CN102692749A - Device for light spot capture - Google Patents
Device for light spot capture Download PDFInfo
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- CN102692749A CN102692749A CN2012101771271A CN201210177127A CN102692749A CN 102692749 A CN102692749 A CN 102692749A CN 2012101771271 A CN2012101771271 A CN 2012101771271A CN 201210177127 A CN201210177127 A CN 201210177127A CN 102692749 A CN102692749 A CN 102692749A
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- hot spot
- intercepting
- light modulator
- lcd space
- gray level
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Abstract
The invention provides a device for light spot capture, which includes a light-shading body, wherein a light transmitting window is arranged in the light-shading body; transition zones are arranged at the edges of the light transmitting window; and the light transmission of the transition zones is gradually changed from full transmission to light-proof condition. The invention further provides a corresponding method for light spot capture. Compared with the prior art, the interior modulation of light spots can be avoided.
Description
Technical field
The present invention relates to laser technology field, specifically, the present invention relates to a kind of apparatus and method of intercepting hot spot.
Background technology
In the prior art, the general diaphragm that uses comes the intercepting hot spot in the laser optical path, thereby the light spot shape of propagating in the subsequent optical path is limited.Existing diaphragm generally adopts metal material to make, and typical mechanism of diaphragm is as shown in Figure 1, and its hole shape is definite as required, for example rectangle or circle etc.Yet, when adopting existing diaphragm to come the intercepting hot spot, there is following shortcoming:
1, hot spot is through behind the diaphragm, and inner can the appearance modulates, and influenced beam quality (as shown in Figure 2).
If 2 want to adjust shape, the size of diaphragm, have only the diaphragm that more renews, operation is inconvenience very.
Therefore, current press for a kind ofly can avoid hot spot inner modulation to occur, be convenient to adjust the shape of hot spot, the apparatus and method of intercepting hot spot of size.
Summary of the invention
The purpose of this invention is to provide a kind ofly can avoid hot spot inner modulation to occur, be convenient to adjust the shape of hot spot, the apparatus and method of intercepting hot spot of size.
According to an aspect of the present invention; The invention provides a kind of device of intercepting hot spot, comprise occulter, have optical transmission window (also can be described as the printing opacity diaphragm) in the said occulter; The edge of said optical transmission window has transitional zone, and the transmitance of light is become by full impregnated gradually and do not pass through in this transitional zone.
Wherein, the device of said intercepting hot spot comprises LCD space light modulator, and said optical transmission window is realized through in said LCD space light modulator, writing gray level image.
Wherein, The device of said intercepting hot spot also comprises the polarizer, left-handed 45 ° of rotors, 45 ° of rotors of dextrorotation and the analyzer that sets gradually along light path; Said LCD space light modulator is arranged between left-handed 45 ° of rotors and 45 ° of rotors of dextrorotation, the orthogonal thereto placement of the said polarizer and analyzer.
Wherein, The device of said intercepting hot spot also comprises the polarizer, two 1/2nd slides and the analyzers that set gradually along light path; Said LCD space light modulator is arranged between two said 1/2nd slides, the orthogonal thereto placement of the said polarizer and analyzer.
Wherein, the said polarizer is polarization splitting prism or polaroid.
According to a further aspect in the invention, a kind of method of intercepting hot spot of the device based on above-mentioned intercepting hot spot is provided also, has comprised the following steps:
1) write gray level image at said LCD space light modulator, the edge of this gray level image has transitional zone, and the pixel grey scale in this transitional zone becomes minimum by maximum gradually;
2) thus make light beam through said LCD space light modulator intercepting hot spot.
Wherein, in the said step 1), the shape of said gray level image by desired intercepting after light spot shape confirm.
Wherein, in the said step 1), the size of said gray level image by desired intercepting after spot size confirm.
Compared with prior art, the present invention has following technique effect:
1, the present invention can avoid hot spot inner modulation to occur.
2, the present invention is convenient to adjust shape, the size of institute's intercepting hot spot.
Description of drawings
Fig. 1 shows a kind of typical mechanism of diaphragm in the prior art;
Fig. 2 shows through the inner light spot image that modulation occurs behind the existing diaphragm;
Fig. 3 shows the device of the intercepting hot spot in the one embodiment of the invention;
Fig. 4 shows the softening square diaphragm of band that writes LCD space light modulator in the one embodiment of the invention;
Fig. 5 shows the softening circular iris of band that writes LCD space light modulator in the one embodiment of the invention;
Fig. 6 shows one jiao of the softening circular iris of the band that writes LCD space light modulator in the one embodiment of the invention;
Fig. 7 shows the hot spot that collects on the CCD in the one embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is done further description.
Fig. 3 shows the light path of the device of 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 (be Polarization Cube Beamsplitter, be abbreviated as PBS), left-handed 45 ° of rotors 2, LCD space light modulator 3,45 ° of rotors 4 of dextrorotation and the polarization splitting prism 5 that sets gradually along light path.
In the present embodiment, first PBS plays the effect (understand easily, PBS also can replace with polaroid) of the polarizer, and it makes the polarization state of light level.Left-handed 45 ° of rotors can make polarization state of light become 45 ° with the long axis of liquid crystal molecule of LCD space light modulator left-handed 45 ° of the light of polarization state level like this, thereby make the Modulation and Amplitude Modulation of LCD space light modulator reach maximum.Polarization state was rotated 90 ° when the left-handed 45 ° light of polarization state passed through LCD space light modulator, by 45 ° of rotors of dextrorotation polarization state was transferred to vertically again, at last through vertical polarization splitting prism 5 (playing the effect of analyzer) outgoing of placing.Can find out that from the foregoing description the polarising means (device is vertical with analyzer partially promptly) of pair of orthogonal will be arranged before and after the LCD space light modulator.Can be a pair of PBS, also can be a pair of polaroid.The polarising means of front has been responsible for partially, horizontal polarization attitude process, and the polarising means of back is responsible for analyzing, vertical polarization attitude process.In addition; According to another embodiment of the present invention; Above-mentioned left-handed 45 ° of rotors and 45 ° of rotors of dextrorotation also can use two 1/2nd wave plates to replace, and the line polarisation of incident and the optical axis included angle of 1/2nd wave plates are 22.5 °, can play the effect that makes 45 ° of polarization state of light rotations equally.
On LCD space light modulator, can write the gray level image of different shape and size, when the gray level image gray-scale value that on liquid crystal, writes was 0, corresponding transmitance was 0; Gray-scale value is 255 o'clock, and transmitance is maximum; When gray-scale value from 0 to 255 changed, transmitance was changed from small to big.Utilize this point, can make the softening diaphragm of marginal belt.So-called softening, be exactly that transmitance gradually changes, directly become unlike traditional diaphragm edge and do not pass through by full impregnated, there is not transition.Fig. 4 and Fig. 5 show the softening square and circular gray level image of band that writes LCD space light modulator respectively.Fig. 6 shows one jiao of the softening circular gray level image of the band that writes LCD space light modulator of amplification, and figure can find out this circle gray level image softening process from inside to outside thus.Above-mentioned gray level image is write LCD space light modulator, in fact just in lighttight shielded area, formed an optical transmission window consistent with the gray level image that is write.And the edge of this optical transmission window (being optical transmission window and shielded area intersection) has transitional zone, and the transmitance in this transitional zone is become by full impregnated does not gradually pass through, thereby forms the softening diaphragm of marginal belt.
When utilizing the device intercepting hot spot of above-mentioned intercepting hot spot; At first; Write gray level image at said LCD space light modulator, the edge of this gray level image has transitional zone, and the pixel grey scale in this transitional zone becomes minimum (i.e. the softening gray level image of band) by maximum gradually; Thereby make light beam then through said LCD space light modulator intercepting hot spot.Wherein, the shape of gray level image by desired intercepting after light spot shape confirm.The size of gray level image is also confirmed by spot size after the desired intercepting.
The softening gray level image of band can be made also can draw through photoshop and form with the matlab programming.Find out easily, utilize the device of the intercepting hot spot of the foregoing description, shape of change diaphragm that can be quick, real-time (for example circle, rectangle, rhombus etc.) and size, the softening degree of diaphragm also can according to circumstances be provided with flexibly.
In reality test, when writing rectangle gray level image shown in Figure 4 in the device of the intercepting hot spot of the foregoing description, it is as shown in Figure 7 to detect the hot spot that is collected with CCD, can see that the quality of glossing up is very good, does not have the inner modulation phenomenon.The inventor finds also that under study for action when in LCD space light modulator, writing the rectangle gray level image of no transitional zone, detecting the hot spot that is collected with CCD is consistent with Fig. 2, promptly has the inner modulation phenomenon.Can find out, when the intercepting hot spot, replace hard-edge can avoid it inner modulation to occur with soft limit.
In addition, in one embodiment, need convert spot size into the gray matrix of liquid crystal spatial light adjuster according to usable area, the number of pixels of liquid crystal spatial light adjuster.For example, if will make the square hot spot of a 10mm * 10mm, if the usable area of used liquid crystal spatial light adjuster is: 26,6mm * 20,0mm, number of pixels is: 832x 624.Then 10/ (26.6/832)=313.If make hot spot, then need write one 313 * 313 gray matrix with matlab.
In one embodiment, said LCD space light modulator can directly use the matured product on the market.In another embodiment; Can be by following basic making principles LCD space light modulator: between two transparent electrode substrates (transmitance is more than 90%), charge into the thick nematic liquid crystal in the 10 μ m left and right sides; Form sandwich structure; Make the major axis of liquid crystal molecule that 90 ° of continuous distortions take place between substrate, process the liquid crystal cell that twisted-nematic is arranged.This LCD space light modulator principle of work is following: reverse liquid crystal (twisted-nematic liquid crystal---TN-LC) molecular material (Sony LCX-016) to row; Arrange with nematic structure; In twisted liquid crystal element front and rear surfaces, molecule parllel is in surperficial directrix.When light incident, linear polarization is parallel to the directrix direction of the plane of incidence, and light is rotated 90 ° through light valve rear polarizer attitude.When voltage was carried on the TN-LC, molecular orientation changed up to being parallel to extra electric field.The change of molecular orientation influences the optical thickness of polarization state of light, element, and different voltages cause the state of TN-LC to be represented by the Jones matrix, can predict polarization state and light field phase place.TN-LC is placed between the polaroid of two quadratures 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, thereby make the transmittance of LCD space light modulator change.When extra electric field strengthened, the transmittance of LCD space light modulator also increased thereupon, and during greater than the threshold voltage of LCD space light modulator, the transmittance of LCD space light modulator will keep the maximum transmission rate constant up to the intensity of extra electric field.Import the transmitance that the LCD space light modulator gradation data can be controlled LCD space light modulator equally through the VGA data line.Native system adopts fixed voltage 15V exactly, through the VGA data line, imports the control that gray scale image is realized the light valve transmitance.
In addition, though the foregoing description all adopts LCD space light modulator to make the softening diaphragm of marginal belt, based on the description of preamble; One skilled in the art will readily appreciate that the softening diaphragm of marginal belt of the present invention is not limited to LCD space light modulator, as long as have an occulter; In the shielded area of this occulter, form optical transmission window; The edge of this optical transmission window has transitional zone, and the transmitance in this transitional zone is become by full impregnated does not gradually pass through, and can form the softening diaphragm of marginal belt.
In addition, in the foregoing description, edge has the softening factor of the optical transmission window of transitional zone can be selected flexibly, for example can combine experiment, utilizes CCD to gather hot spot, according to the light spot image of being gathered the softening factor is carried out choose reasonable.Wherein, the softening factor is that light intensity is by the geometry spacing at full strength bore place to zero intensity bore place and the ratio of light zero intensity bore.
At last, the above embodiments only are used for explaining the present invention, and it should not be construed is that protection scope of the present invention is carried out any restriction.And, it will be apparent to those skilled in the art that do not breaking away under the foregoing description spirit and the principle, to various equivalent variation that the foregoing description carried out, modification and in the text not the various improvement of description all within the protection domain of this patent.
Claims (8)
1. the device of an intercepting hot spot comprises occulter, has optical transmission window in the said occulter, and the edge of said optical transmission window has transitional zone, and the transmitance of light is become by full impregnated gradually and do not pass through in this transitional zone.
2. the device of intercepting hot spot according to claim 1 is characterized in that, the device of said intercepting hot spot comprises LCD space light modulator, and said optical transmission window is realized through in said LCD space light modulator, writing gray level image.
3. the device of intercepting hot spot according to claim 2; It is characterized in that; The device of said intercepting hot spot also comprises the polarizer, left-handed 45 ° of rotors, 45 ° of rotors of dextrorotation and the analyzer that sets gradually along light path; Said LCD space light modulator is arranged between left-handed 45 ° of rotors and 45 ° of rotors of dextrorotation, the orthogonal thereto placement of the said polarizer and analyzer.
4. the device of intercepting hot spot according to claim 2; It is characterized in that; The device of said intercepting hot spot also comprises the polarizer, two 1/2nd slides and the analyzers that set gradually along light path; Said LCD space light modulator is arranged between two said 1/2nd slides, the orthogonal thereto placement of the said polarizer and analyzer.
5. according to the device of claim 3 or 4 described intercepting hot spots, it is characterized in that the said polarizer is polarization splitting prism or polaroid.
6. the method based on the intercepting hot spot of the device of the described intercepting hot spot of claim 2 is characterized in that, comprises the following steps:
1) write gray level image at said LCD space light modulator, the edge of this gray level image has transitional zone, and the pixel grey scale in this transitional zone becomes minimum by maximum gradually;
2) thus make light beam through said LCD space light modulator intercepting hot spot.
7. the method for intercepting hot spot according to claim 6 is characterized in that, in the said step 1), the shape of said gray level image by desired intercepting after light spot shape confirm.
8. the method for intercepting hot spot according to claim 6 is characterized in that, in the said step 1), the size of said gray level image by desired intercepting after spot size confirm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210177127.1A CN102692749B (en) | 2012-05-31 | 2012-05-31 | A kind of apparatus and method intercepting hot spot |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210177127.1A CN102692749B (en) | 2012-05-31 | 2012-05-31 | A kind of apparatus and method intercepting hot spot |
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| CN102692749A true CN102692749A (en) | 2012-09-26 |
| CN102692749B CN102692749B (en) | 2016-02-10 |
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| CN201210177127.1A Expired - Fee Related CN102692749B (en) | 2012-05-31 | 2012-05-31 | A kind of apparatus and method intercepting hot spot |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105158934A (en) * | 2015-10-08 | 2015-12-16 | 四川大学 | Adjustable diaphragm of spatial light modulator |
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| 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 | Laser beam space shaping device for liquid crystal light valve |
| 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 type optical addressing 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 | Laser beam space shaping device for liquid crystal light valve |
| 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 type optical addressing 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)
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| 张洪钧、戴建华、杨君慧、高存秀: "《双稳液晶电光调制器》", 《物理学报》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105158934A (en) * | 2015-10-08 | 2015-12-16 | 四川大学 | Adjustable diaphragm of spatial light modulator |
| CN105158934B (en) * | 2015-10-08 | 2018-01-19 | 四川大学 | A kind of adjustable diaphragm based on spatial light modulator |
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| CN102692749B (en) | 2016-02-10 |
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Granted publication date: 20160210 Termination date: 20200531 |