CN114414212A - Portable laser beam quality beta factor testing arrangement - Google Patents
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Abstract
The invention relates to a portable laser beam quality beta factor testing device, which comprises the following components in sequence along the direction of a tested laser light path: energy attenuation module A: the energy attenuation module is used for accurately sending the high-energy laser to be detected to the energy attenuation module B after energy attenuation and light path adjustment are carried out on the high-energy laser to be detected; energy attenuation module B: the attenuation sheet is arranged on the mounting bracket in a replaceable way to further attenuate, and the detected laser after further attenuation is output to the beta detection module; a beta detection module: the method is used for detecting the light spot picture of the input laser in real time and obtaining the light beam quality beta factor after obtaining the gray information. Compared with the prior art, the invention has the advantages of modularization, standardization, accurate and real-time detection, simple operation and the like.
Description
Technical Field
The invention relates to the technical field of laser, in particular to a portable laser beam quality beta factor testing device.
Background
Since the first ruby laser emerged, the laser technology was in rapid development, various lasers were also brought out in succession, and the laser has not only wide application in the industrial fields of medical treatment, communication, material processing, laser welding and the like, but also irreplaceable application prospect in military affairs.
In recent years, many developed countries are actively developing high-energy laser light sources, which have many advantagesThe method has the outstanding characteristics of light weight, high efficiency, low cost and the like, plays a very important role in military affairs, the most important evaluation parameter of the high-energy laser source is beam quality, the quality of the index directly influences the energy density and the action time of light spots on a target and further influences the distance of hitting the target and the damage effect, and the existing methods for defining the laser beam quality are many, wherein beta factors and M are2The two methods are widely used at present, which can reflect the essence of the quality of the light beam and the spatial distribution of the light intensity.
The technology adopted by the current light beam quality instrument on the market is basically that light beam profile measurement is carried out by utilizing devices such as a CCD (charge coupled device), a knife edge, a slit and the like, the most important two points are focused light beam measurement and collimated laser measurement, and the accurate value of the light beam quality is obtained through multiple measurements, but the light beam quality detection time of the instrument is long, is close to two minutes and cannot be dynamically detected in real time, and the measurement method is relatively accurate for low power; for high powers, the beam quality at different times is different due to thermal effects, and therefore, there is a particular need for devices that can dynamically detect beam quality in real time.
At present, a device for detecting the quality of a high-energy laser beam by adopting a beta factor does not exist basically, and research work mainly focuses on analyzing the reason for influencing the beta factor and how to improve the accuracy of beta factor calculation, such as analysis of the influence factor of the high-energy laser beam quality beta factor in the literature of Wangbuiru; there are also calibration measurement systems for studying the beam quality beta factor, such as the one disclosed in chinese patent CN104977156A for measuring the beam quality beta factor by CCD far field method; and a calibration method for a beam quality beta factor measuring system disclosed in chinese patent CN108871559A, etc., but the present beam quality detection method or device is basically based on M2According to the working principle, laser is firstly focused and then continuously zoomed, and the quality of light beams is acquired and calculated in the zooming process, but the method cannot realize real-time monitoring and detection of the quality of the light beams, and a system test tool is designed and built by self, so that the method generally does not have standardization, is messy, large in size and very high in cost。
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a portable laser beam quality beta factor testing device.
The purpose of the invention can be realized by the following technical scheme:
a portable laser beam quality beta factor testing device comprises a testing device and a testing device, wherein the testing device is sequentially arranged along the optical path direction of a laser to be tested:
energy attenuation module A: the energy attenuation module is used for accurately sending the high-energy laser to be detected to the energy attenuation module B after energy attenuation and light path adjustment are carried out on the high-energy laser to be detected;
energy attenuation module B: the attenuation sheet is arranged on the mounting bracket in a replaceable way to further attenuate, and the detected laser after further attenuation is output to the beta detection module;
a beta detection module: the method is used for detecting the light spot picture of the input laser in real time and obtaining the light beam quality beta factor after obtaining the gray information.
The energy attenuation module A comprises a mounting platform, and a plurality of groups of emission absorption units and adjusting assemblies which are respectively arranged on the mounting platform along a light path, wherein the plurality of groups of emission absorption units and the adjusting assemblies are all positioned at the same center height.
Each group of emission and absorption units consists of a high-energy reflection assembly and an absorber which are matched with each other, the high-energy reflection assembly consists of a high-energy reflector and an adjusting frame and is used for removing a film according to the wave band of the laser to be detected and reflecting most energy of the laser to be detected into the corresponding absorber, and the number of the high-energy reflection units depends on the energy level of the laser to be detected, the damage threshold value which can be born by the reflection film and the thermal deformation of the lens.
The adjusting component is composed of a reflector and an adjusting frame used for adjusting the pitching angle and the inclination angle of the reflector, and is used for ensuring that the laser to be detected is quickly and accurately debugged into the beta monitoring and detecting module.
The absorber is made of metal materials with high heat conductivity and high heat exchange coefficient, and comprises aluminum alloy and red copper.
And a heat insulation pad is arranged between the absorber and the mounting platform and used for preventing the heat conduction mounting platform from influencing the measurement data, and the heat insulation pad is made of a heat insulation material of polytetrafluoroethylene or POM.
The beta detection module comprises a computer, a platform, a focusing mirror arranged on the platform, a detection camera, a beam splitter and a total reflection mirror, wherein the detection camera, the beam splitter and the total reflection mirror are communicated with the computer through a serial port, the detected laser after further attenuation sequentially passes through the focusing mirror, the beam splitter and the total reflection mirror and then focuses on the detection camera, the detection camera acquires a light spot picture of the detected laser, obtains energy gray scale information and sends the energy gray scale information to the computer for real-time processing to obtain the ratio of the far field divergence angle of the detected laser to the reference diffraction limit angle or the ratio of the far field beam diameter of the detected beam to the far field beam diameter corresponding to the reference beam diffraction limit angle, namely a beam quality beta factor, and the expression is as follows:
wherein alpha isu,realFor the far field divergence angle, alpha, of the measured light beamu,reflFor the diffraction limit angle of the reference beam, du,realIs the power ratio in the barrel, i.e. the far field beam diameter or width of the measured beam, du,refIs the diameter or width of the far field beam corresponding to the diffraction limit angle of the reference beam.
The focusing lens realizes a movable control function through a two-dimensional adjusting frame and a one-dimensional linear displacement table, wherein the two-dimensional adjusting frame is used for adjusting the pitching and rotating motion of the focusing lens, the one-dimensional linear displacement table is used for adjusting the front-back distance of the focusing lens so as to adjust the beta focal length and ensure that an image point is accurately focused on an image surface of a detection camera, and the one-dimensional linear displacement table is composed of a slide rail and a slide block.
The energy attenuation module B and the beta monitoring and detecting module adopt split design or are integrated into a light beam quality beta factor detecting module serving as a standard module.
The device is applied to real-time detection of laser beam quality, convenient adjustment of a laser system, adjustment of multi-channel laser beam combination and integration of a laser guide system as a beam quality feedback module.
Compared with the prior art, the invention has the following advantages:
the invention provides a device for dynamically detecting the quality beta factor of a laser beam in real time based on computer programming.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic structural diagram of the energy attenuation module a.
Fig. 3 is a schematic structural diagram of the energy attenuation module B.
Fig. 4 is a schematic structural diagram of the β monitoring detection module.
Fig. 5 is a structure in which the attenuation module B and the β monitor detection module are integrated.
Description of the drawings
1. The laser detection device comprises a laser to be detected 2, energy attenuation modules A and 3, energy attenuation modules B and 4, a beta detection module 5, an installation platform 6, high-energy reflection assemblies a and 7, high-energy reflection assemblies B and 8, absorbers a and 9, absorbers B and 10, an adjusting assembly 11, an installation support 12, an attenuation sheet 13, a platform and 14, a focusing mirror 15, a detection camera 16, a computer 17, a beam splitter 18 and a total reflection mirror.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
The invention provides a portable laser beam quality beta factor real-time testing device of a high-power laser based on computer programming, which is used for dynamically monitoring the beta factor of a system in real time and is convenient for the assembly and adjustment of a laser system; and as monitoring feedback of the system beam quality, thereby dynamically adjusting in real time; the device also can regard as the detecting instrument of standardized light beam quality beta factor, and the device passes through serial ports based on computer language programming and camera and is connected, realizes the host computer interface, easy operation, and nimble control can real-time accurate detection laser beam beta factor, and the device possesses light in weight, the volume is very little, and is with low costs, portable, not only can use in the laboratory, and integrate easily to the system in, realize more detection and experimental functions.
Example 1
The invention provides a device for dynamically detecting the quality beta factor of a laser beam in real time based on computer programming, which is realized by deeply researching a beam quality detection method of a high-energy laser source instrument or equipment according to the characteristic experiment and analysis of the high-energy laser source instrument or equipment, and is shown in figure 1.
The device integrally comprises three modules, namely: the device mainly comprises an energy attenuation module A2, an energy attenuation module B3 and a beta detection module 4, and is mainly applied to detection of laser beam quality, convenient adjustment of a laser system, adjustment of multi-channel laser beam combination, and a beam quality feedback module in an integrated laser guiding system.
The basic principle of the beta test of the device is as follows:
the beam quality beta factor, namely the ratio of the far-field divergence angle of the detected beam to the reference diffraction limit angle, is connected with a serial port of a camera in the beta testing device based on a computer language program, so that the operation and flexible control of an upper computer are realized, and the beam quality is dynamically detected in real time.
The working process of the device is as follows:
after passing through the energy attenuation module A2 and the energy attenuation module B3, the detected laser 1 is attenuated to weak energy and enters the beta monitoring detection module 4, so that the detection of the real-time dynamic light beam quality beta factor is realized.
As shown in fig. 2, the energy attenuation module a2 has an energy attenuation function, so that most of the energy of the high-energy laser is reflected to the absorber, the output weak light enters the β monitoring and detecting module 4, and the β monitoring and detecting module 4 is prevented, and the module further has a function of adjusting the detected light path, so that the detected laser 1 is precisely debugged and enters the β monitoring and detecting module 4, and the mounting platform 5 mainly integrates the components together and is located at the same center height; the high-energy reflecting assembly a6 and the high-energy reflecting assembly b7 mainly comprise a high-energy reflecting mirror and an adjusting frame, and are used for reflecting most of energy to the absorber a8 and the absorber b9 respectively, the number of the high-energy reflecting assemblies mainly depends on the energy level, the damage threshold value which can be born by a reflecting film, the thermal deformation of a lens and other parameters, the high-energy reflecting mirror is used for removing the film according to the wave band of the laser 1 to be detected, so that most of the energy is reflected to the absorber, and the adjusting frame is mainly convenient for debugging the detected light beam to the absorber; the absorber a8 and the absorber b9 are made of metal materials with high heat conductivity and high heat exchange coefficient, such as aluminum alloy, red copper and the like, and the absorber is mounted on the platform and must have a heat insulation function to prevent the absorber from being influenced by the heat conduction on the mounting platform 5, and the absorber and the mounting platform 5 are connected through a heat insulation pad (the heat insulation pad is made of heat insulation materials such as polytetrafluoroethylene, POM and the like); the adjusting assembly 10 mainly comprises a reflector and an adjusting frame, and has functions of adjusting the pitch and the tilt of the reflector, so as to ensure that the detected light beam is quickly and accurately debugged into the beta monitoring and detecting module 4.
As shown in fig. 3, the energy attenuation module B3 has the function of precisely attenuating energy and the function of adjusting, and is mainly composed of an attenuation sheet 12 and a mounting bracket 11, wherein the mounting bracket 11 can be selected or designed to be automatically switched to facilitate the replacement of the attenuation sheet 12.
The energy attenuation module A2 selects appropriate reflectors according to requirements, the reflectivity of the high-energy reflecting unit is generally 99% -99.9%, the high-energy reflecting unit is mainly coated with a high-reflection film according to the existing optical coating technology level and the energy (generally in the order of μ W or mW) that the beta monitoring detection module 4 can bear is provided, for example, the laser power of the laser 1 to be detected is 1000W, and the attenuation module A2 needs to attenuate by 10-6The output energy is 1mW, and then the attenuation is performed by 10 through an energy attenuation module B3-1～10-3The energy attenuation module B3 is mainly realized by an absorption-type attenuation sheet or a reflection-type attenuation sheet, and ultimately ensures that the laser energy reaching the β monitor detection module 4 is in the μ W or mW level.
As shown in fig. 4, the β monitoring and detecting module 4 mainly functions to dynamically detect the change of the light beam quality β factor in real time, and mainly comprises a platform 13, a focusing mirror 14, a detecting camera 15, a computer 16, a beam splitter 17, and a total reflection mirror 18, the detected laser 1 focuses the incident detected laser 1 on the detecting camera 15 after passing through the focusing mirror 14, the beam splitter 17, and the total reflection mirror 18, and acquires a light spot picture of the detected laser 1 through the detecting camera 15 to obtain energy gray scale information, the computer 16 is connected to the detecting camera 15 through a serial port, and processes the light spot in real time by using a programming algorithm to obtain the light beam quality β factor, that is, a ratio of a far field divergence angle of the detected light beam to a diffraction limit angle of a reference light beam or a ratio of a far field light beam diameter of the detected light beam to a far field light beam diameter corresponding to the diffraction limit angle of the reference light beam, and the specific formula is as follows:
in the formula, alphau,realThe power ratio in the inner barrel is equal to the power ratio in the inner barrel of the diffraction limit angle of the reference beam for the far-field divergence angle of the measured light beam; alpha is alphau,reflFor reference beam diffraction limit angle, power ratio d in bucketu,realThe diameter or width of the far-field beam of the measured light beam is equal to the power ratio in the inner bucket of the diffraction limit angle of the reference beam; du,refThe programming algorithm is based on the above formula theory to realize calculation for the far-field beam diameter or width corresponding to the diffraction limit angle of the reference beam.
The platform 13 integrates the elements of the whole beta monitoring and detecting module 4, so that the debugging and the carrying are convenient; the focusing lens 14 has a movable control function, which is convenient for the calibration test of the device of the invention, and the focusing lens 14 realizes the movable control function through a two-dimensional adjusting frame and a one-dimensional linear displacement table, wherein the two-dimensional adjusting frame is used for adjusting the pitching and rotating motion of the focusing lens 14, the one-dimensional linear displacement table is used for adjusting the front-back distance of the focusing lens 14, so as to adjust the beta focal length and ensure that the image point is accurately focused on the image surface of the detection camera 15, and in the embodiment, the one-dimensional linear displacement table is composed of a slide rail and a slide block.
The detection camera 15 may have a band capable of receiving laser light; the beam splitter 17 mainly splits the detected laser 1 onto the total reflection mirror 18, and then returns to the beam splitter 17, and then the detected laser is reflected onto the detection camera 15 by the beam splitter 17 to complete the focusing function, so that the volume of the device is not increased while the focal length is increased, and the total reflection mirror 18 is used for totally reflecting the detected laser, thereby realizing the total reflection of the light beam.
Example 2
In this embodiment, the energy attenuation module B3 is integrated with the β monitor and detection module 4 to form a new beam quality β factor detection module, which is light, small and highly integrated, and can be used as a standard β factor detection instrument, as shown in fig. 5, and the operation process is the same as that of embodiment 1.
Claims (10)
1. The utility model provides a portable laser beam quality beta factor testing arrangement which characterized in that, the device includes that it sets gradually along surveyed laser light path direction:
energy attenuation module a (2): the energy attenuation module is used for accurately sending the high-energy laser (1) to be detected into the energy attenuation module B (3) after energy attenuation and optical path adjustment;
energy attenuation module B (3): the attenuation sheet (12) which is arranged on the mounting bracket (11) in a replaceable way is used for further attenuation, and the measured laser (1) after further attenuation is output to the beta detection module (4);
β detection module (4): the method is used for detecting the light spot picture of the input laser in real time and obtaining the light beam quality beta factor after obtaining the gray information.
2. The portable laser beam quality beta factor testing device according to claim 1, wherein the energy attenuation module a (2) comprises a mounting platform (5) and a plurality of emission absorption units and adjusting assemblies (10) respectively arranged on the mounting platform (5) along the optical path, and the plurality of emission absorption units and adjusting assemblies (10) are all at the same center height.
3. The portable laser beam quality beta factor testing device according to claim 2, wherein each group of emission and absorption units is composed of a high-energy reflection assembly and an absorber which are matched with each other, the high-energy reflection assembly is composed of a high-energy reflector and an adjusting frame and is used for coating according to the wave band of the laser (1) to be tested and reflecting most energy of the laser (1) to be tested into the corresponding absorber, and the number of the high-energy reflection units depends on the energy level of the laser (1) to be tested, the damage threshold value which can be borne by the reflection film and the thermal deformation of the lens.
4. The portable laser beam quality beta factor testing device according to claim 3, wherein the adjusting component (10) is composed of a reflector and an adjusting frame for adjusting the pitch and tilt angles of the reflector, so as to ensure that the laser (1) to be tested can be quickly and accurately debugged into the beta monitoring detection module (4).
5. The portable laser beam quality beta factor testing device according to claim 3, wherein the absorber is processed from a metal material with high thermal conductivity and high heat exchange coefficient, and comprises aluminum alloy and red copper.
6. The portable laser beam quality beta factor testing device according to claim 3, wherein a heat insulation pad is arranged between the absorber and the mounting platform (5) to prevent the heat conduction on the mounting platform (5) from affecting the measurement data, and the heat insulation pad is made of a heat insulation material such as polytetrafluoroethylene or POM.
7. The portable laser beam quality beta factor testing device according to claim 1, wherein the beta detection module (4) comprises a computer (16), a platform (13), a focusing mirror (14) arranged on the platform (13), a detection camera (15) communicated with the computer (16) through a serial port, a beam splitter (17) and a total reflection mirror (18), the further attenuated laser beam (1) passes through the focusing mirror (14), the beam splitter (17) and the total reflection mirror (18) in sequence and then is focused on the detection camera (15), the detection camera (15) acquires a light spot picture of the laser beam (1) to be tested, energy gray scale information is obtained and sent to the computer (16) for real-time processing to obtain a ratio of a far field divergence angle of the laser beam (1) to be tested to a reference diffraction limit angle or a ratio of a far field beam diameter of the laser beam to be tested to a far field beam diameter corresponding to a reference beam diffraction limit angle, i.e., the beam quality β factor, expressed as:
wherein alpha isu,realFor the far field divergence angle, alpha, of the measured light beamu,reflFor the diffraction limit angle of the reference beam, du,realIs the power ratio in the barrel, i.e. the far field beam diameter or width of the measured beam, du,refIs the diameter or width of the far field beam corresponding to the diffraction limit angle of the reference beam.
8. The portable laser beam quality beta factor testing device according to claim 7, wherein the focusing lens (14) realizes a movable control function through a two-dimensional adjusting frame and a one-dimensional linear displacement table, wherein the two-dimensional adjusting frame is used for adjusting the pitching and rotating motion of the focusing lens (14), the one-dimensional linear displacement table is used for adjusting the front-back distance of the focusing lens (14), so as to adjust the beta focal length and ensure that the image point is accurately focused on the image plane of the detection camera (15), and the one-dimensional linear displacement table is composed of a slide rail and a slide block.
9. The portable laser beam quality beta factor testing device according to claim 1, wherein the energy attenuation module B (3) and the beta monitoring detection module (4) are designed in a split mode or integrated into a beam quality beta factor detection module as a standard module.
10. The portable laser beam quality beta factor testing device according to claim 1, wherein the device is applied to real-time detection of laser beam quality, convenient adjustment of a laser system, adjustment of multi-channel laser beam combination and integration of a laser guide system as a beam quality feedback module.
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|---|---|---|---|---|
| CN115395349A (en) * | 2022-10-27 | 2022-11-25 | 中国航天三江集团有限公司 | Large-aperture laser system and beam quality diagnosis method thereof |
| CN115395349B (en) * | 2022-10-27 | 2023-02-03 | 中国航天三江集团有限公司 | Large-aperture laser system and light beam quality diagnosis method thereof |
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| CN114414212B (en) | 2023-07-04 |
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