provided, a large amount of details have been described herein.Yet, can understand, embodiments of the invention can be put into practice under the situation of these details not having.In some instances, be not shown specifically known method, structure and technology, so that not fuzzy understanding of this description.
Similarly, be to be understood that, in order to simplify the disclosure and to help to understand one or more in each inventive aspect, in the description to exemplary embodiment of the present invention, each feature of the present invention is grouped together in single embodiment, figure or the description to it sometimes in the above.Yet the method for the disclosure should be construed to the following intention of reflection: promptly the present invention for required protection requires the more feature of feature clearly put down in writing than institute in each claim.Or rather, as following claims reflected, inventive aspect was to be less than all features of the disclosed single embodiment in front.Therefore, follow claims of embodiment and incorporate this embodiment thus clearly into, wherein each claim itself is all as independent embodiment of the present invention.
Those skilled in the art are appreciated that and can adaptively change and they are arranged in one or more equipment different with this embodiment the module in the equipment among the embodiment.Can be the module among the embodiment or unit or the synthetic module of component groups or unit or assembly, and can be divided into a plurality of submodules or subelement or sub-component to them in addition.In such feature and/or process or unit at least some are mutually repelling, and can adopt any combination to disclosed all features in this specification (comprising claim, summary and the accompanying drawing followed) and so all processes or the unit of disclosed any method or equipment make up.Unless clearly statement in addition, disclosed each feature can be by providing identical, being equal to or the alternative features of similar purpose replaces in this specification (comprising claim, summary and the accompanying drawing followed).
In addition, those skilled in the art can understand, although embodiment more described herein comprise some feature rather than further feature included among other embodiment, the combination of features of different embodiment means and is within the scope of the present invention and forms different embodiment.For example, in the following claims, the one of any of embodiment required for protection can be used with compound mode arbitrarily.
Each parts embodiment of the present invention can realize with hardware, perhaps realizes with the software module of moving on one or more processor, and perhaps the combination with them realizes.It will be understood by those of skill in the art that and to use microprocessor or digital signal processor (DSP) to realize in practice according to some or all some or repertoire of parts in the restraining device of ASE in the high power narrow pulse fiber laser of the embodiment of the invention.The present invention can also be embodied as part or all equipment or the device program (for example, computer program and computer program) that is used to carry out method as described herein.Such realization program of the present invention can be stored on the computer-readable medium, perhaps can have the form of one or more signal.Such signal can be downloaded from internet website and obtain, and perhaps provides on carrier signal, perhaps provides with any other form.
It should be noted the foregoing description the present invention will be described rather than limit the invention, and those skilled in the art can design alternative embodiment under the situation of the scope that does not break away from claims.In the claims, any reference symbol between bracket should be configured to restriction to claim.Word " comprises " not to be got rid of existence and is not listed in element or step in the claim.Being positioned at word " " before the element or " one " does not get rid of and has a plurality of such elements.The present invention can realize by means of the hardware that includes some different elements and by means of the computer of suitably programming.In having enumerated the unit claim of some devices, several in these devices can be to come imbody by same hardware branch.Any order is not represented in the use of word first, second and C grade.Can be title with these word explanations.
Claims (10)
1. the inhibition method of amplified spontaneous emission ASE in the high power narrow pulse fiber laser is characterized in that, comprising:
Output characteristic requirement according to the output laser of high power narrow pulse fiber laser, the repetition rate of the seed laser that sends by pulse driving power modulation single mode laser diode seed source, and the output waveform of described seed laser is modulated to two order super shape;
The described high power narrow pulse fiber laser of normal unlatching, make the average power of the output laser of described high power narrow pulse fiber laser satisfy described output characteristic requirement, and use photodetector and oscilloscope to survey the pulse duration of the output laser of described high power narrow pulse fiber laser;
Determining that the described pulse duration of surveying does not satisfy under the situation of described output characteristic requirement, pulse duration by described pulse driving power is modulated the described seed laser that described single mode laser diode seed source sends makes the pulse duration of described output laser satisfy described output characteristic requirement.
2. the method for claim 1 is characterized in that, described output characteristic requires to comprise: average power, repetition rate and pulse duration.
3. method as claimed in claim 2, it is characterized in that, by the pulse duration that described pulse driving power is modulated the described seed laser that described single mode laser diode seed source sends, make the pulse duration of described output laser satisfy described output characteristic and require specifically to comprise:
If pulse duration was for being less than or equal to X nanosecond described in described output characteristic required, then the pulse width modulation of the described seed laser that described single mode laser diode seed source is sent by described pulse driving power is nX nanosecond, and wherein, n is a positive integer;
The pulse duration of surveying at described seed laser by described photodetector and described oscilloscope is that nX is during nanosecond, whether the pulse duration of described output laser is less than or equal to X nanosecond, if the judgment is Yes, the pulse duration of then determining described seed laser this moment is final pulse duration, if the judgment is No, then continue modulation by described pulse driving power, reduce the pulse duration of the described seed laser that described single mode laser diode seed source sends, and survey the pulse duration of described output laser after the pulse duration that reduces described seed laser by described photodetector and described oscilloscope, and the pulse duration of described output laser be less than or equal to X during nanosecond the pulse duration of pairing seed laser be set to described final pulse duration.
4. method as claimed in claim 3 is characterized in that n equals 3.
5. as claim 3 or 4 described methods, it is characterized in that, described continuation is by the modulation of described pulse driving power, reduce the pulse duration of the described seed laser that described single mode laser diode seed source sends, and after the pulse duration by described photodetector and the described seed laser of described oscilloscope detection minimizing, the pulse duration of described output laser, and the pulse duration of described output laser be less than or equal to X during nanosecond the pulse duration of pairing seed laser be set to described final pulse duration and specifically comprise:
Modulation by described pulse driving power, from described nX nanosecond, the pulse duration of the described seed laser that described single mode laser diode seed source is sent is each to reduce by 1 nanosecond, and survey the pulse duration of every this described output laser when reducing by 1 nanosecond of the pulse duration of described seed laser by described photodetector and described oscilloscope, the pulse duration of described output laser be less than or equal to X during nanosecond the pulse duration of pairing seed laser be set to described final pulse duration.
6. the restraining device of amplified spontaneous emission ASE in the high power narrow pulse fiber laser is characterized in that, comprising:
First modulation module, be used for output characteristic requirement according to the output laser of high power narrow pulse fiber laser, the repetition rate of the seed laser that sends by pulse driving power modulation single mode laser diode seed source, and the output waveform of described seed laser is modulated to two order super shape;
Detecting module, be used for normally opening described high power narrow pulse fiber laser, make the average power of the output laser of described high power narrow pulse fiber laser satisfy described output characteristic requirement, and use photodetector and oscilloscope to survey the pulse duration of the output laser of described high power narrow pulse fiber laser;
Second modulation module, be used for determining that the described pulse duration of surveying does not satisfy under the situation of described output characteristic requirement, pulse duration by described pulse driving power is modulated the described seed laser that described single mode laser diode seed source sends makes the pulse duration of described output laser satisfy described output characteristic requirement.
7. device as claimed in claim 6 is characterized in that, described output characteristic requires to comprise: average power, repetition rate and pulse duration.
8. device as claimed in claim 7 is characterized in that, described second modulation module specifically comprises:
The first modulation submodule, being used in pulse duration described in the described output characteristic requirement is to be less than or equal under the situation of X nanosecond, the pulse width modulation of the described seed laser that described single mode laser diode seed source is sent by described pulse driving power is nX nanosecond, wherein, n is a positive integer;
The second modulation submodule, the pulse duration that is used for surveying at described seed laser by described photodetector and described oscilloscope is that nX is during nanosecond, whether the pulse duration of described output laser is less than or equal to X nanosecond, if the judgment is Yes, the pulse duration of then determining described seed laser this moment is final pulse duration, if the judgment is No, then continue modulation by described pulse driving power, reduce the pulse duration of the described seed laser that described single mode laser diode seed source sends, and survey the pulse duration of described output laser after the pulse duration that reduces described seed laser by described photodetector and described oscilloscope, and the pulse duration of described output laser be less than or equal to X during nanosecond the pulse duration of pairing seed laser be set to described final pulse duration.
9. device as claimed in claim 8 is characterized in that n equals 3.
10. install as claimed in claim 8 or 9, it is characterized in that, the described second modulation submodule specifically is used for:
Modulation by described pulse driving power, from described nX nanosecond, the pulse duration of the described seed laser that described single mode laser diode seed source is sent is each to reduce by 1 nanosecond, and survey the pulse duration of every this described output laser when reducing by 1 nanosecond of the pulse duration of described seed laser by described photodetector and described oscilloscope, the pulse duration of described output laser be less than or equal to X during nanosecond the pulse duration of pairing seed laser be set to described final pulse duration.
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| CN201310120539.6A CN103219640B (en) | 2013-04-09 | 2013-04-09 | Method and device for restraining ASE (Amplified Spontaneous Emission) in high-power narrow-pulse optical fiber laser |
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