CN102623881B - Adjustment method for laser output energy - Google Patents
Adjustment method for laser output energy Download PDFInfo
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- CN102623881B CN102623881B CN201210077435.7A CN201210077435A CN102623881B CN 102623881 B CN102623881 B CN 102623881B CN 201210077435 A CN201210077435 A CN 201210077435A CN 102623881 B CN102623881 B CN 102623881B
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Abstract
The invention provides an adjustment method for laser output energy, wherein the target energy value output by a laser is B. The energy adjustment method comprises the following steps of: (1) writing an original image in a liquid crystal spatial light modulator arranged in a light path of a laser system, and measuring the energy value A of the output laser at the outlet of the laser system by a energy meter; (2) calculating the grey value of an adjusting image which needs to be input in the liquid crystal spatial light modulator for obtaining the target energy value B based on the Gamma curve of the liquid crystal spatial light modulator and according to the original image, the energy value A of the output laser measured at the outlet, and the target energy value B; and (3) writing the adjusting image in the liquid crystal spatial light modulator, so as to obtain the adjusted laser output energy. The adjustment method for laser output energy provided by the invention can accurately and rapidly adjust the laser output energy to the needed energy.
Description
Technical field
The present invention relates to laser technology field, specifically, the present invention relates to a kind of Laser output energy adjusting method.
Background technology
Laser system generally need to be adjusted Laser output energy, and user can change the size of energy output according to the actual requirements like this.Fig. 1 shows a kind of typical Laser output energy adjusting scheme in prior art.This scheme is to place rotatable 1/2nd wave plates 2 (as shown in Figure 1 at the equipped at outlet port of laser casing 1,3 other opticses that represent laser in figure), by the rotation of step motor control 1/2nd wave plates 2, thereby Laser output energy is adjusted.
Yet, utilize the accuracy of output energy size of above-mentioned Laser output energy adjusting scheme not high.On the one hand, because the running accuracy of stepping motor is not enough, stepping motor comes, the moving identical step number of travelling backwards, and the angle of 1/2nd wave plate rotations but can not be strictly consistent.On the other hand, according to horse Lu law, in 1/2nd wave plates, energy and wave plate optical axis angle are not linear change, and as shown in Figure 2, relational expression is I=I to the variation relation of its energy and wave plate optical axis angle
0cOS
2θ, wherein I representative system is finally exported energy, I
0the output energy that represents the front laser of 1/2nd wave plates, θ represents the angle changing of 1/2nd wave plate optical axises.Can find out, the slope of every in the variation relation curve of energy and wave plate optical axis angle is different, and the variation of slope is larger.And slope represents, be rate of change, when slope is larger, to obtain Shaoxing opera strong for energy changing.And, while making 1/2nd wave plates, making material can not accomplish definitely evenly, therefore, the refractive index of the zones of different of single 1/2nd wave plates is not on all four (1/2nd wave plates exists the problem of lack of uniformity), and this will cause K-theoretic operation K and actual value to occur deviation.For example: 1/2nd wave plates turn the effect of 3 ° in theory, may in fact need to turn 5 ° just can reach.Therefore, by 1/2nd wave plates whens rotation of step motor control, be difficult to estimate exactly according to the stepping of stepping motor and step-length the size of exported Laser output energy, often need repeatedly to regulate.When the repetition rate of laser is lower, for example 20 minutes output primary energies, repeatedly regulate and will cause the adjustment of Laser output energy very consuming time, very inconvenient.
In addition, in the larger position of the variation relation slope of a curve of energy and wave plate optical axis angle, the inconsistency of the refractive index of 1/2nd slide zoness of different also can cause and have a strong impact on the uniformity of output energy.
Moreover because stepping motor volume is larger, therefore the required space taking of existing Laser output energy adjusting method is also larger.
In sum, current in the urgent need to a kind of Laser output energy adjusting method to institute's energy requirement by Laser output energy adjusting quickly and accurately, and need to improve the uniformity of institute's Output of laser after Laser output energy adjusting, and reduce the shared space of Laser output energy adjusting.
Summary of the invention
One of object of the present invention is to provide a kind of Laser output energy adjusting method to institute's energy requirement by Laser output energy adjusting quickly and accurately.
Two of object of the present invention is uniformities of institute's Output of laser after raising Laser output energy adjusting.
Three of object of the present invention is to reduce the shared space of Laser output energy adjusting.
For achieving the above object, the invention provides a kind of Laser output energy adjusting method, the target energy value of Laser output is B, and described energy adjusting method comprises the following steps:
1) in the LCD space light modulator in being arranged on the light path of laser system, write original image, with energy meter, in the exit of laser system, measure the energy value A of exported laser;
2) the Gamma curve based on described LCD space light modulator, according to described original image, exit, measure energy value A, the target energy value B of exported laser, calculate as obtaining the gray value of the adjustment image of target energy value B required input LCD space light modulator;
3) adjustment image is written in LCD space light modulator to the Laser output energy after being adjusted.
Wherein, described step 1), in, LCD space light modulator is arranged on Bright efficacy and density and is less than 2.2MW/cm described in incident
2.
Wherein, the described laser system for Output of laser energy is provided with laser amplifier, described step 1) also comprise: described LCD space light modulator is arranged in the light path of laser amplifier.
Wherein, described laser amplifier comprises the first laser amplifier assembly and the second laser amplifier assembly, described step 1) also comprise: described LCD space light modulator is arranged between described the first laser amplifier assembly and described the second laser amplifier assembly.
Wherein, described step 2), in, light spot shape and size according to the laser of pel spacing and the described LCD space light modulator of input, draw the corresponding pixel array of original image, original image is being write fashionable, only the pixel in drawn pixel array is being carried out to write operation; Described step 4) in, according to light spot shape and the size of the laser of pel spacing and the described LCD space light modulator of input, draw and adjust the corresponding pixel array of image, adjustments image is being write fashionable, the pixel in drawn pixel array is carried out to write operation.
Wherein, described step 2) also comprise before aligning step: proofread and correct the Gamma curve shape of described LCD space light modulator so that its linearisation;
Described step 2) comprise following sub-step:
21) according to target energy value B, calculating K value, K=B/A;
22) by K value, be multiplied by respectively the gray value of each pixel of original image, be adjusted the gray value of image.
Wherein, described correction Gamma curve shape comprises the following steps:
11) according to original Gamma curve, determine desired linearizing Gamma curve;
12) by interpolation, the series of discrete point of original Gamma curve is carried out to the equation that matching obtains original Gamma curve;
13) for corresponding grey scale value X in desired linearizing Gamma curve, be spaced apart each performance number Y of 1, equation based on the resulting original Gamma curve of matching is obtained the corresponding new gray value x of this performance number Y, thereby obtain the corresponding relation of gray value X and new gray value x, and write the image processing module that drives described LCD space light modulator.
Wherein, described step 13) in, resulting gray value X is write to the image processing module that drives described LCD space light modulator with the corresponding relation of new gray value x; When LCD space light modulator being write to a certain gray level image by described image processing module, this image processing module first replaces with new gray value x by each pixel of this gray level image by old gray value X, then the image that replaces to new gray value is write to LCD space light modulator.
Compared with prior art, the present invention has following technique effect:
1, the present invention can be quickly and accurately by Laser output energy adjusting to institute's energy requirement.
2, processing ease of the present invention, very easily realizes.
3, the space taking required for the present invention is less.
4, the laser energy good uniformity that the present invention exports.
Accompanying drawing explanation
Fig. 1 shows the schematic diagram of typical Laser output energy adjusting of the prior art;
Fig. 2 shows the variation relation schematic diagram of the angle of energy and wave plate in 1/2nd wave plates;
Fig. 3 shows the flow chart of one embodiment of the invention;
Fig. 4 shows the index path of the Laser output energy adjusting of one embodiment of the invention;
Fig. 5 shows the original image in one embodiment of the invention;
Fig. 6 shows the adjustment image in one embodiment of the invention;
Fig. 7 shows the original Gamma curve of the LCD space light modulator in one embodiment of the invention;
Fig. 8 shows the Gamma curve after the correction of the LCD space light modulator in one embodiment of the invention.
Embodiment
The present invention proposes a kind of Laser output energy adjusting method based on Modulation and Amplitude Modulation type LCD space light modulator (being designated hereinafter simply as LCD space light modulator).LCD space light modulator claims again liquid crystal light valve, and it is the spatial light modulation device of a kind of high-contrast, high-resolution, active, codified, is mainly used at present laser beam space shaping.This case inventor notice: LCD space light modulator has the property of compiling, and this feature is well suited for for Laser output energy adjusting.
Below in conjunction with drawings and Examples, the present invention is done further and described.
According to one embodiment of present invention, provide a kind of Laser output energy adjusting method, Fig. 3 shows the flow process of this Laser output energy adjusting method.For convenience of describing, the target energy value of establishing Laser output is B.With reference to figure 3, described energy adjusting method comprises the following steps:
1, LCD space light modulator is arranged in the light path of the laser system that need to export energy adjusting.
2, in LCD space light modulator, write original image, with energy meter, in the exit of laser system, measure the energy value A of exported laser.Should be noted that A is greater than B herein, this is that those skilled in the art are understandable.
3, the Gamma curve based on described LCD space light modulator, according to described original image, exit, measure energy value A, the target energy value B of exported laser, calculate as obtaining the gray value of the adjustment image of target energy value B required input LCD space light modulator.
When the Gamma of LCD space light modulator curve is while being linear, can be according to target energy value B, calculating K value, K=B/A, is then multiplied by respectively the gray value of each pixel of original image by K value, be adjusted the gray value of image.
4, adjustment image is written in LCD space light modulator to the Laser output energy after being adjusted.
Wherein, used the compiling property of LCD space light modulator in the step 2 of the present embodiment and step 4, the gray value of hot spot inside is exercisable.In LCD space light modulator, write different gray scales, the transmitance of light can be different.Write gray scale and be 0 o'clock corresponding be black image, the transmitance in this time is almost 0, writing gray scale is 255 o'clock, corresponding is white image, now the transmitance of LCD space light modulator is maximum.
In addition, in LCD space light modulator, the hot spot that write a great hot spot, what shape also can compile.Therefore, in another embodiment, in described step 2, can, according to light spot shape and the size of the laser of pel spacing and the described LCD space light modulator of input, draw the corresponding pixel array of original image.For example: the LCD space light modulator pel spacing 32 μ m of employing, the picture element matrix of whole LCD space light modulator is 832 * 624, utilizes this relation, can calculate the picture element matrix size of the hot spot that will write.Such as the square hot spot of 10mm * 10mm, the picture element matrix size of its corresponding LCD space light modulator is exactly 312 * 312.Further, original image is being write fashionable, only the pixel in drawn pixel array is being carried out to write operation, can effectively control like this size of transmitting beam.
Introduce an application example based on above-described embodiment below.In this example, described laser system adopts the laser system that is provided with laser amplifier in light path, and Fig. 4 shows an example of this laser system structure, and described laser system comprises seed laser generation device 1 and laser amplifier.Described laser amplifier comprises the first laser amplifier assembly 2 and the second laser amplifier assembly 4.Wherein, seed laser generation device 1 is for exporting the seed laser that energy is 1nJ.The first laser amplifier assembly 2 is the laser that 20mJ, spot size are 10mm * 10mm for the seed laser of 1nJ being enlarged into energy.The second laser amplifier assembly 4 is for being that to be further enlarged into energy be the laser that 2J, spot size are 50mm * 50mm for laser that 20mJ, spot size are 10mm * 10mm by energy.In conjunction with reference to figure 3, in this embodiment, Laser output energy adjusting method comprises the following steps:
1, LCD space light modulator 3 is arranged in the light path of described laser system.Setting position is between described the first laser amplifier assembly 2 and described the second laser amplifier assembly 4.
2, in LCD space light modulator, write the original image shown in Fig. 5 (being original hot spot), with energy meter, in the exit of laser system, measure the energy value A=2J of exported laser.
3, according to target energy value B=1.6J, calculating K value, K=B/A=0.8.
4, by K value, be multiplied by respectively the gray value of each pixel of original image, be adjusted the gray value of image.
5, adjustment image is written in LCD space light modulator to the Laser output energy after being adjusted.Expect the energy of 1.6J, will in LCD space light modulator, write the hot spot shown in Fig. 6, each pixel of this hot spot original hot spot as shown in Figure 5 is multiplied by K value 0.8 and obtains.
In this embodiment, although LCD space light modulator 3 is arranged in the light path of laser amplifier (being arranged between the first laser amplifier assembly 2 and the second laser amplifier assembly 4), but before or after one skilled in the art will readily appreciate that LCD space light modulator 3 also can be arranged on laser amplifier.
It should be noted that, above-described embodiment is that the Gamma curve in hypothesis LCD space light modulator is under the prerequisite of linear change and implements.The Gamma curve of LCD space light modulator is gray scale and the power transmitance change curve of LCD space light modulator.In general, the linearity of the Gamma curve of LCD space light modulator is lower, now, before carrying out described step 2, also needs to proofread and correct Gamma curve shape to improve its linearity, makes it level off to straight line.Below, provide a kind of preferred version that the Gamma curve of LCD space light modulator is carried out to linearisation correction.In this linearisation correcting scheme, described LCD space light modulator is driven by an image processing module.Fig. 7 shows and uses the measured original Gamma curve of 1053nm laser incident LCD space light modulator (generally, original Gamma curve is actually and characterizes by a series of discrete point that obtains of actual measurement), its abscissa is that gray value, ordinate are performance number.Described linearisation correcting scheme comprises the following steps:
11) according to original Gamma curve, determine desired linearizing Gamma curve.The minimum gradation value of for example getting original Gamma curve is connected with straight line with corresponding two coordinate points of maximum gradation value, can obtain desired linearizing Gamma curve.
12), to original Gamma curve, relying on Lagrange interpolation is that the discrete point matching that gray value, ordinate are performance number obtains curvilinear equation by abscissa.
13) for gray value X in desired linearizing Gamma curve, be spaced apart each performance number Y of 1, utilize Bolzano dichotomy, the curvilinear equation based on the resulting original Gamma curve of matching is obtained the corresponding new gray value x of this performance number Y.Thereby obtain the corresponding relation of gray value X and new gray value x, and write the image processing module that connects LCD space light modulator.When input gray level value X, image processing module is replaced with its corresponding new gray value x like this, and new gray value x is written into the respective pixel of LCD space light modulator, thereby reaches the effect that original Gamma curve is carried out to linearisation correction.Fig. 8 shows the Gamma curve of a LCD space light modulator after above-mentioned linearisation is proofreaied and correct.After Gamma curvature correction, in the step 2 of previous embodiment, described original image writes in LCD space light modulator by described image processing module, and in the step 5 of previous embodiment, described adjustment image also writes in LCD space light modulator by described image processing module.This is that those skilled in the art are understandable.This linearisation correcting scheme can be proofreaied and correct Gamma curve rapidly and accurately, thereby Laser output energy adjusting becomes more accurately and convenient operation.
Except above-mentioned Gamma curve carries out the method for linearisation correction, the present invention can also adopt the multiple Gamma curve to LCD space light modulator of the prior art to carry out linearisation correction.For example LCD space light modulator can be connected with video card, by computer display card driver, regulate the numerical value of contrast, brightness and gray scale, thereby the shape of change Gamma curve makes it be linear change.
This case inventor is through a large amount of research and experiment, and while finding LCD space light modulator to be used for Laser output energy adjusting, the power density that incides the hot spot in LCD space light modulator is less than 2.2MW/cm
2time, can avoid incident laser power density to surpass the loss threshold value of LCD space light modulator and cause it normally to work, therefore, preferably, in described step 1 in the above-described embodiments, the Bright efficacy and density of LCD space light modulator should be less than 2.2MW/cm described in incident
2.
In addition, preferably, when carrying out Laser output energy adjusting, need to keep the size of the hot spot of incident laser to be less than the size on LCD space light modulator surface.
In an actual test, the maximum output energy of laser amplifier is at 2J, the energy of desired output 640mJ.First in LCD space light modulator, write original image, the energy recording in outlet is 800mJ, according to K=B/A, calculates, and obtains K=0.8, then according to K value, obtaining adjusting accordingly image and being write in LCD space light modulator, is 646mJ at the actual energy recording of outlet.Can find out that adjustment process is accurate rapidly, the actual energy recording is very little with the energy phase ratio error of desired output, and result is satisfactory.
Finally it should be noted that, above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, and modification, variation, application and the embodiment that in application, can extend to other think that all such modifications, variation, application, embodiment are within the spirit and scope of the present invention simultaneously.
Claims (6)
1. a Laser output energy adjusting method, the target energy value of setting laser output is B, described energy adjusting method comprises the following steps:
1) in the LCD space light modulator in being arranged on the light path of laser system, write original image, with energy meter, in the exit of laser system, measure the energy value A of exported laser; The position of described LCD space light modulator in described light path makes the Bright efficacy and density of LCD space light modulator described in incident be less than 2.2MW/cm
2;
2) the Gamma curve based on described LCD space light modulator, according to described original image, exit, measure energy value A, the target energy value B of exported laser, calculate as obtaining the gray value of the adjustment image of target energy value B required input LCD space light modulator;
3) adjustment image is written in LCD space light modulator to the Laser output energy after being adjusted;
Wherein, the Gamma curve of described LCD space light modulator is the linearisation Gamma curve after proofreading and correct; Described step 2) comprise following sub-step:
21) according to target energy value B, calculating K value, K=B/A;
22) by K value, be multiplied by respectively the gray value of each pixel of original image, be adjusted the gray value of image.
2. Laser output energy adjusting method according to claim 1, it is characterized in that, laser system for Output of laser energy is provided with laser amplifier, and described step 1) also comprises: described LCD space light modulator is arranged in the light path of laser amplifier.
3. Laser output energy adjusting method according to claim 2, it is characterized in that, described laser amplifier comprises the first laser amplifier assembly and the second laser amplifier assembly, and described step 1) also comprises: described LCD space light modulator is arranged between described the first laser amplifier assembly and described the second laser amplifier assembly.
4. according to the Laser output energy adjusting method described in any one in claims 1 to 3, it is characterized in that, described step 2) in, according to light spot shape and the size of the laser of pel spacing and the described LCD space light modulator of input, draw the corresponding pixel array of original image, original image is being write fashionable, only the pixel in drawn pixel array is being carried out to write operation.
5. Laser output energy adjusting method according to claim 4, is characterized in that, the correction of described linearisation Gamma curve comprises the following steps:
11) according to original Gamma curve, determine desired linearizing Gamma curve;
12) by interpolation, the series of discrete point of original Gamma curve is carried out to the equation that matching obtains original Gamma curve;
13) for corresponding grey scale value X in desired linearizing Gamma curve, be spaced apart each performance number Y of 1, equation based on the resulting original Gamma curve of matching is obtained the corresponding new gray value x of this performance number Y, thereby obtains the corresponding relation of gray value X and new gray value x.
6. Laser output energy adjusting method according to claim 5, is characterized in that, in described step 13), resulting gray value X is write to the image processing module that drives described LCD space light modulator with the corresponding relation of new gray value x; When LCD space light modulator being write to a certain gray level image by described image processing module, this image processing module first replaces with new gray value x by each pixel of this gray level image by old gray value X, then the image that replaces to new gray value is write to LCD space light modulator.
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| CN103904548A (en) * | 2014-04-10 | 2014-07-02 | 深圳市大族激光科技股份有限公司 | Laser power stability control method and system |
| CN104765176B (en) * | 2015-04-27 | 2017-06-30 | 北京工业大学 | A kind of liquid crystal spatial modulates regenerative amplifier |
| CN112711177B (en) * | 2020-12-16 | 2022-07-05 | 江苏迪盛智能科技有限公司 | Method and device for processing splicing seams of light-processed images |
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| 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 |
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| RU2002116304A (en) * | 2002-06-19 | 2004-01-27 | Государственное унитарное предпри тие Научно-исследовательский институт лазерной физики | Laser image projection method and laser projector |
| US7703922B2 (en) * | 2005-07-15 | 2010-04-27 | Jozef F Van de Velde | Relaxed confocal catadioptric scanning laser ophthalmoscope |
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| 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 |
Non-Patent Citations (1)
| Title |
|---|
| 唐熊忻 等.液晶空间光调制器Gamma曲线的调整方法及其对光束整形的影响.《中国光学学会2011年学术大会摘要集》.2011, * |
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