CN102692749B - A kind of apparatus and method intercepting hot spot - Google Patents
A kind of apparatus and method intercepting hot spot Download PDFInfo
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- CN102692749B CN102692749B CN201210177127.1A CN201210177127A CN102692749B CN 102692749 B CN102692749 B CN 102692749B CN 201210177127 A CN201210177127 A CN 201210177127A CN 102692749 B CN102692749 B CN 102692749B
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- hot spot
- intercepting
- light modulator
- lcd space
- gray level
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Abstract
The invention provides a kind of device intercepting hot spot, comprise occulter, have optical transmission window in described occulter, the edge of described optical transmission window has transitional zone, and in this transitional zone, the transmitance of light is become not saturating gradually from full impregnated.Present invention also offers the corresponding method intercepting hot spot.Compared with prior art, the present invention can avoid hot spot to occur inner modulation.
Description
Technical field
The present invention relates to laser technology field, specifically, the present invention relates to a kind of apparatus and method intercepting hot spot.
Background technology
In prior art, in laser optical path, the general diaphragm that uses intercepts hot spot, thus limits the light spot shape propagated in subsequent optical path.Existing diaphragm generally adopts metal material to make, and typical mechanism of diaphragm as shown in Figure 1, determine as required, such as rectangle or circle etc. by its hole shape.But, when adopting existing diaphragm to intercept hot spot, there is following shortcoming:
1, hot spot is after diaphragm, and inside there will be modulation, have impact on beam quality (as shown in Figure 2).
If 2 want the shape, the size that adjust diaphragm, only have the diaphragm more renewed, it is very inconvenient to operate.
Therefore, current in the urgent need to a kind of apparatus and method hot spot can avoided to occur inner modulation, be convenient to adjust the shape of hot spot, the intercepting hot spot of size.
Summary of the invention
The object of this invention is to provide a kind of apparatus and method hot spot can avoided to occur inner modulation, be convenient to adjust the shape of hot spot, the intercepting hot spot of size.
According to an aspect of the present invention, the invention provides a kind of device intercepting hot spot, comprise occulter, there is in described occulter optical transmission window (also can be described as light transmissive aperture), the edge of described optical transmission window has transitional zone, and in this transitional zone, the transmitance of light is become not saturating gradually from full impregnated.
Wherein, the device of described intercepting hot spot comprises LCD space light modulator, and described optical transmission window realizes by writing gray level image in described LCD space light modulator.
Wherein, the device of described intercepting hot spot also comprises the polarizer set gradually along light path, left-handed 45 ° of rotors, dextrorotation 45 ° of rotors and analyzer, described LCD space light modulator is arranged between left-handed 45 ° of rotors and dextrorotation 45 ° of rotors, the described polarizer and the orthogonal thereto placement of analyzer.
Wherein, the device of described intercepting hot spot also comprises the polarizer set gradually along light path, two 1/2nd slides and analyzers, described LCD space light modulator is arranged between two described 1/2nd slides, the described polarizer and the orthogonal thereto placement of analyzer.
Wherein, the described polarizer is polarization splitting prism or polaroid.
According to a further aspect in the invention, additionally provide a kind of method of intercepting hot spot of the device based on above-mentioned intercepting hot spot, comprise the following steps:
1) at described LCD space light modulator write gray level image, the edge of this gray level image has transitional zone, the pixel grey scale in this transitional zone gradually from maximum become minimum;
2) make light beam by described LCD space light modulator thus intercept hot spot.
Wherein, in described step 1), the shape of described gray level image is determined by light spot shape after desired intercepting.
Wherein, in described step 1), the size of described gray level image is determined by spot size after desired intercepting.
Compared with prior art, the present invention has following technique effect:
1, the present invention can avoid hot spot to occur inner modulation.
2, the present invention be convenient to adjust intercept shape, the size of hot spot.
Accompanying drawing explanation
Fig. 1 shows a kind of typical mechanism of diaphragm in prior art;
Fig. 2 shows the inner light spot image occurring modulation after existing diaphragm;
Fig. 3 shows the device of the intercepting hot spot in one embodiment of the invention;
Fig. 4 shows in one embodiment of the invention the softening square diaphragm of the band that writes LCD space light modulator;
Fig. 5 shows in one embodiment of the invention the softening circular iris of the band that writes LCD space light modulator;
Fig. 6 shows in one embodiment of the invention the softening circular iris one jiao of the band that writes LCD space light modulator;
Fig. 7 shows on the CCD in one embodiment of the invention and collects hot spot.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
Fig. 3 shows the light path of the device intercepting hot spot according to an embodiment of the invention, with reference to figure 3, the device of this intercepting hot spot comprises polarization splitting prism 1(and PolarizationCubeBeamsplitter set gradually along light path, is abbreviated as PBS), left-handed 45 ° of rotors 2, LCD space light modulator 3, dextrorotation 45 ° of rotors 4 and polarization splitting prism 5.
In the present embodiment, first PBS plays the effect (easy understand, PBS also can replace with polaroid) of the polarizer, and it makes polarisation of light state level.Left-handed 45 ° of rotors, by left-handed for the light of polarization state level 45 °, can make the long axis of liquid crystal molecule of polarisation of light state and LCD space light modulator at 45 ° like this, thus make the Modulation and Amplitude Modulation of LCD space light modulator reach maximum.The light that polarization state is left-handed 45 ° by half-twist, then makes polarization state transfer to vertically by dextrorotation 45 ° of rotors through LCD space light modulator polarization state, plays the effect of analyzer finally by the vertical polarization splitting prism 5(placed) outgoing.As can be seen from above-described embodiment, the polarising means of pair of orthogonal (namely, device is vertical with analyzer partially) before and after LCD space light modulator, to be had.Can be a pair PBS, also can be a pair polaroid.Polarising means has above been responsible for partially, horizontal state of polarization process, and polarising means is below responsible for analyzing, and perpendicular polarisation state passes through.In addition, according to another embodiment of the present invention, above-mentioned left-handed 45 ° of rotors and dextrorotation 45 ° of rotors also can replace with two 1/2nd wave plates, and incident line polarisation and the optical axis included angle of 1/2nd wave plates are 22.5 °, can play the effect making polarisation of light state rotate 45 ° equally.
LCD space light modulator can write the gray level image of various shape and size, and when the gray level image gray-scale value write on liquid crystal is 0, corresponding transmitance is 0; When gray-scale value is 255, transmitance is maximum; When gray-scale value is from 0 to 255 change, transmitance is changed from small to big.Utilize this point, the diaphragm that marginal belt is softening can be made.So-called softening, be exactly that transmitance gradually changes, directly become from full impregnated not saturating unlike traditional diaphragm edge, there is no transition.Square and the circular gray level image that the band that Fig. 4 and Fig. 5 respectively illustrates write LCD space light modulator softens.The circular gray level image one jiao that the band that Fig. 6 shows the write LCD space light modulator of amplification softens, figure can find out this circular gray level image softening process from inside to outside thus.By above-mentioned gray level image write LCD space light modulator, in lighttight shielded area, in fact just define an optical transmission window consistent with write gray level image.Further, edge's (i.e. optical transmission window and shielded area intersection) of this optical transmission window has transitional zone, and the transmitance in this transitional zone is become not saturating gradually from full impregnated, thus forms the softening diaphragm of marginal belt.
When utilizing the device of above-mentioned intercepting hot spot to intercept hot spot, first, at described LCD space light modulator write gray level image, the edge of this gray level image has transitional zone, and the pixel grey scale in this transitional zone is become minimum (namely with softening gray level image) from maximum gradually; Then make light beam by described LCD space light modulator thus intercept hot spot.Wherein, the shape of gray level image is determined by light spot shape after desired intercepting.The size of gray level image is also determined by spot size after desired intercepting.
The gray level image that band softens can be made also can be drawn by photoshop with matlab programming and form.Easily find out, utilize the device of the intercepting hot spot of above-described embodiment, the shape (such as circle, rectangle, rhombus etc.) of change diaphragm that can be quick, real-time and size, the softening degree of diaphragm also can according to circumstances be arranged flexibly.
In reality test, when writing the rectangle gray level image shown in Fig. 4 in the device of the intercepting hot spot of above-described embodiment, carry out detecting collected hot spot as shown in Figure 7 with CCD, can see that the quality of glossing up is very good, there is not inner modulation phenomenon.Inventor also finds under study for action, and when writing the rectangle gray level image without transitional zone in LCD space light modulator, it is consistent for carrying out detecting collected hot spot with Fig. 2 with CCD, namely there is inner modulation phenomenon.Can finding out, when intercepting hot spot, replacing hard-edge that it can be avoided to occur inner modulation with soft limit.
In addition, in one embodiment, need the usable area according to liquid crystal spatial light adjuster, number of pixels, spot size is converted to the gray matrix of liquid crystal spatial light adjuster.Such as, to make the square hot spot of a 10mm × 10mm, if the usable area of liquid crystal spatial light adjuster used is: 26,6mm × 20,0mm, number of pixels is: 832x624.Then 10/ (26.6/832)=313.If make hot spot with matlab, then need the gray matrix of write one 313 × 313.
In one embodiment, described LCD space light modulator directly can use the matured product on market.In another embodiment, LCD space light modulator can be made: between two panels transparent electrode substrate (transmitance is more than 90%), be filled with about 10 μm thick nematic liquid crystals by following basic producing principle, form sandwich structure, make the major axis of liquid crystal molecule that 90 ° of continuous print distortions occur between substrate, make the liquid crystal cell of twisted nematic.This LCD space light modulator principle of work is as follows: to row twisted liquid crystal (twisted-nematicliquidcrystal---TN-LC) molecular material (SonyLCX-016), arrange with nematic structure, in twisted liquid crystal element front and rear surfaces, molecule is parallel to surperficial directrix.When there being light incident, linear polarization is parallel to the directrix direction of the plane of incidence, and light retrodeviates polarization state by half-twist through light valve.When there being voltage-drop loading on TN-LC, molecular orientation changes until be parallel to extra electric field.The change of molecular orientation affects the optical thickness of polarisation of light state, element, and different voltage causes the state of TN-LC can be represented by Jones matrix, can predict polarization state and light field phase place.TN-LC is placed between two orthogonal polaroids and can be easy to realize Modulation and Amplitude Modulation.When powering up, under the effect of extra electric field, the orientation of liquid crystal molecule will change, thus the transmittance of LCD space light modulator is changed.When extra electric field strengthens, the transmittance of LCD space light modulator also increases thereupon, until when the intensity of extra electric field is greater than the threshold voltage of LCD space light modulator, the transmittance of LCD space light modulator will keep maximum transmission rate constant.The transmitance that LCD space light modulator gradation data can control LCD space light modulator is equally imported by VGA data line.Native system adopts fixed voltage 15V exactly, by VGA data line, imports the control that gray scale image realizes light valve transmitance.
In addition, although above-described embodiment all adopts LCD space light modulator to make the softening diaphragm of marginal belt, but based on description above, one skilled in the art will readily appreciate that the diaphragm that marginal belt of the present invention softens is not limited to LCD space light modulator, as long as have an occulter, optical transmission window is formed in the shielded area of this occulter, the edge of this optical transmission window has transitional zone, and the transmitance in this transitional zone is become not saturating gradually from full impregnated, can form the diaphragm that marginal belt is softening.
In addition, in above-described embodiment, the Softening factor that edge has the optical transmission window of transitional zone can be selected flexibly, such as can Binding experiment, utilizes CCD to gather hot spot, carries out choose reasonable according to gathered light spot image to Softening factor.Wherein, Softening factor is that light intensity is by the geometry spacing of full strength bore to zero intensity bore place and the ratio of light zero intensity bore.
Finally, the above embodiments are only used for the present invention is described, it should not be construed is carry out any restriction to protection scope of the present invention.And, it will be apparent to those skilled in the art that and do not departing under above-described embodiment spirit and principle, the various equivalences carried out above-described embodiment change, modification and the various improvement that do not describe in the text are all within the protection domain of this patent.
Claims (8)
1. one kind intercepts the device of hot spot, comprise occulter, have optical transmission window in described occulter, described optical transmission window edge has the transitional zone for being softened by the hard-edge of hot spot after desired intercepting, and in described transitional zone, the transmitance of light is become not saturating gradually from full impregnated.
2. the device of intercepting hot spot according to claim 1, is characterized in that, the device of described intercepting hot spot comprises LCD space light modulator, and described optical transmission window realizes by writing gray level image in described LCD space light modulator.
3. the device of intercepting hot spot according to claim 2, it is characterized in that, the device of described intercepting hot spot also comprises the polarizer set gradually along light path, left-handed 45 ° of rotors, dextrorotation 45 ° of rotors and analyzer, described LCD space light modulator is arranged between left-handed 45 ° of rotors and dextrorotation 45 ° of rotors, the described polarizer and the orthogonal thereto placement of analyzer.
4. the device of intercepting hot spot according to claim 2, it is characterized in that, the device of described intercepting hot spot also comprises the polarizer set gradually along light path, two 1/2nd slides and analyzers, described LCD space light modulator is arranged between two described 1/2nd slides, the described polarizer and the orthogonal thereto placement of analyzer.
5. the device of the intercepting hot spot according to claim 3 or 4, is characterized in that, the described polarizer is polarization splitting prism or polaroid.
6., based on a method for the intercepting hot spot of the device of intercepting hot spot according to claim 2, it is characterized in that, comprise the following steps:
1) at described LCD space light modulator write gray level image, the edge of this gray level image has transitional zone, the pixel grey scale in this transitional zone gradually from maximum become minimum;
2) make light beam by described LCD space light modulator thus intercept hot spot.
7. the method for intercepting hot spot according to claim 6, is characterized in that, described step 1) in, the shape of described gray level image is determined by light spot shape after desired intercepting.
8. the method for intercepting hot spot according to claim 6, is characterized in that, described step 1) in, the size of described gray level image is determined by spot size after desired intercepting.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210177127.1A CN102692749B (en) | 2012-05-31 | 2012-05-31 | A kind of apparatus and method intercepting hot spot |
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| CN201210177127.1A CN102692749B (en) | 2012-05-31 | 2012-05-31 | A kind of apparatus and method intercepting hot spot |
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| CN102692749A CN102692749A (en) | 2012-09-26 |
| CN102692749B true CN102692749B (en) | 2016-02-10 |
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| CN105158934B (en) * | 2015-10-08 | 2018-01-19 | 四川大学 | A kind of adjustable diaphragm based on spatial light modulator |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5327263A (en) * | 1989-12-18 | 1994-07-05 | Sharp Kabushiki Kaisha | Image processing apparatus employing a spatial light modulator |
| CN2511023Y (en) * | 2001-11-24 | 2002-09-11 | 中国工程物理研究院激光聚变研究中心 | Liquid-crystal light valve laser-beam space shaping apparatus |
| CN101881902A (en) * | 2010-06-08 | 2010-11-10 | 中国科学院上海光学精密机械研究所 | Amplitude light-addressed liquid crystal light valve device and preparation method thereof |
| CN102636877A (en) * | 2012-05-11 | 2012-08-15 | 中国工程物理研究院激光聚变研究中心 | Method for improving performance of beam shaper of liquid crystal light valve |
-
2012
- 2012-05-31 CN CN201210177127.1A patent/CN102692749B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5327263A (en) * | 1989-12-18 | 1994-07-05 | Sharp Kabushiki Kaisha | Image processing apparatus employing a spatial light modulator |
| CN2511023Y (en) * | 2001-11-24 | 2002-09-11 | 中国工程物理研究院激光聚变研究中心 | Liquid-crystal light valve laser-beam space shaping apparatus |
| CN101881902A (en) * | 2010-06-08 | 2010-11-10 | 中国科学院上海光学精密机械研究所 | Amplitude light-addressed liquid crystal light valve device and preparation method thereof |
| CN102636877A (en) * | 2012-05-11 | 2012-08-15 | 中国工程物理研究院激光聚变研究中心 | Method for improving performance of beam shaper of liquid crystal light valve |
Non-Patent Citations (1)
| Title |
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| 《双稳液晶电光调制器》;张洪钧、戴建华、杨君慧、高存秀;《物理学报》;19810630;第30卷(第6期);第810~819页 * |
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