CN104852266A - Intracavity-frequency-multiplication-optic-parameter-oscillator-based femto-second near-infrared laser light source and method - Google Patents
Intracavity-frequency-multiplication-optic-parameter-oscillator-based femto-second near-infrared laser light source and method Download PDFInfo
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Abstract
The invention discloses an intracavity-frequency-multiplication-optic-parameter-oscillator-based femto-second near-infrared laser light source and a method. The light source comprises an all-solid-state femto-second mode-locking Yb laser, an isolator, a half-wave plate, a focusing lens, a first concave mirror, a first PPLN crystal, a second concave mirror, a three concave mirror, a second PPLN crystal, a fourth concave mirror, and an output coupling mirror, wherein the units are successive placed. According to the invention, advantages of high output power, compact structure, and low cost of the all-solid-state femto-second mode-locking Yb laser are used for realizing coherent femto-second near-infrared laser with continuous tunable wavelengths from 1.4 to 1.8 microns and 0.7 to 0.9 microns. Compared with the traditional mode-locking-titanium-sapphire laser generating a near-infrared laser light source with the wavelength from 0.7 to 0.9 microns, the provided intracavity-frequency-multiplication-optic-parameter-oscillator-based femto-second near-infrared laser light source has advantages of simple structure, stable performance, and low price and the like.
Description
Technical field
The invention belongs to technical field of ultrafast laser, particularly relate to a kind of based on intracavity frequency doubling optical parametric oscillator femtosecond near-infrared laser light source and method.
Background technology
The research of generation experience decades of femto-second laser pulse, people have successfully utilized the principles such as kerr lens mode locking (KLM), SESAM passive mode locking in many kinds of gain medias, obtain near-infrared femtosecond pulse from visible ray to about 2 μm.There is provided for the laser of laser gain relative to utilizing population inversion, femtosecond optical parametric oscillator (OPO) utilizes in nonlinear optical medium (as BBO, KTP and periodically poled lithium niobate etc.) principle that intercouples of pump light, flashlight and idle light energy to be to produce ultrashort laser pulse, thus there is unique advantage: first, adopt the femtosecond OPO of synchronous pump mode pumping, utilize same crystal, same femtosecond pumping source, the femtosecond pulse that simultaneously can produce multi-wavelength exports; Secondly, femtosecond OPO have from visible ray to infrared tuning range, greatly extend the output wavelength scope of the laser based on locked mode principle, and its wavelength is continuously-tuning; In addition, because parametric interaction has very wide parametric bandwidth, be not limited to atom or molecular energy level bandwidth, the pulse narrower than pump light can be obtained theoretically and export.Along with the maturation of Ti∶Sapphire laser KLM mode-locking technique, the femtosecond OPO being pumping source with femto second titanium sapphire oscillators obtains development at full speed, in succession reports the femtosecond OPO utilizing different gains medium, fundamental frequency and the pumping of frequency multiplication Ti∶Sapphire laser both at home and abroad.The domestic femtosecond OPO utilizing femto second titanium sapphire oscillators to realize synchronous pump is first at 2007 (document 1.J.Zhu et al.Chin.Phys.Lett.24 (9) 2603 (2007)), in succession achieves again dual wavelength femtosecond OPO (document 2.L.Xuet al.Opt.Lett.37 (9) 1436 (2012)) and the intracavity frequency doubling femtosecond OPO (document 3.J.Zhu et al.ChinPhys.B 22 (5) 054210) of high-power Ti∶Sapphire laser pumping subsequently.Although utilize ti sapphire laser pumping femtosecond OPO to have the advantage such as working stability, good beam quality, but because Ti∶Sapphire oscillator needs expensive 532nm laser as pumping source, therefore whole system cost is very high, limits the investigation and application in many popular industries.Therefore the pumping source of cheap laser diode-pumped all solid state locked mode femtosecond Yb laser as femtosecond OPO is developed, greatly can save cost on the one hand, on the other hand femtosecond Yb laser can export higher average power, thus can obtain more high-power closely tunable-mid-infrared laser.Therefore set up and a kind ofly utilize all solid state locked mode femtosecond Yb laser have great importance as the synchronous pump Femtosecond OPO of pumping source and be worth.In addition, the near-infrared ultrafast laser light source of 0.7-0.9 μm is at many key areas as bio-photon, and the fields such as light microscope and non-Stokes Raman spectral measurement have important application.The near-infrared ultrashort laser light source of 0.7-0.9 μm of current main flow is exactly Ti∶Sapphire laser femtosecond mode-locked laser, as previously mentioned, although there is various advantage in Ti∶Sapphire laser femtosecond mode-locked laser, but need expensive 532nm laser as pumping source, therefore whole system cost is very high, and be no matter the pumping source of 532nm or ti sapphire laser all needs to carry out water-cooled, it is comparatively large, compact not that this just determines its volume ratio.Therefore, propose a kind of low cost, the simple 0.7-0.9 of structure μm of ultrafast mid-infrared laser light source is imperative.
Summary of the invention
The object of the present invention is to provide a kind of based on intracavity frequency doubling optical parametric oscillator femtosecond near-infrared laser light source and method, be intended to solve that the structure that existing near-infrared femto-second laser exists is not compact, price is higher, wavelength can not continuously adjustable problem.
The present invention realizes like this, a kind of based on intracavity frequency doubling optical parametric oscillator femtosecond near-infrared laser light source, describedly comprise all solid state femtosecond locked mode Yb laser, isolator, half-wave plate, condenser lens, the first concave mirror, a PPLN crystal, the second concave mirror, the 3rd concave mirror, the 2nd PPLN crystal, the 4th concave mirror and the output coupling mirror placed successively based on intracavity frequency doubling optical parametric oscillator femtosecond near-infrared laser light source;
Described all solid state femtosecond locked mode Yb laser, for generation of the pumping laser of femto-second pulse duration;
Described isolator, for isolating the part mode-locked laser returned from parametric oscillator, avoiding return laser light to disturb Yb oscillator mode-lock status, avoiding return laser light to disturb Yb oscillator mode-lock status;
Described half-wave plate, for adjusting the polarization state of pumping mode-locked laser, realizes the phase matched of pump light, flashlight and idle light, changes the polarization direction of pumping laser;
Described condenser lens, for focusing on a PPLN crystal by pumping mode-locked laser;
Described first concave mirror and the second concave mirror, for the formation of confocal tight focusing lumen type;
A described PPLN crystal, between the first concave mirror and the second concave mirror, for realizing high efficiency parametric oscillation and wavelength tuning;
Described 3rd concave mirror and the 4th concave mirror, for the formation of confocal arrangement, to reduce the spot size on the 2nd PPLN crystal, wherein the 4th concave mirror also plays and returns reflection parameter signals light by former road, for forming an end mirror in parametric reasonance chamber and exporting the effect of whole frequency doubled lights;
Described 2nd PPLN crystal, between the 3rd concave mirror and the 4th concave mirror, for realizing efficient frequency doubling and wavelength tuning;
Described outgoing mirror, for being placed on an one-dimensional precise translation stage by output signal light.
Further, described all solid state femtosecond locked mode Yb laser is the semiconductor saturable absorbing mirror passive mode locking femtosecond oscillator of the Yb doping gain media of LD pumping, centre wavelength is near 1 μm, the output average power of pumping laser is greater than 500mW, and pulse duration is less than 300fs, repetition rate is about 80MHz.
Further, described condenser lens two sides is coated with the anti-reflection deielectric-coating of pumping laser wavelength, and focal length is 100mm or 75mm.
Further, the one side of described first concave mirror and the second concave mirror is coated with the anti-reflection film of 1000nm ~ 1100nm, and another side is coated with the high-reflecting film of 1400nm ~ 1800nm, and radius of curvature is R=100mm.
Further, a described PPLN crystal is the periodically poled lithium niobate crystal of doping 5%MgO, logical optical cross-section is 1mm × 8mm, logical light length is 1mm, there are seven polarization cycles, be respectively 28/28.5,29/29.5/30/30.5/31m, the length of every polarization cycle is 1mm, be spaced apart 0.2mm between two polarization cycles, and respectively there is the non-polarized area of 0.1mm at crystal two ends; Crystal two leads to light face and is coated with anti-reflection film to 1000nm ~ 1100nm/1400nm ~ 1900nm/2300nm ~ 4000nm respectively.
Further, the one side of described 3rd concave mirror and the 4th concave mirror is coated with the anti-reflection film of 700nm ~ 900nm, and another side is coated with the high-reflecting film of 1400nm ~ 1800nm, and radius of curvature is R=100mm;
Described 2nd PPLN crystal is the periodically poled lithium niobate crystal of doping 5%MgO, logical optical cross-section is 1mm × 6mm, logical light length is 1mm, there are five polarization cycles, be respectively 19.5/19.7/19.9/20.1/20.3m, the length of every polarization cycle is 1mm, be spaced apart 0.2mm between two polarization cycles, and respectively there is the non-polarized area of 0.1mm at two ends; Two logical light faces are coated with the anti-reflection film to 700nm ~ 900nm/1400nm ~ 1900nm respectively;
Described outgoing mirror is coated with towards the one side in resonant cavity has at flashlight wave band the deielectric-coating exporting coupling efficiency, and another side is coated with the anti-reflection deielectric-coating of flashlight wave band.
Another object of the present invention is to provide a kind of utilization to produce the method for femtosecond near-infrared laser based on intracavity frequency doubling optical parametric oscillator femtosecond near-infrared laser light source, the method for described generation femtosecond near-infrared laser comprises:
All solid state femtosecond locked mode Yb laser produces the pumping laser of femto-second pulse duration, and after optical isolator and half-wave plate, line focus lens focus enters in a PPLN crystal;
First concave mirror, the second concave mirror, the 3rd concave mirror, the 4th concave mirror and outgoing mirror form parametric oscillation resonant cavity; The center that 2nd PPLN crystal is placed in the confocal arrangement of the 3rd concave mirror and the formation of the 4th concave mirror produces intracavity frequency doubling; First concave mirror and the second concave mirror form confocal tight focusing lumen type, and the beam waist of the flashlight beam waist on a PPLN crystal and pump light is matched;
3rd concave mirror and the 4th concave mirror form another confocal arrangement to reduce the flashlight spot size on the 2nd PPLN crystal, obtain high efficiency intracavity frequency doubling, and the frequency doubled light of generation is all exported by the 4th concave mirror;
Outgoing mirror exports a part of flashlight, and to return to the chamber simultaneously realizing parametric reasonance chamber long tuning on another part flashlight former road.
Another object of the present invention is to provide a kind of and utilize the described laser radar based on intracavity frequency doubling optical parametric oscillator femtosecond near-infrared laser light source.
Another object of the present invention is to provide a kind of and utilize the described ultrafast optical communication based on intracavity frequency doubling optical parametric oscillator femtosecond near-infrared laser light source.
Another object of the present invention is to provide a kind of and utilize the described Ultrafast spectrum based on intracavity frequency doubling optical parametric oscillator femtosecond near-infrared laser light source.
Provided by the invention based on intracavity frequency doubling optical parametric oscillator femtosecond near-infrared laser light source and method, utilize the advantage that all solid state locked mode femtosecond Yb laser output power is large, compact conformation, cost are low, the relevant femtosecond near-infrared laser of wavelength at 1.4-1.8 μm (flashlight) and 0.7-0.9 μm of (frequency doubled light) continuously adjustable can be realized easily; Compared to traditional near-infrared laser light source producing 0.7-0.9 μm based on locked mode ti sapphire laser.Femtosecond near-infrared laser source based on intracavity frequency doubling optical parametric oscillator provided by the invention has that structure is simple, stable performance, the advantage such as cheap, preferably resolve that the structure that existing femto-second laser exists is not compact, price is higher, wavelength can not continuously adjustable problem.
Accompanying drawing explanation
Fig. 1 be the embodiment of the present invention provide based on intracavity frequency doubling optical parametric oscillator femtosecond near-infrared laser light-source structure schematic diagram;
Fig. 2 is the tuning schematic diagram of signal light wavelength that the embodiment of the present invention provides;
Fig. 3 is the schematic diagram of the relation of the signal light power that provides of the embodiment of the present invention and wavelength;
Fig. 4 is the schematic diagram of the frequency doubled light wavelength tuning that the embodiment of the present invention provides;
Fig. 5 is the schematic diagram of the output signal light impulse length that employing intensity autocorrelation function analyzer that the embodiment of the present invention provides records;
Fig. 6 is the schematic diagram of the output frequency doubling light pulse width that employing intensity autocorrelation function analyzer that the embodiment of the present invention provides records;
In figure: 1, all solid state femtosecond locked mode Yb laser; 2, isolator; 3, half-wave plate; 4, condenser lens; 5, the first concave mirror; 6, a PPLN crystal; 7, the second concave mirror; 8, the 3rd concave mirror; 9, the 2nd PPLN crystal; 10, the 4th concave mirror; 11, output coupling mirror.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Of the present invention based on intracavity frequency doubling optical parametric oscillator generation femtosecond near-infrared laser light source, can output wavelength at the relevant femtosecond near-infrared laser of 1.4 μm ~ 1.8 μm and 0.7 μm ~ 0.9 μm of continuously adjustable, this femtosecond light source has important potential application in fields such as laser radar, bio-imaging, Ultrafast spectrum, ultrafast optical communications.
Below in conjunction with accompanying drawing 1, application principle of the present invention is explained in detail.
As shown in Figure 1, the embodiment of the present invention based on intracavity frequency doubling optical parametric oscillator femtosecond near-infrared laser light source primarily of: all solid state femtosecond locked mode Yb laser 1, isolator 2, half-wave plate 3, condenser lens 4, first concave mirror 5, PPLN crystal 6, second concave mirror 7, the 3rd concave mirror 8, the 2nd PPLN crystal 9, the 4th concave mirror 10 and output coupling mirror 11 form.
All solid state femtosecond locked mode Yb laser 1, it is semiconductor saturable absorbing mirror (SESAM) the passive mode locking femtosecond oscillator of the Yb doping gain media of a LD pumping, centre wavelength is near 1 μm, according to the difference of Yb gain media, centre wavelength is different, the output average power of pumping laser is greater than 500mW, and pulse duration is less than 300fs, repetition rate is about 80MHz.
Isolator 2, for isolating the part mode-locked laser returned from parametric oscillator, avoids return laser light to disturb Yb oscillator mode-lock status.
Half-wave plate 3, for adjusting the polarization state of pumping mode-locked laser, to realize the phase matched of pump light, flashlight and idle light.
Condenser lens 4, for pumping mode-locked laser is focused on a PPLN crystal, lens two sides is coated with the anti-reflection deielectric-coating of pumping laser wavelength, and focal length is 100mm or 75mm.
First concave mirror 5 and the second concave mirror 7, for the formation of confocal tight focusing lumen type, makes the beam waist of the flashlight beam waist on a PPLN crystal and pump light match, realizes high parameter transform efficiency; Two concave mirrors all plate the anti-reflection film (R<3%) of 1000nm ~ 1100nm and the high-reflecting film to 1400nm ~ 1800nm (R>99.8%), and radius of curvature is R=100mm.
One PPLN crystal 6, for the periodically poled lithium niobate crystal of the 5%MgO that adulterates, it is 1mm × 8mm that crystal leads to optical cross-section, logical light length is 1mm, seven polarization cycles are had above crystal, be respectively 28/28.5/29.5/30/30.5/31m, the length of every polarization cycle is 1mm, be spaced apart 0.2mm between two polarization cycles, respectively there is the non-polarized area of 0.1mm at crystal two ends; Crystal two leads to light face and is coated with anti-reflection film to 1000nm ~ 1100nm (R<1%)/1400nm ~ 1900nm (R<1%)/2300nm ~ 4000nm (R<10%) respectively.Crystal is placed on one five dimension translation stage, can finely tune azimuth and position, XYZ direction, realize high efficiency parametric oscillation and wavelength tuning.
3rd concave mirror 8 and the 4th concave mirror 10, for the formation of confocal arrangement, make the flashlight on the 2nd PPLN crystal with a tight waist as far as possible little, realize high intracavity frequency doubling efficiency.Two concave mirrors are all coated with the anti-reflection film (R<3%) of 700nm ~ 900nm and the high-reflecting film to 1400nm ~ 1800nm (R>99.8%), and radius of curvature is R=100mm.
2nd PPLN crystal 9, it is the periodically poled lithium niobate crystal of one piece of doping 5%MgO, it is 1mm × 6mm that crystal leads to optical cross-section, logical light length is 1mm, five polarization cycles are had above crystal, be respectively 19.5/19.7/19.9/20.1/20.3m, the length of every polarization cycle is 1mm, be spaced apart 0.2mm between two polarization cycles, respectively there is the non-polarized area of 0.1mm at crystal two ends; Crystal two leads to light face and is coated with anti-reflection film to 700nm ~ 900nm (R<1%)/1400nm ~ 1900nm (R<1%) respectively; Crystal is placed on one five dimension translation stage, can finely tune azimuth and position, XYZ direction, realize efficient frequency doubling and wavelength tuning.
The output rating of outgoing mirror 11,1220nm ~ 1750nm is 2%, is placed on above an one-dimensional precise translation stage for outputing signal light, and the chamber that accurately can change parametric reasonance chamber is long, realizes the cavity length matching with Yb resonant cavity.
Below in conjunction with specific embodiment, application principle of the present invention is further described.
Specific embodiments of the invention:
In FIG, all solid state femtosecond locked mode Yb laser 1, for generation of the pumping laser of femto-second pulse duration, after optical isolator 2 and half-wave plate 3, line focus lens 4 focus on and enter in a PPLN crystal 6; First concave mirror 5, second concave mirror 7, the 3rd concave mirror 8, the 4th concave mirror 10 and outgoing mirror 11 form parametric oscillation resonant cavity; 2nd PPLN crystal 9 is placed in the center of the confocal arrangement of the 3rd concave mirror 8 and the formation of the 4th concave mirror 10 for generation of intracavity frequency doubling; Wherein the first concave mirror 5 and the second concave mirror 7 form confocal tight focusing lumen type, and the beam waist of the flashlight beam waist on a PPLN crystal 6 and pump light is matched; 3rd concave mirror 8 and the 4th concave mirror 10 form another confocal arrangement to reduce the flashlight spot size on the 2nd PPLN crystal 9, obtain high efficiency intracavity frequency doubling, and the frequency doubled light of generation is all exported by the 4th concave mirror 10; Outgoing mirror 11 exports a part of flashlight, and the chamber that can realize parametric reasonance chamber while that the former road of another part flashlight returning is long tuning; Meet phase matched, cavity length matching, stable cavity condition and reach flashlight oscillation threshold condition under, this optical parametric oscillator can realize steady operation, flashlight is propagated at parametric reasonance intracavity round trip, and coupling output part flashlight energy during each arrival output coupling mirror 11, produce frequency doubled light when arriving the 2nd PPLN crystal 9, export from the 4th concave mirror 10.
According to the physical principle of the femtosecond OPO of synchronous pump, can the wavelength of harmonic ringing light by the following method: the wavelength 1, changing pump light; 2, the polarization cycle of PPLN crystal is changed; 3, the temperature of PPLN crystal is changed; 4, the chamber changing OPO resonant cavity is long.By above step, the relevant femtosecond near-infrared laser output that flashlight operates at 1.4-1.8m continuously adjustable can be realized, while obtaining tunable signal light, the polarization cycle of corresponding change the 2nd PPLN crystal 9 or temperature, the relevant femtosecond near-infrared laser that simultaneously can obtain corresponding 0.7-0.9um continuously adjustable exports.
The gain medium of all solid state femtosecond locked mode Yb laser is Yb:LYSO crystal, and output average power is 2W, pulse duration 300fs, and centre wavelength is 1042nm, and repetition rate is * * MHz.
The present invention, by regulating the chamber of OPO resonant cavity long, obtains flashlight 1428nm ~ 1763nm, the tuning range of frequency doubled light 767nm ~ 874nm; Flashlight spectral tuning curve as shown in Figure 2.Power output does not coexist between 100mW ~ 400mW with signal light wavelength, as shown in Figure 3; The tuning curve of frequency doubled light as shown in Figure 4; The flashlight utilizing commercial intensity autocorrelation function analyzer to record and frequency doubled light exemplary pulse widths be respectively 465fs and 313fs, as shown in Figure 5 and Figure 6, corresponding flashlight and the wavelength of frequency doubled light are at 1511nm and 792nm.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. one kind based on intracavity frequency doubling optical parametric oscillator femtosecond near-infrared laser light source, it is characterized in that, describedly comprise all solid state femtosecond locked mode Yb laser, isolator, half-wave plate, condenser lens, the first concave mirror, a PPLN crystal, the second concave mirror, the 3rd concave mirror, the 2nd PPLN crystal, the 4th concave mirror and the output coupling mirror placed successively based on intracavity frequency doubling optical parametric oscillator femtosecond near-infrared laser light source;
Described all solid state femtosecond locked mode Yb laser, for generation of the pumping laser of femto-second pulse duration;
Described isolator, for isolating the part mode-locked laser returned from parametric oscillator, avoids return laser light to disturb Yb oscillator mode-lock status;
Described half-wave plate, for adjusting the polarization state of pumping mode-locked laser, realizes the phase matched of pump light, flashlight and idle light;
Described condenser lens, for focusing on a PPLN crystal by pumping mode-locked laser;
Described first concave mirror and the second concave mirror, for the formation of confocal tight focusing lumen type;
A described PPLN crystal, is placed in the middle of the first concave mirror and the second concave mirror, for realizing high efficiency parametric oscillation and wavelength tuning;
Described 3rd concave mirror and the 4th concave mirror, for the formation of confocal arrangement;
Described 2nd PPLN crystal, is placed in the middle of the 3rd concave mirror and the 4th concave mirror, for realizing efficient frequency doubling and wavelength tuning;
Described outgoing mirror, for being placed on an one-dimensional precise translation stage by output signal light.
2. as claimed in claim 1 based on intracavity frequency doubling optical parametric oscillator femtosecond near-infrared laser light source, it is characterized in that, described all solid state femtosecond locked mode Yb laser is the semiconductor saturable absorbing mirror passive mode locking femtosecond oscillator of the Yb doping gain media of LD pumping, centre wavelength is near 1 μm, the output average power of pumping laser is greater than 500mW, and pulse duration is less than 300fs, repetition rate is 80MHz.
3. as claimed in claim 1 based on intracavity frequency doubling optical parametric oscillator femtosecond near-infrared laser light source, it is characterized in that, described condenser lens two sides is coated with the anti-reflection deielectric-coating of pumping laser wavelength, and focal length is 100mm or 75mm.
4. as claimed in claim 1 based on intracavity frequency doubling optical parametric oscillator femtosecond near-infrared laser light source, it is characterized in that, the one side of described first concave mirror and the second concave mirror is coated with the anti-reflection film of 1000nm ~ 1100nm, another side is coated with the high-reflecting film of 1400nm ~ 1800nm, and radius of curvature is R=100mm.
5. as claimed in claim 1 based on intracavity frequency doubling optical parametric oscillator femtosecond near-infrared laser light source, it is characterized in that, a described PPLN crystal is the periodically poled lithium niobate crystal of doping 5%MgO, logical optical cross-section is 1mm × 8mm, logical light length is 1mm, has seven polarization cycles, is respectively 28/28.5/29/29.5/30/30.5/31m, the length of every polarization cycle is 1mm, be spaced apart 0.2mm between two polarization cycles, and respectively there is the non-polarized area of 0.1mm at crystal two ends; Crystal two leads to light face and is coated with anti-reflection film to 1000nm ~ 1100nm/1400nm ~ 1900nm/2300nm ~ 4000nm respectively.
6. as claimed in claim 1 based on intracavity frequency doubling optical parametric oscillator femtosecond near-infrared laser light source, it is characterized in that, the one side of described 3rd concave mirror and the 4th concave mirror is coated with the anti-reflection film of 700nm ~ 900nm, another side is coated with the high-reflecting film of 1400nm ~ 1800nm, and radius of curvature is R=100mm;
Described 2nd PPLN crystal is the periodically poled lithium niobate crystal of doping 5%MgO, logical optical cross-section is 1mm × 6mm, logical light length is 1mm, there are five polarization cycles, be respectively 19.5/19.7/19.9/20.1/20.3m, the length of every polarization cycle is 1mm, be spaced apart 0.2mm between two polarization cycles, and respectively there is the non-polarized area of 0.1mm at two ends; Two logical light faces are coated with the anti-reflection film to 700nm ~ 900nm/1400nm ~ 1900nm respectively;
Described outgoing mirror is coated with towards the one side in resonant cavity has at flashlight wave band the deielectric-coating exporting coupling efficiency, and another side is coated with the anti-reflection deielectric-coating of flashlight wave band.
7. utilize the method producing femtosecond near-infrared laser based on intracavity frequency doubling optical parametric oscillator femtosecond near-infrared laser light source, it is characterized in that, the method for described generation femtosecond near-infrared laser comprises:
All solid state femtosecond locked mode Yb laser produces the pumping laser of femto-second pulse duration, and after optical isolator and half-wave plate, line focus lens focus enters in a PPLN crystal;
First concave mirror, the second concave mirror, the 3rd concave mirror, the 4th concave mirror and outgoing mirror form parametric oscillation resonant cavity; The center that 2nd PPLN crystal is placed in the confocal arrangement of the 3rd concave mirror and the formation of the 4th concave mirror produces intracavity frequency doubling; First concave mirror and the second concave mirror form confocal tight focusing lumen type, and the beam waist of the flashlight beam waist on a PPLN crystal and pump light is matched;
3rd concave mirror and the 4th concave mirror form another confocal arrangement to reduce the flashlight spot size on the 2nd PPLN crystal, obtain high efficiency intracavity frequency doubling, and the frequency doubled light of generation is all exported by the 4th concave mirror;
Outgoing mirror exports a part of flashlight, and to return to the chamber simultaneously realizing parametric reasonance chamber long tuning on another part flashlight former road.
8. one kind utilizes the laser radar based on intracavity frequency doubling optical parametric oscillator femtosecond near-infrared laser light source described in claim 1-7 any one.
9. one kind utilizes the ultrafast optical communication based on intracavity frequency doubling optical parametric oscillator femtosecond near-infrared laser light source described in claim 1-7 any one.
10. one kind utilizes the Ultrafast spectrum based on intracavity frequency doubling optical parametric oscillator femtosecond near-infrared laser light source described in claim 1-7 any one.
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| CN107104361A (en) * | 2017-06-19 | 2017-08-29 | 中科和光（天津）应用激光技术研究所有限公司 | A kind of miniaturization blue laser of semiconductor laser direct frequency doubling |
| CN107104361B (en) * | 2017-06-19 | 2023-05-05 | 中科和光（天津）应用激光技术研究所有限公司 | Miniaturized blue laser with direct frequency multiplication of semiconductor laser |
| CN107490461A (en) * | 2017-07-14 | 2017-12-19 | 中国航发沈阳发动机研究所 | Periodically adjustable frequency-doubled signal generation method |
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| CN111697425A (en) * | 2020-06-05 | 2020-09-22 | 中国科学院苏州生物医学工程技术研究所 | Human eye safety wave band cascade frequency doubling optical parametric oscillator |
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