CN104460007B - Laser tripled-frequency space intensity shaping method - Google Patents
Laser tripled-frequency space intensity shaping method Download PDFInfo
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- CN104460007B CN104460007B CN201410850141.2A CN201410850141A CN104460007B CN 104460007 B CN104460007 B CN 104460007B CN 201410850141 A CN201410850141 A CN 201410850141A CN 104460007 B CN104460007 B CN 104460007B
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- frequency
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- laser
- hot spot
- tripling
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0927—Systems for changing the beam intensity distribution, e.g. Gaussian to top-hat
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
Abstract
The invention belongs to the optical field, and relates to a space intensity shaping method, in particular to a laser tripled-frequency space intensity shaping method. The problems that an existing tripled-frequency laser output beam is poor in quality and laser system running is poor in safety are solved. The method comprises the specific steps that firstly, a liquid crystal compensation tripled-frequency image is generated; secondly, a tripled-frequency laser local shaping image is generated; thirdly, space intensity shaping is completed.
Description
Technical field
The present invention relates to a kind of spatial-intensity shaping methods are and in particular to a kind of spatial-intensity shaping side of laser frequency tripling
Method, belongs to laser application.
Background technology
In recent years, in industrial processes, the application demand in the field such as scientific research constantly expanded high power laser light.Solid state laser by
Higher in its gain, therefore, in high power laser light field, solid state laser using commonplace.High-power ultraviolet laser light
Wavelength is short, diffraction is little, be widely used in industrial processes and scientific research field.Adopting non-linear frequency the generation of Ultra-Violet Laser more
The mode of conversion, typically adopts kdp crystal as the medium of nonlinear frequency conversion.Frequency tripled laser is led in spatial-intensity shaping
Domain application is relatively broad, but existing frequency tripled laser output beam is second-rate, and the safety that laser system is run is poor.
Content of the invention
The present invention is the second-rate of the existing frequency tripled laser output beam of solution, and the safety that laser system is run is poor
Problem, and then propose a kind of laser frequency tripling spatial-intensity shaping methods.
The present invention is to solve the above problems and adopt the technical scheme that: the specifically comprising the following steps that of the method for the invention
Step one, generation liquid crystal compensation frequency tripling image；
Step 2, generation frequency tripled laser local shaping image；
Step 3, complete spatial-intensity shaping.
The invention has the beneficial effects as follows: the spatial-intensity shaping methods in high power laser light frequency conversion of the present invention, can
Frequency tripled laser is carried out with spacing shaping, exports the uniform frequency tripled laser of flat-top.The uniform spatial distribution of frequency tripled laser
The safety in operation of laser system can be improved well, the fan-out capability for laser system provides space.The space of frequency tripled laser
Distributing homogeneity is the light source of the science Physical Experiment offer high-quality of laser, improves the reliability of data.
Brief description
Fig. 1 is the FB(flow block) generating liquid crystal compensation frequency tripling image, and Fig. 2 is the initial of write LCD space light modulator
Image, Fig. 3 is output facula schematic diagram after fundamental frequency light compensates, and Fig. 4 is the graphics of output facula after fundamental frequency light compensates, and Fig. 5 is
Output facula line intensity profile schematic diagram after fundamental frequency light compensation, Fig. 6 is frequency tripling output near field gray scale after initial compensation fundamental frequency light
Figure, Fig. 7 is frequency tripling output near field graphics after initial compensation fundamental frequency light, and Fig. 8 is frequency tripling output after initial compensation fundamental frequency light
Near field line intensity profile schematic diagram, Fig. 9 a is the location spot schematic diagram that write LCD space light modulator positions image acquisition,
Fig. 9 b is the location spot schematic diagram of the fundamental frequency light ccd collection of write LCD space light modulator, and Fig. 9 c is write liquid crystal spatial
The location spot schematic diagram of photomodulator frequency tripling light ccd collection, Figure 10 is frequency tripling ideal hot spot schematic diagram, and Figure 11 is three times
The preferable hot spot line intensity profile schematic diagram of frequency, Figure 12 is calculated fundamental frequency light ideal hot spot schematic diagram, and Figure 13 is to calculate
The fundamental frequency light ideal hot spot x wire intensity profile schematic diagram arriving, Figure 14 is calculated fundamental frequency light ideal hot spot vertical line ash
Degree distribution schematic diagram, Figure 15 be write LCD space light modulator compensation image, Figure 16 be compensate after frequency tripling light output near
Field gray-scale maps, Figure 17 is frequency tripling light output near field graphics after compensation, and Figure 18 is frequency tripling light output near field line ash after compensation
Degree distribution schematic diagram, Figure 19 is with the compensation figure softening hole, and Figure 20 is frequency tripling light output near field ash after local compensates
Degree figure, Figure 21 is frequency tripling light output near field graphics after local compensates, and Figure 22 is frequency tripling light output after local compensates
Near field line intensity profile schematic diagram.
Specific embodiment
Specific embodiment one: with reference to Fig. 1 to Figure 22, present embodiment is described, a kind of three times of laser described in present embodiment
The spatial-intensity shaping methods of frequency are achieved by the steps of:
Step one, generation liquid crystal compensation frequency tripling image；
Step 2, generation frequency tripled laser local shaping image；
Step 3, complete spatial-intensity shaping.
Used in present embodiment, high power laser system includes front end seed source, pre- place system, main place system, frequency
Converting system, Beam Control, measuring system and centralized computer control system.The front end of wherein high power laser system adopts complete
Optical fiber structure, can Output of laser wavelength 1053mm, energy 10nj, pulsewidth 3ns square wave；Pre- place system provides high-gain 105Times,
There is LCD space light modulator its rear end, exports laser energy 200 μ j, beam size φ 13mm after spacing shaping；Main place system
Using " three-level round trip+one-level one way " neodymium glass bar-shaped amplifier, diameter is respectively φ 20mm, φ 40mm and 2 φ 70mm, energy
Enough export energy 100j, beam size φ 60mm；2 kdp crystal are had to be capable of frequency tripling output, ripple in frequency conversion system
Long 351nm, energy 50j；In Beam Control and measuring system, arbitrarily whole including laser spatial-intensity shaping capability and time waveform
Shape ability.The measurement of laser parameter includes exporting energy, near field, far field and waveform；Centralized computer control system is capable of
The overall situation control that laser instrument runs, including the acquisition of laser parameter measurement data, the discharge and recharge in main discharge source, frequency conversion crystal
Motor adjust, the monitoring of humiture, instruction etc. of transmitting laser.
In present embodiment, the device of laser spatial-intensity shaping is LCD space light modulator.Model
Holoeyeslc2002,600 × 800 pixels, 32 μm of pixel dimension, electrical addressing mode, transmissive operation, write image is 8bit
Gray-scale maps.The measuring apparatus of laser near-field are Scientific Grade ccd, 1024 × 1024 pixels, 13 μm of pixel dimension；Laser system adopts
Image relaying designs, the position image planes each other of the ccd position of fundamental frequency light and frequency tripling light and LCD space light modulator.
Specific embodiment two: with reference to Fig. 1 to Figure 22, present embodiment is described, a kind of three times of laser described in present embodiment
The step of the spatial-intensity shaping methods of frequency is a kind of to generate specifically comprising the following steps that of liquid crystal compensation frequency tripling image
Step (one), original image write liquid crystal, run laser instrument, gather fundamental frequency hot spot and frequency tripling hot spot with ccd；
Step (two), determination measurement fundamental frequency and the ccd of frequency tripling and the spatial correspondence of LCD space light modulator.?
Location hole is write on original image, writes liquid crystal, run laser instrument, observe the change of fundamental frequency ccd and frequency tripling ccd upper Positioning holes
Change, determine the spatial relationship of they and LCD space light modulator, including the anglec of rotation and scaling；
Step (three), fundamental frequency and frequency tripling measure the image procossing of hot spot, including removing background noise, filter measuring system band
The high-frequency noise coming, rotates and scales, and the initial pictures extracting write on fundamental frequency and frequency tripling hot spot, with liquid crystal are with dimension；
Step (four), the preferable light spot image of calculating fundamental frequency light, provide frequency tripling ideal hot spot, brilliant further according to frequency conversion
The nonlinear effect of body and frequency tripling hot spot, are modified to fundamental frequency hot spot, obtain the preferable light spot image of fundamental frequency light；
Step (five), the compensation image of calculating write liquid crystal, the preferable light spot image according to fundamental frequency light and fundamental frequency measurement light
Write liquid crystal initial pictures are linearly revised, are written the compensation image of liquid crystal by speckle.
Other compositions and annexation are identical with specific embodiment one.
Specific embodiment three: with reference to Fig. 1 to Figure 22, present embodiment is described, a kind of three times of laser described in present embodiment
Specifically comprising the following steps that of frequency tripled laser local shaping image is generated in the step 2 of spatial-intensity shaping methods of frequency
Step a, initial pictures write liquid crystal, run laser instrument, gather frequency tripling hot spot with ccd；
Step b, extraction frequency tripling hot spot, if finding out, flux is larger to be done, record position；
Step c, initial pictures correspondence position, write hole, select suitable hole Softening factor, dimension of opening and
Hole depth, generates the image of frequency tripled laser local shaping.
Other compositions and annexation are identical with specific embodiment one.
Embodiment
In conjunction with Fig. 2 to Figure 22 embodiment is described:
Step one, spacing shaping is done to fundamental frequency light, make fundamental frequency light output near field distribution uniformly, write liquid crystal spatial light modulation
The initial pictures of device, the near field before and after output fundamental frequency light compensation, injection fundamental frequency light output near field adjusts system m=1.38:1, m table
Show the ratio of flux peak and average flux in hot spot；
Step 2, measurement frequency tripling output near field, after the completion of fundamental frequency light shaping, write LCD space light modulator image is not
Become, run laser instrument, measurement frequency tripling output laser near-field distribution；
Step 3, determine fundamental frequency light and the spatial correspondence of frequency tripling light ccd and LCD space light modulator, write liquid
On brilliant image, set four location holes, run laser instrument, observe fundamental frequency light and frequency tripling light ccd observes the change of location hole；
Step 4, extract fundamental frequency light and frequency tripling photo measure hot spot, include going background, filtering, rotate and stretch；
Step 5, calculating fundamental frequency light ideal hot spot, provide frequency tripling light ideal hot spot, dimension and write liquid crystal spatial light tune
The image dimension of device processed is identical, by frequency tripling light ideal hot spot, fundamental frequency light and frequency tripling photo measure hot spot, calculates fundamental frequency light reason
Think hot spot；
Step 6, the compensation image of calculating write LCD space light modulator: fundamental frequency light ideal hot spot and fundamental frequency photo measure
Hot spot is different, and the image of write LCD space light modulator will be adjusted, and makes output fundamental frequency hot spot close to fundamental frequency light desired light
Speckle, by the initial pictures of write LCD space light modulator, fundamental frequency light ideal hot spot and fundamental frequency photo measure hot spot, calculates write
The compensation image of LCD space light modulator；
Step 7, will compensate frequency tripling light image write LCD space light modulator, run laser instrument, gather frequency tripling
Light output hot spot；
Step 8, the local shaping of frequency tripling ray laser: using the mode that hole is detained on LCD space light modulator, by three
The high point of local flux in frequency doubled light is subdued, and extracts frequency tripling light output hot spot, corresponding with LCD space light modulator, looks for
If to flux doing more than 90%, detaining hole centered on each point, hole overlapping position presses calculating the deepest.Dimension of opening is
40 pixels (32 μm of pixel), depth is 0.3, and edge Softening factor is 24%；
Step 9, will button hole compensation image write LCD space light modulator, run laser instrument, collection frequency tripling light swash
Light output near-field image.
Claims (2)
1. a kind of laser frequency tripling spatial-intensity shaping methods it is characterised in that: a kind of described space of laser frequency tripling is strong
Degree shaping methods are achieved by the steps of:
Step one, generation liquid crystal compensation frequency tripling image；The steps include:
Step (one), original image write liquid crystal simultaneously run laser instrument, gather fundamental frequency hot spot and frequency tripling hot spot with ccd；
Step (two), determination measurement fundamental frequency and the ccd of frequency tripling and the spatial correspondence of LCD space light modulator, original
Location hole is write on image, writes liquid crystal, run laser instrument, observe the change of fundamental frequency ccd and frequency tripling ccd upper Positioning holes, really
Their spatial relationships with LCD space light modulator fixed, including the anglec of rotation and scaling；
Step (three), fundamental frequency and frequency tripling measure the image procossing of hot spot, including removing background noise, filter what measuring system was brought
High-frequency noise, rotation and scaling, on extraction fundamental frequency and frequency tripling hot spot, with liquid crystal, the initial pictures of write are same ties up；
Step (four), the preferable light spot image of calculating fundamental frequency light, provide frequency tripling ideal hot spot, further according to frequency conversion crystal
Nonlinear effect and frequency tripling hot spot, are modified to fundamental frequency hot spot, obtain the preferable light spot image of fundamental frequency light；
Step (five), the compensation image of calculating write liquid crystal, the preferable light spot image according to fundamental frequency light and fundamental frequency measurement hot spot, right
Write liquid crystal initial pictures are linearly revised, and are written the compensation image of liquid crystal；
Step 2, generation frequency tripled laser local shaping image；
Step 3, complete spatial-intensity shaping.
2. according to claim 1 a kind of laser frequency tripling spatial-intensity shaping methods it is characterised in that: raw in step 2
Become specifically comprising the following steps that of frequency tripled laser local shaping image
Step a, initial pictures write liquid crystal, run laser instrument, gather frequency tripling hot spot with ccd；
Step b, extraction frequency tripling hot spot, if finding out, flux is larger to be done, record position；
Step c, initial pictures correspondence position, write hole, select suitable hole Softening factor, dimension of opening and hole
Depth, generates the image of frequency tripled laser local shaping.
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| CN108296230B (en) * | 2018-02-09 | 2019-06-28 | 中国科学院西安光学精密机械研究所 | A kind of dynamic range laser cleaning method |
| CN108535932A (en) * | 2018-05-30 | 2018-09-14 | 中国工程物理研究院激光聚变研究中心 | The debugging apparatus and adjustment method of a kind of nearly far field light path simultaneously |
| CN110007471B (en) * | 2019-05-22 | 2021-01-05 | 哈尔滨工业大学 | Cascade fuzzy matching shaping system and method for quasi-near-field focusing light beam |
| CN112582871B (en) * | 2020-12-14 | 2022-02-22 | 中国科学院合肥物质科学研究院 | Pulse laser sequence energy correction system and method |
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| US7203210B2 (en) * | 2003-12-29 | 2007-04-10 | The Boeing Company | Methods and devices for forming a high-power coherent light beam |
| WO2006083300A2 (en) * | 2004-06-18 | 2006-08-10 | Massachusetts Institute Of Technology | Acceleration of charged particles using spatially and temporally shaped electromagnetic radiation |
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