CN1740763B - Full-aperture gain measuring instrument - Google Patents
Full-aperture gain measuring instrument Download PDFInfo
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- CN1740763B CN1740763B CN2005100864137A CN200510086413A CN1740763B CN 1740763 B CN1740763 B CN 1740763B CN 2005100864137 A CN2005100864137 A CN 2005100864137A CN 200510086413 A CN200510086413 A CN 200510086413A CN 1740763 B CN1740763 B CN 1740763B
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Abstract
The full-aperture gain measuring instrument consists of a light beam matching telescope, a filtering system, a photoelectric coupling device CCD and a data acquisition, processing and display system, the system adopts a two-dimensional area array CCD to detect the two-dimensional intensity distribution of light intensity signals, and can simultaneously measure the gain and gain distribution in the full aperture of the laser amplifier to be measured. The invention has simple structure, stability and reliability and high measurement precision, can overcome the measurement error caused by the randomness between two adjacent emissions in the experimental process, can simplify the experimental process, accelerate the measurement speed and improve the measurement precision compared with the existing multi-point probe optical gain measurement technology.
Description
Technical field
The present invention relates to a kind of be used for measuring simultaneously measured laser amplifier unified interior gain and gain profiles whole-aperture gain measuring instrument.
Background technology
At present, to the high power solid-state laser amplifier, gain characteristic comprises small signal gain coefficient and two aspects of gain profiles homogeneity.Usually, the size of small-signal coefficient has determined the height of amplifier gain ability, and the homogeneity quality of gain profiles has very big influence to overall output beam quality, but comprises extraction efficiency of near-field beam and gain media energy storage etc.Usually, the ratio of definition shoot laser and incident laser respective coordinates sampled point intensity is Amplifier Gain, be defined as gain in unified peak-to-average rate be small signal gain coefficient.
In the past, multipoint probe photo measure amplifier commonly used was in unified gain, but this method has following defective: (1) measurement data points is few, can't can only measure few zone to the unified measurement of carrying out of light beam; (2) have randomness between adjacent time, measuring accuracy is not high; (3) measuring period long, complicated operation, data processing method is loaded down with trivial details; (4) send out inferior restriction and make the result of measurement can only reflect the approximate trend of gain profiles, can't reflect trickle variation.
Summary of the invention
Technology of the present invention is dealt with problems and is: overcome in the prior art shortcomings such as measuring accuracy is not high, complicated operation, a kind of whole-aperture gain measuring instrument simple to operate and that precision is very high that is suitable for is provided.
Technical solution of the present invention: whole-aperture gain measuring instrument, by the Beam matching system, spectroscope, two filtering systems, two two-dimensional array CCD and two sets of data collections and disposal system are formed, the Beam matching system is transformed into the bore of tested light beam the target surface size of photoelectric coupled device CCD, tell two-beam through spectroscope, in the scope of eliminating parasitic lights through two filtering systems respectively and the strength retrogression of tested light beam can being measured to CCD, measure two two-dimensional intensity distribution by two two-dimensional array CCD then and be converted to electric signal, by the data acquisition and processing (DAP) system measurement data is transferred to computing machine from CCD at last laser beam, the grey scale signal that CCD detects is to the conversion of light intensity, remove the noise of data and the validation verification of data, finishing image boundary extraction and image alignment and calculated gains distributes, small signal gain coefficient and relevant parameter.
The present invention compared with prior art has following advantage:
(1) the present invention can realize the measurement to unified gain profiles and small signal gain coefficient, overcome in the prior art can only measuring beam in the gain profiles of base point and the deficiency of small signal gain coefficient.
(2) the present invention can once realize the measurement to unified light distribution, overcome in the prior art once the gain profiles of a point in can only light beam and the deficiency that small signal gain coefficient distributes, avoided the deficiency of the complexity of measuring respectively, loaded down with trivial details, inefficiency.
(3) the present invention can realize the more measurement of the interior light distribution of small scale scope, because the pixel of photoelectric coupled device CCD is very small and pixel is a lot, therefore can measure gain profiles and small signal gain coefficient in the space scale that is equivalent to the Pixel Dimensions size, and existing method adopts light pencil as probe light, its space scale is far longer than the CCD pixel size behind matching system, so the present invention can overcome the not high shortcoming of prior art spatial resolution.
(4) the present invention has higher sensitivity, and can the detecting of CCD received joule energy of level, and existing measuring technique multipurpose energy calorimeter carries out energy measurement, can only detect the energy of millijoule level, and its sensitivity is much smaller than CCD.
(5) the present invention can overcome between the existing method adjacent time because the measuring error that the randomness of factors such as noise causes improves measuring accuracy.
(6) the present invention can improve measuring accuracy, because existing measuring technique multipurpose energy calorimeter is measured energy, with respect to 2 D photoelectric coupled apparatus CCD, energy calorimeter precision is not high.
Description of drawings
Fig. 1 is a theory of constitution block diagram of the present invention;
Fig. 2 is a beam size matching system schematic diagram of the present invention;
Fig. 3 is a data acquisition hardware block diagram of the present invention;
Fig. 4 is the software processes process flow diagram of data acquisition and processing (DAP) of the present invention system.
Embodiment
As shown in Figure 1, the present invention is by Beam matching system 1, spectroscope 2, two filtering systems 3, two two-dimensional array CCD 4, two data collections and disposal system 5 are formed, Beam matching system 1 is transformed into the bore of tested light beam the target surface size of photoelectric coupled device CCD4, tell two-beam through spectroscope 2, respectively through two filtering systems 3 with in the scope of eliminating parasitic light and the strength retrogression of tested light beam can being measured to CCD, measure two two-dimensional intensity distribution by two two-dimensional array CCD4 then and be converted to electric signal laser beam, be input to data acquisition and processing (DAP) system 5 at last and handle, data acquisition and processing (DAP) system 5 finishes measurement data is transferred to computing machine from CCD, the grey scale signal that CCD detects is to the conversion of light intensity, remove the noise of data and the validation verification of data, finishing image boundary extraction and image alignment and calculated gains distributes, small signal gain coefficient and relevant parameter.
As shown in Figure 2, beam size matching system 1 is mainly finished measured beam size equal proportion adjusted to and is not more than CCD target surface size so that survey, and it is made of the lens of two confocal some D and d.
As shown in Figure 3, data acquisition and processing (DAP) system 5 is by part of data acquisition and data processing division divisional processing, wherein part of data acquisition is by finishing (type of data collecting card is different because of CCD's) with the data collecting card of CCD coupling, and data processing section mainly is made of the software processes program in the computing machine.When measurement light source is pulsed light, during work, CCD, computing machine are in the external synchronization signal state of waiting for always, receive after the external synchronization signal, CCD begins exposure, computing machine time-delay a period of time is transferred to computing machine by capture card with data after waiting for the CCD end exposure, has so far just finished the collection of one-period.
Be illustrated in figure 4 as the data processing section of invention.Because what CCD measured is the relative distribution of laser energy, and output is gray-scale value, so the scaling method of CCD input-output light transfer characteristic, linear dynamic range, is the key technique of this measurement light intensity.Core technology of the present invention promptly is to adopt two-dimensional array CCD that the two-dimensional intensity distribution of laser beam is converted to electric signal, carry out data processing by computing machine, processing procedure arrives the conversion of energy and five main processes of image alignment of two-way through data acquisition, removal noise, edge extracting and gray scale successively, as shown in Figure 4, remove noise process measured data are separated into signal and noise, this process is finished by software, divide two steps: at first remove singular value, deduct the background noise (replacing with the dark current corresponding gray usually) of system then; Edge extracting is used for determining the physical location and the size of hot spot, and this process is mainly finished according to priori jointing edge extraction algorithm (extracting the border of square region etc. such as available first order difference); Gray scale converts actual energy to the grey scale signal that CCD is responded that converts of energy, this process is demarcated the light transfer characteristic of CCD in advance at needs, method commonly used has little diffraction by aperture, promptly according to laser behind the aperture diffraction in focal plane energy distribution theory characteristics as can be known, select hole diameter in conjunction with the size of CCD target surface, the focal length of condenser lens, the factors such as wavelength of Calibration of Laser, make CCD abundant sampled point be arranged, according to the zero level of input the CCD energy distribution of composing and the output gray level value nominal light electroresponse curve of sampling to the zero level spectrum of diffraction pattern; Last image alignment with the ratio of outgoing beam and incident beam corresponding region, is the gain in this zone, the gain of a lot of regional formation faces and gain profiles, and image alignment mode commonly used has: positioning feature point and pattern match.
When the present invention is used for the gain measurement of continuous light, only need the frequency gathering and handle just can finish measurement to light distribution greater than the change frequency of measurand, this process has also reflected the variation of light distribution.When the present invention is used for the gain measurement of paired pulses light, also need external synchronization signal to determine that the sequential relationship between light and the acquisition system can collect pulsed optical signals with assurance CCD, all the other are with the measurement of continuous light.
The present invention utilizes CCD as light intensity detector, CCD is made of a lot of trickle pixels, and what each valid pixel was finished is luminous intensity measurement, and the corresponding point of outgoing and incident are to removing the gain measurement of just finishing this point, just form the difference of gain height on whole, promptly finished the measurement of gain profiles.
The present invention can calculate corresponding parameter according to the gain of measuring, such as average gain:
Degree of modulation:
Homogeneity:
Deng.
When the present invention is used for different wave length, such as ultraviolet, just need the CCD of selection work wavelength in the corresponding region, all the other hardware, software algorithm are adjusted accordingly and can realize the gain of different wave length (ultraviolet is to infrared) and the measurement of gain profiles simultaneously.
Claims (3)
1. whole-aperture gain measuring instrument, it is characterized in that: it is by the Beam matching system, spectroscope, two filtering systems, two two-dimensional array CCD and two sets of data collections and disposal system are formed, the Beam matching system is transformed into the bore of tested light beam the target surface size of photoelectric coupled device CCD, tell two-beam through spectroscope, in the scope of eliminating parasitic lights through two filtering systems respectively and the strength retrogression of tested light beam can being measured to CCD, the two-dimensional intensity distribution of measuring laser beam by two two-dimensional array CCD is converted to electric signal then, finish by the data acquisition and processing (DAP) system at last measurement data is transferred to computing machine from CCD, the grey scale signal that CCD detects is to the conversion of light intensity, remove the noise of data and the validation verification of data, finish image boundary and extract and image alignment, calculated gains distributes and small signal gain coefficient;
Described data acquisition and processing (DAP) system is embodied as: after two-dimensional array CCD is converted to electric signal with the two-dimensional intensity distribution of laser beam, carry out data processing by computing machine, processing procedure is for removing noise, edge extracting, gray scale to the conversion of energy and the image alignment of two-way, remove noise process measured data separating is become signal and noise, divide two steps: at first remove singular value, deduct the background noise of system then; Edge extracting is used for determining the physical location and the size of hot spot; Gray scale converts actual energy to the grey scale signal that CCD is responded that converts of energy; Last image alignment with the ratio of outgoing beam and incident beam corresponding region, is the gain in this zone.
2. whole-aperture gain measuring instrument according to claim 1 is characterized in that: described Beam matching system is made of two confocal lens.
3. whole-aperture gain measuring instrument according to claim 1 is characterized in that: the wavelength coverage of described tested light beam from ultraviolet to infrared.
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| CN2005100864137A CN1740763B (en) | 2005-09-13 | 2005-09-13 | Full-aperture gain measuring instrument |
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| CN2005100864137A CN1740763B (en) | 2005-09-13 | 2005-09-13 | Full-aperture gain measuring instrument |
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| CN1740763B true CN1740763B (en) | 2011-08-31 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2380579Y (en) * | 1999-05-25 | 2000-05-31 | 中国科学院力学研究所 | Real-time displaying diagnosis apparatus for crystal growth course |
| CN1295232A (en) * | 2000-07-24 | 2001-05-16 | 长春师凯科技产业有限责任公司 | Guidance method and device capable of resisting interference of strong light |
| CN1464288A (en) * | 2002-06-05 | 2003-12-31 | 中国科学技术大学 | Particle field total-field measurement process and apparatus based on laser sheet optical image-forming |
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- 2005-09-13 CN CN2005100864137A patent/CN1740763B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2380579Y (en) * | 1999-05-25 | 2000-05-31 | 中国科学院力学研究所 | Real-time displaying diagnosis apparatus for crystal growth course |
| CN1295232A (en) * | 2000-07-24 | 2001-05-16 | 长春师凯科技产业有限责任公司 | Guidance method and device capable of resisting interference of strong light |
| CN1464288A (en) * | 2002-06-05 | 2003-12-31 | 中国科学技术大学 | Particle field total-field measurement process and apparatus based on laser sheet optical image-forming |
Non-Patent Citations (1)
| Title |
|---|
| JP特开平7-333234A 1995.12.22 |
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