CN112130337B - Synchronous control system and method for phase and inclined phase of fiber laser array piston - Google Patents
Synchronous control system and method for phase and inclined phase of fiber laser array piston Download PDFInfo
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Abstract
A synchronous control system and method for the piston phase and the tilt phase of a fiber laser array are disclosed, wherein a high-speed camera is used for detecting an interference fringe image generated after a reference light and a shrunk fiber laser array are overlapped and interfered at a target surface of the high-speed camera, the interference fringe image is subjected to beam separation according to a neutron beam of the fiber laser array, the piston phase error and the tilt phase error of each unit beam are obtained according to the distribution condition of fringes in each separated sub-beam area, and then control signals of each phase modulator and a respective adaptive fiber collimator are generated, so that the tilt phase and the piston phase of all the sub-lasers are controlled to be respectively consistent with the tilt phase and the piston phase of the reference light, the corresponding phase modulators and the respective adaptive fiber collimators are driven, and the synchronous control of the tilt phase and the piston phase is realized. The invention realizes the decoupling of the tilt phase error and the piston phase error from the optical level and further improves the synthesis efficiency of coherent synthesis.
Description
Technical Field
The invention relates to the technical field of fiber laser coherent synthesis, in particular to a phase control system and a phase control method for carrying out real-time inclination and piston synchronous locking on a fiber laser array by adopting a high-speed camera.
Background
The laser array coherent synthesis technology is one of important methods for obtaining high-power laser and maintaining high beam quality, and can be widely applied to the fields of laser communication, phased array laser radar and the like.
The fiber laser coherent combining system is mostly realized by using a main oscillator power amplification structure, a laser array comes from the same path of seed laser to ensure coherence between light beams, but because the laser array respectively experiences different optical paths, piston phases between the sub light beams are greatly different. In addition, since the emission devices between the sub-beams are independent of each other, the exit optical axes have a tilt error from each other. In the field of coherent synthesis, errors of a piston phase and an inclined phase of a laser array are main factors which cause reduction of a synthesis effect and reduction of brightness of a synthesized light spot, so that in a coherent synthesis system, a closed-loop control system is adopted to correct the piston phase and the inclined phase in real time and maintain the beam quality of a synthesized light beam.
FIG. 1 is a schematic diagram of a fiber laser array phase and tilt closed loop control system previously used by the applicant. The system is designed based on a Master Oscillator Power Amplifier (MOPA) structure, and comprises a seed optical fiber laser 101, an optical fiber beam splitter 102, a plurality of phase modulators 103, a plurality of optical fiber amplifiers 104, a plurality of adaptive optical fiber collimators 105, a laser beam combiner 106, a piston phase control system 107 and an inclined phase control system 108. The core idea of the system is to separate the inclination and the piston into a closed loop to realize the implementation and correction of the phase error of the piston and the inclination phase. However, the system does not fundamentally remove the coupling relationship between the tilt phase and the piston phase, and the control strategy is to use the different characteristic frequencies of the tilt phase noise and the piston phase noise, so that the control characteristic of the piston phase is not greatly influenced in the control process, but the coupling effect between the two phase noises influences the control effect of the phase control system in a large array element fiber laser control system or a strong noise environment, so that the phase-locked system scheme shown in fig. 1 is not suitable for being used as a fiber laser array to simultaneously control the tilt and the piston phase of the laser array under a strong noise condition.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a novel system and a method for synchronously controlling the phase and the inclined phase of a fiber laser array piston. The invention realizes synchronous control of the tilt phase of the fiber laser array and the piston phase based on the high-speed camera, realizes decoupling of tilt phase error and piston phase error from an optical level, completes system design of synchronous high-frequency control of the tilt phase error and the piston phase error by using only one optical parameter detection device, namely the high-speed camera, and further improves the synthesis efficiency of coherent synthesis.
In order to achieve the technical purpose, the invention adopts the following specific technical scheme:
the system for synchronously controlling the phase and the inclined phase of the piston of the fiber laser array comprises a seed laser, a laser beam splitter, a fiber phase modulator, a laser amplifier, a laser beam expanding collimator, a self-adaptive fiber collimator, a beam splitter and a sampling control unit;
the seed laser outputs seed laser; the laser beam splitter is a 1 x (N +1) array laser beam splitter and divides seed laser into N +1 sub-lasers, wherein the N paths of sub-lasers are used for MOPA structure coherent synthesis output, and the 1 path of sub-lasers are used as reference light;
n optical fiber phase modulators are provided, N output ends of N paths of sub-lasers output by the laser beam splitter are respectively connected with one optical fiber phase modulator, and the N optical fiber phase modulators are respectively used for locking piston phases of the N paths of sub-lasers;
the number of the laser amplifiers is N +1, wherein the N laser amplifiers are connected to the output end of the optical fiber phase modulator and amplify the sub laser output by the optical fiber phase modulator; the output end of the laser beam splitter for outputting the reference light is connected with a laser amplifier for amplifying the reference light, and the amplified reference light is input into a laser beam expanding collimator for expanding and collimating the reference light so that the size of the reference light is matched with the size of a target surface of a high-speed camera;
n self-adaptive optical fiber collimators are arranged in an array to form a self-adaptive optical fiber collimator array and output an optical fiber laser array; the self-adaptive optical fiber collimators are respectively connected behind the N laser amplifiers corresponding to the N beams of sub-lasers and used for locking the inclined phases of the N beams of sub-lasers output by the laser beam splitter;
a spectroscope is arranged on the light path of the fiber laser array, most of the power of the fiber laser array is reflected to an action target, and a small part of the transmitted fiber laser array is used for a sampling control system; the sampling control unit comprises a laser beam reducer, a high-speed camera and an image acquisition and phase control module, reference light is input into the high-speed camera after passing through the laser beam expanding collimator, an optical fiber laser array transmitted by the beam splitter is also incident into the high-speed camera after passing through the laser beam reducer, the optical fiber laser array and the reference light are overlapped and interfered at the target surface of the high-speed camera, and the high-speed camera captures an interference fringe image of the reference light and the optical fiber laser array; the phase control module collects and processes interference fringe image information output by the high-speed camera to realize synchronous control of the tilt phase and the piston phase.
Specifically, the phase control module calculates the piston phase error of each path of sub laser and the reference light at the high-speed camera according to the interference fringe image information, generates a control signal and outputs the control signal to each phase modulator, calculates the tilt phase error of each path of sub laser and the reference light according to the interference fringe image information, generates a control signal and outputs the control signal to each adaptive optical fiber collimator, and generates control signals of each phase modulator and each adaptive optical fiber collimator, so that the tilt phase and the piston phase of all sub lasers are respectively controlled to be consistent with the tilt phase and the piston phase of the reference light.
Preferably, the laser beam reducer comprises a large-caliber long-focus aplanatic convex lens and a small-caliber short-focus aplanatic convex lens, a Keplerian telescope system is formed by the two lenses, the beam reduction ratio is the ratio of the focal lengths of the two lenses, and the beam reduction ratio is determined according to the ratio of the diameter of an circumscribed circle of the N adaptive optical fiber collimator arrays to the size of a target surface of a high-speed camera.
Preferably, the output power of the laser amplifier for amplifying the reference light is adjustable, and the amplified reference light is required to be equivalent to the power density of the probe light of the fiber laser array on the target surface of the high-speed camera so as to generate an interference fringe image with high contrast.
Preferably, the spectroscope is a high-reflectivity spectroscope, and after being subjected to light splitting by the spectroscope, the laser energy is output in a reflection mode of > 99%, and the laser energy is output to the sampling control system in a transmission mode of < 1%.
In the synchronous control system for the piston phase and the tilt phase of the fiber laser array, a high-speed camera is used for detecting an interference fringe image generated after a reference light and a shrunk fiber laser array are overlapped and interfered at a target surface of the high-speed camera, the interference fringe image is used for carrying out beam separation on the interference fringe according to a fiber laser array neutron beam, and the piston phase error and the tilt phase error of each unit beam are obtained according to the distribution condition of the fringe in each separated sub-beam area. And generating control signals of each phase modulator and each adaptive optical fiber collimator according to the calculated piston phase error and tilt phase error of each unit beam, so that the tilt phases and the piston phases of all the sub-lasers are controlled to be respectively consistent with the tilt phase and the piston phase of the reference light, and the corresponding phase modulators and the adaptive optical fiber collimators are driven to realize synchronous control of the tilt phases and the piston phases.
The invention utilizes a high-speed camera to detect the light intensity distribution I of interference light spots generated by a reference light beam and a shrunk fiber laser arrayinterferometricThe interference fringes are subjected to beam separation according to the optical fiber laser array sub-beams, the distance between the fringes of each separated sub-beam and extreme value position information are calculated, the piston phase error and the inclination phase error of each unit beam are obtained through calculation, and the piston phase error and the inclination phase error obtained through calculation are subjected to closed-loop control through a control system, so that a synchronous control system of the piston phase and the inclination phase of the optical fiber laser array is formed. The inventionThe beneficial effects are as follows:
the invention combines the inclined phase resolving system and the piston phase resolving system into a whole, and solves the defects of redundancy of control modules and complex working modes of the traditional phase control system.
The invention adopts a one-step control system, so that the control system is highly integrated and is convenient to transplant and debug in practical application.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic diagram of a fiber laser array phase and tilt closed loop control system previously employed by applicants;
FIG. 2 is a schematic diagram of the optical path structure of the present invention;
FIG. 3 shows the spot shapes of the light collected by the high-speed camera in different states according to an embodiment;
fig. 4 is a diagram illustrating the spot shape of the interference fringes of the unit light beams collected by the high-speed camera and the situation that the center positions of the spots of the interference fringes are respectively used for obtaining the one-dimensional light intensity distribution along the x axis and the y axis in one embodiment.
Detailed Description
In order to make the technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1:
referring to fig. 2, the present embodiment provides a fiber laser array piston phase and tilt phase synchronous control system, which includes a seed laser 201, a laser beam splitter 202, a fiber phase modulator 203, a laser amplifier 204, a laser beam expanding collimator 205, an adaptive fiber collimator 206, a laser beam combiner 207, a beam splitter 208, and a sampling control unit. The sampling control unit includes a laser beam reducer 209, a high-speed camera 210, and an image acquisition and phase control module 211. The number of the fiber phase modulators 203 and the number of the adaptive fiber collimators 206 are both N, and the number of the laser beam expanding collimators 205 is 1. The number of the laser beam combiners 207 is 1. There are N +1 laser amplifiers 204. Wherein N is an integer and N is not less than 2.
The seed laser 201 is connected to the input of a laser beam splitter 202. The laser beam splitter is a 1 × (N +1) array laser beam splitter, and the laser beam splitter 202 has N +1 output terminals. The seed laser output by the seed laser 201 is divided into N +1 sub-lasers by the laser beam splitter 202, and the N +1 sub-lasers are respectively output from N +1 output ends of the laser beam splitter 202. The N paths of sub-lasers are used for MOPA structure coherent synthesis output, and the 1 path of sub-lasers are used as reference light.
The ith output end of the laser beam splitter 202 is optically connected with the ith optical fiber phase modulator 203, and the i is 1, …, and the N optical fiber phase modulators are respectively used for locking the piston phases of the N paths of sub-lasers. The output end of the ith fiber phase modulator 203 is optically connected to the ith laser amplifier 204, and amplifies the sub-laser output by the fiber phase modulator.
The number of the adaptive fiber collimators 206 is N, and the N are arranged in an array to form an adaptive fiber collimator array and output a fiber laser array. The output end of the ith laser amplifier 204 is connected to the optical path of the ith adaptive fiber collimator, and the N adaptive fiber collimators are respectively used for locking the tilt phases of the N sub-lasers output by the laser beam splitter. The ith adaptive fiber collimator 206 is configured to collimate the laser light output by the ith laser amplifier 204 and provide a tilt phase correction function, where the laser light output by the respective adaptive fiber collimators 206 is linearly polarized laser light and has the same polarization direction.
The (N +1) th output end of the laser beam splitter 202 outputs reference light, the (N +1) th output end of the laser beam splitter 202 is connected with the (N +1) th laser amplifier to amplify the reference light, and the amplified reference light is input into the laser beam expanding collimator 205 for expanding and collimating the reference light, so that the size of the reference light is matched with the size of the target surface of the high-speed camera 210.
A laser beam combiner 207 and a beam splitter 208 are arranged on the light path of the fiber laser array output by the adaptive fiber collimator array. The laser beam combiner 207 makes the input fiber laser array output to the beam splitter with a high duty cycle optical path. The spectroscope 208 is a high-reflectivity spectroscope, and after being split by the spectroscope 208, 99% of laser energy is reflected and output, and < 1% of laser energy is transmitted and output to the sampling control system.
The reference light is input to the high-speed camera 210 through the laser beam expanding collimator 205, and the fiber laser array transmitted by the beam splitter 208 is also input to the high-speed camera 210 through the laser beam reducer 209. The laser beam reducer 209 reduces the spot radius of the input low power fiber laser array and outputs the reduced spot radius to the target surface of the high speed camera 210.
The fiber laser array and the reference light coincide and interfere at the target surface of the high-speed camera 210, and the high-speed camera 210 captures an interference fringe image of the reference light and the fiber laser array. The phase control module 211 collects the interference fringe image information output by the high-speed camera 210, and according to the interference fringe image information, resolves the piston phase difference between the ith sub-laser and the reference light and the tilt phase difference between the ith sub-laser and the reference light at the high-speed camera, generates a control signal and outputs the control signal to the ith phase modulator, compensates the piston phase difference phi of the ith sub-laser, and outputs the control signal to the ith phase modulatoriI ═ 1,2, …, N; generating a control signal and outputting the control signal to the ith adaptive optical fiber collimator to compensate the tilt phase difference mu of the ith path of sub-laseriV and viAnd i is 1,2, …, N, so as to realize synchronous control of the tilt phase and the piston phase.
The laser beam reducer 209 comprises a large-caliber long-focus aplanatic convex lens and a small-caliber short-focus aplanatic convex lens, a Keplerian telescope system is formed by the two lenses, the beam reduction ratio is the ratio of the focal lengths of the two lenses, and the beam reduction ratio is determined according to the ratio of the diameter of an outer circle of the N adaptive optical fiber collimator arrays to the size of a target surface of the high-speed camera.
The output power of the laser amplifier 204 for amplifying the reference light is adjustable, and the amplified reference light is required to be equivalent to the power density of the probe light of the fiber laser array on the target surface of the high-speed camera so as to generate an interference fringe image with high contrast.
The control method of the fiber laser array piston phase and tilt phase synchronous control system comprises the following steps:
step 1, taking out one path of laser as a reference beam after seed laser passes through a laser beam splitter, enabling the reference beam to serve as a 'scale' for inverting a tilt phase error of a fiber laser array and a piston phase error, and independently amplifying the rest N beams of the seed laser after passing through a laser beam splitter based on an MOPA structure;
step 2, after the N beams of sub-laser pass through the self-adaptive optical fiber collimator array, one part of the sub-laser is reflected by a high-reflection mirror to act on a target, and the other part of the sub-laser is used as a sampling beam for beam control;
step 3, enabling the size of the emergent light beam of the self-adaptive optical fiber collimator array to be reduced to the size of the imaging target surface of the high-speed camera by the sampling light beam through the beam reducing system, adjusting the position of the high-speed camera to enable beam reducing laser to be vertically incident, and starting the high-speed camera to capture the laser spot pattern shown in the figure 3 (a);
step 5, simultaneously starting the reference light and the N paths of sub-lasers, and adjusting the incident angle of the reference light incident to the high-speed camera until an interference fringe image shown in the figure 3(c) appears;
and 6, calculating the error between the tilt phase and the piston phase of each sub laser beam and the reference light in the fiber laser array according to the interference fringe image acquired by the high-speed camera, controlling the tilt phase and the piston phase of all the sub lasers to be respectively consistent with the tilt phase and the piston phase of the reference laser according to the 'scale' action of the reference laser, and controlling each sub laser to be tilt and output in the same phase of the piston according to the transmissibility of equal sign.
For the fiber laser array with the total aperture of the emitting surface as D, the optical field distribution of the emitting surface is as follows:
wherein (x, y) is the coordinates of the emitting surface, N is the number of unit beams included in the array, d is the light passing diameter of the unit beams, and (x)j,yj)、φj,、μjV and vjThe center coordinate, the piston phase, the x-direction tilt phase and the y-direction tilt phase of the jth unit beam, respectively.
After k times of non-spherical-difference laser beam-reducing device, the optical field distribution of the fiber laser array has the same form as formula (1), except that d and (x) in formula (1)j,yj) The conjugate light spot of the emitting surface of the fiber laser array detected by the amplitude equal-scale magnification high-speed camera is shown in fig. 3(a), and the light field distribution is as follows:
after the reference light passes through the laser beam expanding collimator without spherical aberration, the reference light spot detected by the high-speed camera is as shown in fig. 3(b), and the light field distribution is as follows:
wherein, (x, y) is the coordinate of the detection surface of the high-speed camera, w is the beam width of the reference light, and phi is the piston phase error of the reference light.
The reference light and the shrunk fiber laser array are overlapped and interfered at the target surface of the high-speed camera, and the generated interference fringe image is detected by the high-speed camera, as shown in fig. 3(c), the light field distribution of the interference fringe image is the linear addition of the formula (2) and the formula (3):
the tilt phase and piston phase error of each unit beam can be obtained according to the distribution of the fringes in each unit beam area.
Example 2:
in the fiber laser array piston phase and tilt phase synchronous control system provided in embodiment 1, a high-speed camera is used to detect an interference fringe image generated after a reference light and a shrunk fiber laser array coincide and interfere with each other on a target surface of the high-speed camera, and the interference fringe image is used to perform beam separation on interference fringes according to a fiber laser array neutron beam.
And obtaining the piston phase error and the inclination phase error of each unit beam according to the distribution condition of the fringes in each separated sub-beam area. Referring to fig. 4, fig. 4(a) is a spot shape diagram of unit beam interference fringes collected by a high-speed camera in an embodiment. The central position of the interference fringe light spot in fig. 4(a) is respectively taken as the one-dimensional light intensity distribution along the x and y axes, as shown in fig. 4(b) and fig. 4 (c). As can be derived from equation (4), the x-direction tilt phase error of the jth unit beam can be calculated from the x-direction fringe spacing:
wherein, deltax,jThe x-direction fringe spacing of the interference fringe light spot corresponding to the j unit light beam, k is the wave vector of the laser light beam, murefFor tilting the phase, μ, in the x-direction of the reference beamjThe phase is tilted for the jth unit beam x direction.
Similarly, the y-direction tilt phase error of the jth unit beam can be calculated from the y-direction fringe spacing:
wherein, deltay,jThe y-direction fringe spacing, v, of the interference fringe light spot corresponding to the jth unit light beamrefThe phase is tilted for the y-direction of the reference beam.
According to the calculated x-direction inclined phase error and y-direction inclined phase error of the jth unit light beam, and the position coordinates of the extreme value of the interference fringes, the piston phase error of the jth unit light beam can be calculated:
wherein x ismaxIs the x-direction fringe maximum coordinate, ymaxIs the y-direction fringe maximum coordinate.
And generating control signals of each phase modulator and each adaptive optical fiber collimator according to the calculated piston phase error and tilt phase error of each unit beam, so that the tilt phases and the piston phases of all the sub-lasers are controlled to be respectively consistent with the tilt phase and the piston phase of the reference light, and the corresponding phase modulators and the adaptive optical fiber collimators are driven to realize synchronous control of the tilt phases and the piston phases.
In summary, although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention.
Claims (7)
1. A synchronous control method for a piston phase and an inclined phase of an optical fiber laser array is characterized by comprising the steps of building a synchronous control system for the piston phase and the inclined phase of the optical fiber laser array, wherein the synchronous control system for the piston phase and the inclined phase of the optical fiber laser array comprises a seed laser, a laser beam splitter, an optical fiber phase modulator, a laser amplifier, a laser beam expanding collimator, a self-adaptive optical fiber collimator, a beam splitter and a sampling control unit, and the sampling control unit comprises a laser beam reducer, a high-speed camera and an image acquisition and phase control module;
the seed laser outputs seed laser; the laser beam splitter is a 1 x (N +1) array laser beam splitter and divides seed laser into N +1 sub-lasers, wherein the N paths of sub-lasers are used for MOPA structure coherent synthesis output, and the 1 path of sub-lasers are used as reference light;
n optical fiber phase modulators are provided, N output ends of N paths of sub-lasers output by the laser beam splitter are respectively connected with one optical fiber phase modulator, and the N optical fiber phase modulators are respectively used for locking piston phases of the N paths of sub-lasers;
the number of the laser amplifiers is N +1, wherein the N laser amplifiers are connected to the output end of the optical fiber phase modulator and amplify the sub laser output by the optical fiber phase modulator; the output end of the laser beam splitter for outputting the reference light is connected with a laser amplifier for amplifying the reference light, and the amplified reference light is input into a laser beam expanding collimator for expanding and collimating the reference light so that the size of the reference light is matched with the size of a target surface of a high-speed camera;
n self-adaptive optical fiber collimators are arranged in an array to form a self-adaptive optical fiber collimator array and output an optical fiber laser array; the self-adaptive optical fiber collimators are respectively connected behind the N laser amplifiers corresponding to the N beams of sub-lasers and used for locking the inclined phases of the N beams of sub-lasers output by the laser beam splitter;
a spectroscope is arranged on the light path of the fiber laser array, most of the power of the fiber laser array is reflected to an action target, and a small part of the transmitted fiber laser array is used for a sampling control system; the reference light is input into the high-speed camera after passing through the laser beam expanding collimator, the fiber laser array transmitted by the beam splitter is also incident into the high-speed camera after passing through the laser beam reducer, the fiber laser array and the reference light are overlapped and interfered at the target surface of the high-speed camera, and the high-speed camera captures an interference fringe image of the reference light and the fiber laser array; the phase control module collects and processes interference fringe image information output by the high-speed camera;
in a synchronous control system of the piston phase and the tilt phase of the fiber laser array, a high-speed camera is utilized to detect an interference fringe image generated after a reference light and a shrunk fiber laser array are superposed and interfered at a target surface of the high-speed camera, the interference fringe image is used for carrying out beam separation on the interference fringe according to a fiber laser array neutron beam, and the piston phase error and the tilt phase error of each unit beam are obtained according to the distribution condition of fringes in each separated sub-beam area; generating control signals of a phase modulator and an adaptive optical fiber collimator corresponding to each unit beam in the fiber laser array piston phase and tilt phase synchronous control system according to the calculated piston phase error and tilt phase error of each unit beam, so that the tilt phase and the piston phase of all the sub-lasers are controlled to be respectively consistent with the tilt phase and the piston phase of the reference light, driving the corresponding phase modulator and the adaptive optical fiber collimator to realize synchronous control of the tilt phase and the piston phase, wherein the method for obtaining the piston phase error and the tilt phase error of each unit beam according to the distribution condition of the stripes in each separated sub-beam region comprises the following steps:
and respectively acquiring the one-dimensional light intensity distribution condition of the central position of the interference fringe light spot in each sub-beam region along the x axis and the y axis, wherein the x-direction inclination phase error of the jth unit beam can be obtained by calculating the x-direction fringe distance:
wherein, deltax,jThe x-direction fringe spacing of the interference fringe light spot corresponding to the j unit light beam, k is the wave vector of the laser light beam, murefFor tilting the phase, μ, in the x-direction of the reference beamjTilting the phase for the x direction of the jth unit beam;
the y-direction tilt phase error of the jth unit beam can be calculated from the y-direction fringe spacing:
wherein, deltay,jThe y-direction fringe spacing, v, of the interference fringe light spot corresponding to the jth unit light beamrefTilting the phase for the y-direction of the reference beam;
according to the calculated x-direction inclined phase error and y-direction inclined phase error of the jth unit light beam, and the position coordinates of the extreme value of the interference fringes, the piston phase error of the jth unit light beam can be calculated:
wherein x ismaxIs the x-direction fringe maximum coordinate, ymaxIs the y-direction fringe maximum coordinate.
2. The method for synchronously controlling the phase and the tilt phase of the fiber laser array piston according to claim 1, wherein: the laser beam reducer comprises a large-caliber long-focus spherical aberration elimination convex lens and a small-caliber short-focus spherical aberration elimination convex lens, a Keplerian telescope system is formed by the two lenses, the beam reduction ratio is the ratio of the focal lengths of the two lenses, and the beam reduction ratio is determined according to the ratio of the diameter of an circumscribed circle of the N self-adaptive optical fiber collimator arrays to the size of a target surface of the high-speed camera.
3. The method for synchronously controlling the phase and the tilt phase of the fiber laser array piston according to claim 1, wherein: the output power of the laser amplifier used for amplifying the reference light is adjustable, and the amplified reference light is required to be equivalent to the power density of the detection light of the fiber laser array on the target surface of the high-speed camera so as to generate an interference fringe image with high contrast.
4. The method for synchronously controlling the phase and the tilt phase of the fiber laser array piston according to claim 1, wherein: the spectroscope is a high-reflectivity spectroscope, 99% of laser energy is reflected and output after being subjected to light splitting by the spectroscope, and < 1% of laser energy is transmitted and output to the sampling control system.
5. The fiber laser array piston phase and tilt phase synchronous control method according to claim 1,2, 3 or 4, characterized in that: n is more than or equal to 2.
6. The method for synchronously controlling the phase and the tilt phase of the fiber laser array piston according to claim 5, wherein: the laser light output by the optical fiber collimators respectively suitable for the optical fiber collimators is linearly polarized laser light, and the polarization directions of the laser light are the same.
7. The method for synchronously controlling the phase and the tilt phase of the fiber laser array piston according to claim 5, wherein: the self-adaptive optical fiber collimator further comprises a laser beam combiner, wherein the laser beam combiner is arranged on the light path of the optical fiber laser array output by the self-adaptive optical fiber collimator array, and the input optical fiber laser array is output to the spectroscope through the high-duty-cycle light path by the laser beam combiner.
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| CN113885228B (en) * | 2021-09-30 | 2024-05-14 | 中国人民解放军国防科技大学 | Distributed all-fiber laser phased array system and phase control method thereof |
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