CN112130337B - Fiber laser array piston phase and tilt phase synchronization control system and method - Google Patents
Fiber laser array piston phase and tilt phase synchronization control system and method Download PDFInfo
- Publication number
- CN112130337B CN112130337B CN202011096233.8A CN202011096233A CN112130337B CN 112130337 B CN112130337 B CN 112130337B CN 202011096233 A CN202011096233 A CN 202011096233A CN 112130337 B CN112130337 B CN 112130337B
- Authority
- CN
- China
- Prior art keywords
- phase
- fiber
- laser
- tilt
- piston
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000000835 fiber Substances 0.000 title claims abstract description 130
- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000003044 adaptive effect Effects 0.000 claims abstract description 38
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 14
- 230000003287 optical effect Effects 0.000 claims abstract description 14
- 238000003786 synthesis reaction Methods 0.000 claims abstract description 14
- 230000001427 coherent effect Effects 0.000 claims abstract description 10
- 230000001360 synchronised effect Effects 0.000 claims abstract description 6
- 238000005070 sampling Methods 0.000 claims description 13
- 239000003638 chemical reducing agent Substances 0.000 claims description 11
- 230000004075 alteration Effects 0.000 claims description 7
- 230000003321 amplification Effects 0.000 claims description 6
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 6
- 101100456571 Mus musculus Med12 gene Proteins 0.000 claims description 5
- 230000009467 reduction Effects 0.000 claims description 5
- 238000003491 array Methods 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 3
- 238000002310 reflectometry Methods 0.000 claims description 3
- 239000000523 sample Substances 0.000 claims description 3
- 230000010287 polarization Effects 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 6
- 238000012937 correction Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002054 transplantation Methods 0.000 description 1
Images
Classifications
-
- 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
- G02B27/10—Beam splitting or combining systems
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mechanical Light Control Or Optical Switches (AREA)
- Instruments For Measurement Of Length By Optical Means (AREA)
Abstract
光纤激光阵列活塞相位与倾斜相位同步控制系统及方法,利用高速相机探测参考光与缩束后的光纤激光阵列在高速相机的靶面处重合并发生干涉后所产生的干涉条纹图像,将干涉条纹图像按照光纤激光阵列中子光束进行光束分离,根据分离出的每一个子光束区域内条纹的分布情况,得到各单元光束的活塞相位误差和倾斜相位误差,进而生成各相位调制器和各自适应光纤准直器的控制信号,使得所有子激光的倾斜相位、活塞相位控制到分别与参考光的倾斜相位、活塞相位一致,驱动对应的相位调制器与自适应光纤准直器,实现倾斜相位与活塞相位的同步控制。本发明实现了从光学层次上倾斜相位误差与活塞相位误差的解耦,进一步提升了相干合成的合成效率。
The fiber laser array piston phase and tilt phase synchronization control system and method use a high-speed camera to detect the interference fringe image generated by the overlap of the reference light and the beam-reduced fiber laser array at the target surface of the high-speed camera and interfere, and the interference fringes The image is divided according to the sub-beams in the fiber laser array. According to the distribution of fringes in each sub-beam area, the piston phase error and tilt phase error of each unit beam are obtained, and then each phase modulator and each adaptive fiber are generated. The control signal of the collimator makes the tilt phase and piston phase of all sub-lasers be controlled to be consistent with the tilt phase and piston phase of the reference light respectively, and drives the corresponding phase modulator and adaptive fiber collimator to realize the tilt phase and piston phase. Synchronous control of the phase. 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 the coherent synthesis.
Description
技术领域technical field
本发明涉及光纤激光相干合成技术领域,特别是涉及一种采用高速相机对光纤激光阵列进行实时倾斜与活塞同步锁定的相位控制系统及方法。The invention relates to the technical field of fiber laser coherent synthesis, in particular to a phase control system and method for using a high-speed camera to perform real-time tilt and piston synchronization locking on a fiber laser array.
背景技术Background technique
激光阵列相干合成技术是获得高功率激光同时保持高的光束质量的重要方法之一,可以广泛应用于激光通信、相控阵激光雷达等领域。Laser array coherent synthesis technology is one of the important methods to obtain high-power laser while maintaining high beam quality, and can be widely used in laser communication, phased array lidar and other fields.
光纤激光相干合成系统多使用主振荡器功率放大结构实现,激光阵列来自于同一路种子激光以保证光束之间的相干性,但是由于激光阵列分别经历了不同光程,子光束之间的活塞相位大相径庭。另外由于子光束之间的发射装置彼此独立,因此出射光轴彼此存在倾斜误差。在相干合成领域,激光阵列的活塞相位与倾斜相位误差是导致合成效果下降、引起合成光斑亮度降低的主要因素,因此在相干合成系统中,要采用闭环控制系统对活塞相位与倾斜相位进行实时矫正,保持合成光束的光束质量。The fiber laser coherent synthesis system is mostly realized by the main oscillator power amplification structure. The laser array comes from the same seed laser to ensure the coherence between the beams. However, because the laser arrays experience different optical paths, the piston phase between the sub-beams Very different. In addition, since the emitting devices between the sub-beams are independent of each other, the outgoing optical axes have tilt errors with each other. In the field of coherent synthesis, the piston phase and tilt phase errors of the laser array are the main factors that lead to the decline of the synthesis effect and the reduction of the brightness of the synthesis spot. Therefore, in the coherent synthesis system, a closed-loop control system should be used to correct the piston phase and the tilt phase in real time. , maintaining the beam quality of the composite beam.
图1为申请人之前采用的一种光纤激光阵列相位与倾斜闭环控制系统的结构示意图。该系统是基于主振荡器功率放大(英文名称为Master Oscillator Power Amplifier,简称MOPA)结构设计,由种子光纤激光器101、光纤分束器102、多个相位调制器103、多个光纤放大器104、多个自适应光纤准直器105、激光合束器106、活塞相位控制系统107、倾斜相位控制系统108组成。通过该系统的核心思想是将倾斜与活塞分离闭环,实现活塞相位与倾斜相位误差的实施矫正。但是该系统没有从根本上解除倾斜相位与活塞相位的耦合关系,在控制策略上是使用倾斜相位噪声与活塞相位噪声的特征频率不同,使得在控制过程中,活塞相位的控制特性没有受到太大影响,但是在大阵元光纤激光控制系统或者强噪声环境下,两种相位噪声之间的耦合效应将影响相位控制系统的控制效果,因此图1所示的锁相系统方案不适合作为光纤激光阵列在强噪声条件下同时控制激光阵列的倾斜与活塞相位。FIG. 1 is a schematic structural diagram of a fiber laser array phase and tilt closed-loop control system previously adopted by the applicant. The system is designed based on the master oscillator power amplifier (English name is Master Oscillator Power Amplifier, MOPA for short), and consists of a
发明内容SUMMARY OF THE INVENTION
针对现有技术存在的缺陷,本发明提出了一种新的光纤激光阵列活塞相位与倾斜相位同步控制系统及方法。本发明基于高速相机实现光纤激光阵列倾斜相位与活塞相位同步控制方,采用本发明实现了从光学层次上倾斜相位误差与活塞相位误差的解耦,完成了只使用一个光学参数探测器件——高速相机就完成倾斜相位误差与活塞相位误差的同步高频控制的系统设计,进一步提升了相干合成的合成效率。Aiming at the defects existing in the prior art, the present invention proposes a new fiber laser array piston phase and tilt phase synchronization control system and method. The invention realizes the synchronization control method of the fiber laser array tilt phase and the piston phase based on the high-speed camera. The invention realizes the decoupling of the tilt phase error and the piston phase error from the optical level, and completes the use of only one optical parameter detection device—high speed The camera completes the system design of synchronous high-frequency control of tilt phase error and piston phase error, which further improves the synthesis efficiency of coherent synthesis.
为实现上述技术目的,本发明采用的具体技术方案如下:For realizing the above-mentioned technical purpose, the concrete technical scheme that the present invention adopts is as follows:
光纤激光阵列活塞相位与倾斜相位同步控制系统,包括种子激光器、激光分束器、光纤相位调制器、激光放大器、激光扩束准直器、自适应光纤准直器、分光镜、采样控制单元;Fiber laser array piston phase and tilt phase synchronization control system, including seed laser, laser beam splitter, fiber phase modulator, laser amplifier, laser beam expander collimator, adaptive fiber collimator, beam splitter, sampling control unit;
种子激光器输出种子激光;激光分束器为1×(N+1)阵列激光分束器,将种子激光分为N+1个子激光,其中N路子激光用于MOPA结构相干合成输出,1路子激光用作参考光;The seed laser outputs the seed laser; the laser beam splitter is a 1×(N+1) array laser beam splitter, which divides the seed laser into N+1 sub-lasers, of which N sub-lasers are used for MOPA structure coherent synthesis output, and 1 sub-laser is used for output. used as reference light;
光纤相位调制器有N个,激光分束器输出的N路子激光的N个输出端分别连接一个光纤相位调制器,N个光纤相位调制器分别用于锁定N路子激光的活塞相位;There are N fiber phase modulators, the N output ends of the N sub-lasers output by the laser beam splitter are respectively connected to a fiber phase modulator, and the N fiber phase modulators are respectively used to lock the piston phases of the N sub-lasers;
激光放大器有N+1个,其中N个激光放大器连接在光纤相位调制器的输出端,对光纤相位调制器输出的子激光进行放大;激光分束器输出参考光的输出端连接一个激光放大器,对参考光进行放大,放大后的参考光输入到激光扩束准直器,用于参考光的扩束与准直,使得参考光的尺寸与高速相机的靶面尺寸相匹配;There are N+1 laser amplifiers, of which N laser amplifiers are connected to the output end of the fiber phase modulator to amplify the sub-lasers output by the fiber phase modulator; the output end of the laser beam splitter output reference light is connected to a laser amplifier, The reference light is amplified, and the amplified reference light is input to the laser beam expander collimator for beam expansion and collimation of the reference light, so that the size of the reference light matches the target surface size of the high-speed camera;
自适应光纤准直器有N个,呈阵列排布,形成自适应光纤准直器阵列,输出光纤激光阵列;N束子激光对应的N个激光放大器之后均分别连接一个自适应光纤准直器,N个自适应光纤准直器分别用于锁定激光分束器输出的N束子激光的倾斜相位;There are N adaptive fiber collimators, which are arranged in an array to form an adaptive fiber collimator array and output a fiber laser array; N laser amplifiers corresponding to the N beams of sub-lasers are connected to an adaptive fiber collimator respectively, The N adaptive fiber collimators are respectively used to lock the tilt phase of the N beams of sub-lasers output by the laser beam splitter;
光纤激光阵列的光路上设置有分光镜,将光纤激光阵列的大部分功率反射到作用目标,并将小部分透射出的光纤激光阵列用于采样控制系统;采样控制单元包括激光缩束器、高速相机和图像采集及相位控制模块,参考光经激光扩束准直器后输入到高速相机,经分光镜透射出的光纤激光阵列经激光缩束器后也入射到高速相机,光纤激光阵列和参考光在高速相机的靶面处重合并发生干涉,高速相机捕获参考光与光纤激光阵列的干涉条纹图像;相位控制模块对高速相机输出的干涉条纹图像信息进行采集和处理,实现倾斜相位与活塞相位的同步控制。The optical path of the fiber laser array is provided with a beam splitter, which reflects most of the power of the fiber laser array to the target, and uses a small part of the transmitted fiber laser array for the sampling control system; the sampling control unit includes a laser beam reducer, a high-speed Camera and image acquisition and phase control module, the reference light is input to the high-speed camera after passing through the laser beam expander and collimator, and the fiber laser array transmitted by the beam splitter is also incident to the high-speed camera, the fiber laser array and the reference beam after passing through the laser beam reducer. The light overlaps and interferes at the target surface of the high-speed camera. The high-speed camera captures the interference fringe image of the reference light and the fiber laser array; the phase control module collects and processes the interference fringe image information output by the high-speed camera to realize the tilt phase and the piston phase. synchronization control.
具体地,相位控制模块根据干涉条纹图像信息解算出高速相机处各路子激光与参考光的活塞相位误差,并生成控制信号输出到各个相位调制器,并根据干涉条纹图像信息解算出各路子激光与参考光的倾斜相位误差,并生成控制信号输出到各个自适应光纤准直器,生成各相位调制器和各自适应光纤准直器的控制信号,使得所有子激光的倾斜相位、活塞相位控制到分别与参考光的倾斜相位、活塞相位一致。Specifically, the phase control module calculates the piston phase error between each sub-laser and the reference light at the high-speed camera according to the information of the interference fringe image, generates a control signal and outputs it to each phase modulator, and calculates the difference between each sub-laser and the reference light according to the information of the interference fringe image. The tilt phase error of the reference light is generated, and the control signal is generated and output to each adaptive fiber collimator, and the control signal of each phase modulator and each adaptive fiber collimator is generated, so that the tilt phase and piston phase of all sub-lasers are controlled to the respective Consistent with the tilt phase and piston phase of the reference beam.
优选地,本发明激光缩束器包括一个大口径的长焦消球差凸透镜与一个小口径短焦消球差凸透镜,由两个透镜构成开普勒式望远镜系统,缩束比为两个透镜焦距之比,根据N个自适应光纤准直器阵列的外接圆直径与高速相机靶面尺寸的比值确定。Preferably, the laser beam reducer of the present invention includes a large-diameter long-focus aspheric aberration convex lens and a small-diameter short-focus aspheric aberration convex lens, the two lenses constitute a Kepler telescope system, and the beam reduction ratio is two lenses. The ratio of focal lengths is determined according to the ratio of the diameter of the circumscribed circle of the N adaptive fiber collimator arrays to the target surface size of the high-speed camera.
优选地,用于参考光放大的激光放大器的输出功率可调,要求放大后的参考光与光纤激光阵列的探测光在高速相机靶面上功率密度相当,以生成衬比度高的干涉条纹图像。Preferably, the output power of the laser amplifier used for reference light amplification is adjustable, and the power density of the amplified reference light and the probe light of the fiber laser array is required to be comparable on the target surface of the high-speed camera, so as to generate an interference fringe image with high contrast. .
优选地,所述分光镜为高反射率分光镜,经分光镜分光后>99%的激光能量反射输出,<1%的激光能量透射输出到采样控制系统。Preferably, the beam splitter is a high reflectivity beam splitter. After being split by the beam splitter, >99% of the laser energy is reflected and output, and <1% of the laser energy is transmitted and output to the sampling control system.
本发明提供一种光纤激光阵列活塞相位与倾斜相位同步控制方法,在上述光纤激光阵列活塞相位与倾斜相位同步控制系统中,利用高速相机探测参考光与缩束后的光纤激光阵列在高速相机的靶面处重合并发生干涉后所产生的干涉条纹图像,将干涉条纹图像将干涉条纹按照光纤激光阵列中子光束进行光束分离,根据分离出的每一个子光束区域内条纹的分布情况,得到各单元光束的活塞相位误差和倾斜相位误差。根据计算得到的各单元光束的活塞相位误差和倾斜相位误差生成各相位调制器和各自适应光纤准直器的控制信号,使得所有子激光的倾斜相位、活塞相位控制到分别与参考光的倾斜相位、活塞相位一致,驱动对应的相位调制器与自适应光纤准直器,实现倾斜相位与活塞相位的同步控制。The invention provides a fiber laser array piston phase and tilt phase synchronization control method. In the fiber laser array piston phase and tilt phase synchronization control system, a high-speed camera is used to detect the reference light and the beam-reduced fiber laser array in the high-speed camera. The interference fringe image is generated after the target surface overlaps and interferes. The interference fringe image is divided into beams according to the sub-beams in the fiber laser array. According to the distribution of the fringes in each sub-beam area, the Piston phase error and tilt phase error for unit beams. The control signals of each phase modulator and each adaptive fiber collimator are generated according to the calculated piston phase error and tilt phase error of each unit beam, so that the tilt phase and piston phase of all sub-lasers are controlled to the tilt phase of the reference beam respectively. The phase of the piston is consistent, and the corresponding phase modulator and the adaptive fiber collimator are driven to realize the synchronous control of the tilt phase and the piston phase.
本发明利用高速相机探测参考光束与缩束后的光纤激光阵列所产生的干涉光斑光强分布Iinterferometric,将干涉条纹按照光纤激光阵列子光束进行光束分离,将分离出的每一个子光束的条纹的间距与极值位置信息进行运算,计算得到各单元光束的的活塞相位误差与倾斜相位误差,将计算得到的活塞相位误差与倾斜相位误差经过控制系统进行闭环控制,从而构成了光纤激光阵列的活塞相位与倾斜相位的同步控制系统。本发明的有益效果如下:The present invention utilizes the high-speed camera to detect the interference spot light intensity distribution I interferometric generated by the reference beam and the beam-reduced fiber laser array, separates the interference fringes according to the fiber laser array sub-beams, and separates the fringes of each sub-beam from the The distance and extremum position information are calculated, and the piston phase error and tilt phase error of each unit beam are calculated, and the calculated piston phase error and tilt phase error are closed-loop controlled by the control system, thus forming a fiber laser array. Synchronous control system for piston phase and tilt phase. The beneficial effects of the present invention are as follows:
本发明将倾斜相位解算与活塞相位解算系统合二为一,解决了传统相位控制系统控制模块冗余且工作模式复杂的不足。The present invention combines the tilt phase calculation and the piston phase calculation system into one, and solves the problems of redundant control modules and complex working modes of the traditional phase control system.
本发明采用一步式控制系统,使得控制系统高度集成,在实际应用中方便移植与调试。The present invention adopts a one-step control system, which makes the control system highly integrated, and is convenient for transplantation and debugging in practical application.
附图说明Description of drawings
为了更清楚地说明本发明实施例或现有技术中的技术方案,下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍,显而易见地,下面描述中的附图仅仅是本发明的一些实施例,对于本领域普通技术人员来讲,在不付出创造性劳动的前提下,还可以根据这些附图示出的结构获得其他的附图。In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can also be obtained according to the structures shown in these drawings without creative efforts.
图1为申请人之前采用的一种光纤激光阵列相位与倾斜闭环控制系统的结构示意图;1 is a schematic structural diagram of a fiber laser array phase and tilt closed-loop control system adopted by the applicant before;
图2为本发明的光路结构示意图;Fig. 2 is the optical path structure schematic diagram of the present invention;
图3为一实施例中高速相机采集到的不同状态下的光斑形态;FIG. 3 is a light spot shape in different states collected by a high-speed camera in an embodiment;
图4为一实施例中高速相机采集到的单元光束干涉条纹的光斑形态以及将其干涉条纹光斑的中心位置处分别沿x,y轴获取一维光强分布情况图。FIG. 4 is a diagram of the spot shape of the interference fringes of a unit beam collected by a high-speed camera in an embodiment, and a one-dimensional light intensity distribution diagram obtained by taking the center positions of the interference fringes spots along the x and y axes respectively.
具体实施方式Detailed ways
为了使本发明的技术方案及优点更加清楚明白,以下结合附图及实施例,对本发明进行进一步详细说明。应当理解,此处所描述的具体实施例仅用于解释本发明,并不用于限定本发明。In order to make the technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.
实施例1:Example 1:
参照图2,本实施例提供一种光纤激光阵列活塞相位与倾斜相位同步控制系统,包括种子激光器201、激光分束器202、光纤相位调制器203、激光放大器204、激光扩束准直器205、自适应光纤准直器206、激光合束器207、分光镜208、采样控制单元。采样控制单元包括激光缩束器209、高速相机210和图像采集及相位控制模块211。其中光纤相位调制器203和自适应光纤准直器206的数量均为N个,激光扩束准直器205的数量为1个。激光合束器207的数量为1个。激光放大器204有N+1个。其中N为整数且N≥2。2 , this embodiment provides a fiber laser array piston phase and tilt phase synchronization control system, including a
种子激光器201与激光分束器202的输入端连接。激光分束器为1×(N+1)阵列激光分束器,激光分束器202有N+1个输出端。种子激光器201输出的种子激光被激光分束器202分为N+1路子激光,分别从激光分束器202的N+1个输出端输出。其中N路子激光用于MOPA结构相干合成输出,1路子激光用作参考光。The
所述激光分束器202的第i输出端与第i个光纤相位调制器203光路连接,i=1,…,N,N个光纤相位调制器分别用于锁定N路子激光的活塞相位。第i个光纤相位调制器203的输出端与第i个激光放大器204光路连接,对光纤相位调制器输出的子激光进行放大。The ith output end of the
自适应光纤准直器206有N个,呈阵列排布,形成自适应光纤准直器阵列,输出光纤激光阵列。第i个激光放大器204的输出端与第i个自适应光纤准直器光路连接,N个自适应光纤准直器分别用于锁定激光分束器输出的N束子激光的倾斜相位。第i个自适应光纤准直器206用于将第i个激光放大器204输出的激光进行准直并提供倾斜相位矫正功能,各自适应光纤准直器206输出的激光为线偏振激光,且偏振方向相同。There are N
激光分束器202的第N+1输出端输出参考光,激光分束器202的第N+1输出端与第N+1个激光放大器连接,对参考光进行放大,放大后的参考光输入到激光扩束准直器205,用于参考光的扩束与准直,使得参考光的尺寸与高速相机210的靶面尺寸相匹配。The N+1th output end of the
自适应光纤准直器阵列输出的光纤激光阵列的光路上设置有激光合束器207和分光镜208。激光合束器207使输入的光纤激光阵列以高占空比光路输出到分光镜。所述分光镜208为高反射率分光镜,经分光镜208分光后>99%的激光能量反射输出,<1%的激光能量透射输出到采样控制系统。A
参考光经激光扩束准直器205后输入到高速相机210,经分光镜208透射出的光纤激光阵列经激光缩束器209后也入射到高速相机210。激光缩束器209使输入的低功率光纤激光阵列的光斑半径减小后再输出至高速相机210的靶面。The reference light is input to the high-
光纤激光阵列和参考光在高速相机210的靶面处重合并发生干涉,高速相机210捕获参考光与光纤激光阵列的干涉条纹图像。相位控制模块211对高速相机210输出的干涉条纹图像信息进行采集,并根据干涉条纹图像信息解算出高速相机处第i路子激光与参考光的活塞相差以及第i路子激光与参考光的倾斜相差,并生成控制信号输出到第i个相位调制器,补偿第i路子激光的活塞相差φi,i=1,2,…,N;并生成控制信号输出到第i个自适应光纤准直器,补偿第i路子激光的倾斜相差μi和νi,i=1,2,…,N,实现倾斜相位与活塞相位的同步控制。The fiber laser array and the reference light overlap and interfere at the target surface of the high-
激光缩束器209包括一个大口径的长焦消球差凸透镜与一个小口径短焦消球差凸透镜,由两个透镜构成开普勒式望远镜系统,缩束比为两个透镜焦距之比,根据N个自适应光纤准直器阵列的外接圆直径与高速相机靶面尺寸的比值确定。The
用于参考光放大的激光放大器204的输出功率可调,要求放大后的参考光与光纤激光阵列的探测光在高速相机靶面上功率密度相当,以生成衬比度高的干涉条纹图像。The output power of the
上述光纤激光阵列活塞相位与倾斜相位同步控制系统的控制方法如下:The control method of the above-mentioned fiber laser array piston phase and tilt phase synchronization control system is as follows:
步骤1,将种子激光经过激光分束器后取出一路激光作为参考光束,使其作为反演光纤激光阵列倾斜相位误差与活塞相位误差的“标尺”,其余N束子激光经过激光分束器的激光基于MOPA结构独立放大;Step 1: Pass the seed laser through the laser beam splitter and take out one laser beam as a reference beam, which is used as a "ruler" for the inversion of the fiber laser array tilt phase error and piston phase error, and the remaining N beams of sub-lasers pass through the laser beam splitter. Independent amplification based on MOPA structure;
步骤2,N束子激光经过自适应光纤准直器阵列后,一部分经过高反镜反射作用于目标,另一部分透射光作为采样光束用于光束控制;Step 2, after the N beams of sub-lasers pass through the adaptive fiber collimator array, a part of the sub-laser is reflected by a high-reflection mirror and acts on the target, and the other part of the transmitted light is used as a sampling beam for beam control;
步骤3,采样光束首先通过缩束系统,使得自适应光纤准直器阵列的出射光束尺寸缩小到高速相机其成像靶面的尺寸大小,调节高速相机位置,使得缩束激光垂直入射,此时开启高速相机,可以捕获到如图3(a)所示的激光光斑图样;Step 3, the sampling beam first passes through the beam reduction system, so that the size of the outgoing beam of the adaptive fiber collimator array is reduced to the size of the imaging target surface of the high-speed camera, and the position of the high-speed camera is adjusted so that the beam-reduced laser is vertically incident, and it is turned on at this time. A high-speed camera can capture the laser spot pattern shown in Figure 3(a);
步骤4,参考光经过激光放大器后进行功率放大,之后经过带有扩束功能的激光扩束准直器进行光束准直,使得光束的尺寸也与高速相机的靶面尺寸匹配,单独开启参考光,高速相机所捕获到的激光光斑图样如图3(b)所示;Step 4: The reference light goes through the laser amplifier for power amplification, and then passes through the laser beam expander collimator with beam expander function for beam collimation, so that the size of the beam also matches the size of the target surface of the high-speed camera, and the reference light is turned on separately. , the laser spot pattern captured by the high-speed camera is shown in Figure 3(b);
步骤5,同时开启参考光与N路子激光,调节参考光入射高速相机的入射角度,直至出现图3(c)所示干涉条纹图像;Step 5: Turn on the reference light and the N-channel sub-lasers at the same time, and adjust the incident angle of the reference light incident on the high-speed camera until the interference fringe image shown in FIG. 3(c) appears;
步骤6,按照高速相机采集到的干涉条纹图像,计算光纤激光阵列中的每一束子激光与参考光的倾斜相位与活塞相位误差,根据参考激光的“标尺”作用,将所有子激光的倾斜相位、活塞相位控制到分别与参考激光的倾斜相位、活塞相位一致,根据等号的传递性,就可以分别将每一个子激光控制为倾斜与活塞的同相位输出。Step 6, according to the interference fringe image collected by the high-speed camera, calculate the tilt phase and piston phase error between each sub-laser and the reference light in the fiber laser array, and calculate the tilt phase of all sub-lasers according to the "ruler" of the reference laser. , the piston phase is controlled to be consistent with the tilt phase of the reference laser and the piston phase, respectively. According to the transferability of the equal sign, each sub-laser can be controlled to output the same phase of the tilt and the piston respectively.
对于发射面总口径为D的光纤激光阵列,发射面的光场分布为:For a fiber laser array with a total diameter of emission surface D, the light field distribution on the emission surface is:
其中,(x,y)为发射面坐标,N为阵列包含的单元光束数目,d为单元光束的通光直径,(xj,yj)、φj,、μj和νj分别为第j个单元光束的中心坐标、活塞相位、x方向倾斜相位和y方向倾斜相位。Among them, (x, y) are the coordinates of the emitting surface, N is the number of unit beams contained in the array, d is the clear diameter of the unit beam, (x j , y j ), φ j , μ j and ν j are the th Center coordinates, piston phase, x-direction tilt phase, and y-direction tilt phase of the j unit beams.
经过k倍的无球差激光缩束器后,光纤激光阵列的光场分布具有式(1)一样的形式,只是将式(1)中的d与(xj,yj)等比例缩小,振幅等比例放大高速相机探测到光纤激光阵列发射面的共轭光斑如图3(a)所示,其光场分布如下:After k times the spherical aberration-free laser beam reducer, the optical field distribution of the fiber laser array has the same form as formula (1), except that d in formula (1) is proportionally reduced to (x j , y j ), The conjugate light spot on the emission surface of the fiber laser array detected by the high-speed camera with proportionally amplified amplitude is shown in Figure 3(a), and its light field distribution is as follows:
参考光经过无球差激光扩束准直器后,高速相机探测到参考光斑如图3(b)所示,其光场分布如下:After the reference light passes through the non-spherical aberration laser beam expander collimator, the high-speed camera detects the reference spot as shown in Figure 3(b), and its light field distribution is as follows:
其中,(x,y)为高速相机探测面坐标,w为参考光的束宽,φ为参考光的活塞相位误差。Among them, (x, y) is the coordinates of the detection surface of the high-speed camera, w is the beam width of the reference light, and φ is the piston phase error of the reference light.
参考光与缩束后的光纤激光阵列在高速相机的靶面处重合并发生干涉,所产生的干涉条纹图像经由高速相机探测到的如图3(c)所示,其光场分布为式(2)与式(3)的线性相加:The reference light and the beam-reduced fiber laser array overlap and interfere at the target surface of the high-speed camera, and the resulting interference fringe image detected by the high-speed camera is shown in Figure 3(c). 2) Linear addition to equation (3):
根据每个单元光束区域内条纹的分布情况,可以得到该单元光束的倾斜相位与活塞相位误差。According to the distribution of fringes in each unit beam area, the tilt phase and piston phase errors of the unit beam can be obtained.
实施例2:Example 2:
本实施例提供一种光纤激光阵列活塞相位与倾斜相位同步控制方法,在实施例1所提供的光纤激光阵列活塞相位与倾斜相位同步控制系统中,利用高速相机探测参考光与缩束后的光纤激光阵列在高速相机的靶面处重合并发生干涉后所产生的干涉条纹图像,将干涉条纹图像将干涉条纹按照光纤激光阵列中子光束进行光束分离。This embodiment provides a fiber laser array piston phase and tilt phase synchronization control method. In the fiber laser array piston phase and tilt phase synchronization control system provided in Embodiment 1, a high-speed camera is used to detect the reference light and the beam-reduced fiber The interference fringe image is generated after the laser array overlaps and interferes at the target surface of the high-speed camera, and the interference fringe image is separated according to the neutron beam of the fiber laser array.
根据分离出的每一个子光束区域内条纹的分布情况,得到各单元光束的活塞相位误差和倾斜相位误差。参照图4,其中图4(a)为一实施例中高速相机采集到的单元光束干涉条纹的光斑形态图。将图4(a)中的干涉条纹光斑的中心位置处分别沿x,y轴获取一维光强分布情况,分别如图4(b)和图4(c)所示。通过式(4)可以推得,第j个单元光束的x方向倾斜相位误差可由x方向条纹间距计算得出:According to the distribution of fringes in each sub-beam area separated, the piston phase error and tilt phase error of each unit beam are obtained. Referring to FIG. 4 , FIG. 4( a ) is a light spot shape diagram of a unit beam interference fringe collected by a high-speed camera in an embodiment. The one-dimensional light intensity distribution is obtained at the center of the interference fringe spot in Fig. 4(a) along the x and y axes, respectively, as shown in Fig. 4(b) and Fig. 4(c). It can be deduced from equation (4) that the tilt phase error in the x-direction of the j-th unit beam can be calculated from the fringe spacing in the x-direction:
其中,δx,j为第j个单元光束对应的干涉条纹光斑的x方向条纹间距,k为激光光束的波矢,μref为参考光束x方向倾斜相位,μj为第j个单元光束x方向倾斜相位。where δx ,j is the fringe spacing in the x direction of the interference fringe spot corresponding to the jth unit beam, k is the wave vector of the laser beam, μref is the tilt phase of the reference beam in the x direction, μj is the jth unit beam x Direction tilt phase.
同理可得,第j个单元光束的y方向倾斜相位误差可由y方向条纹间距计算得出:Similarly, the y-direction tilt phase error of the jth unit beam can be calculated from the y-direction fringe spacing:
其中,δy,j为第j个单元光束对应的干涉条纹光斑的y方向条纹间距,νref为参考光束y方向倾斜相位。Among them, δ y,j is the fringe spacing in the y direction of the interference fringe spot corresponding to the jth unit beam, and ν ref is the tilt phase of the reference beam in the y direction.
根据计算得到的第j个单元光束的x方向倾斜相位误差和y方向倾斜相位误差,结合干涉条纹极值的位置坐标,可计算第j个单元光束的活塞相位误差:According to the calculated x-direction tilt phase error and y-direction tilt phase error of the j-th unit beam, combined with the position coordinates of the extremum of the interference fringe, the piston phase error of the j-th unit beam can be calculated:
其中,xmax为x方向条纹极大值坐标,ymax为y方向条纹极大值坐标。Among them, x max is the maximum value coordinate of the stripe in the x direction, and y max is the maximum value coordinate of the stripe in the y direction.
根据计算得到的各单元光束的活塞相位误差和倾斜相位误差生成各相位调制器和各自适应光纤准直器的控制信号,使得所有子激光的倾斜相位、活塞相位控制到分别与参考光的倾斜相位、活塞相位一致,驱动对应的相位调制器与自适应光纤准直器,实现倾斜相位与活塞相位的同步控制。The control signals of each phase modulator and each adaptive fiber collimator are generated according to the calculated piston phase error and tilt phase error of each unit beam, so that the tilt phase and piston phase of all sub-lasers are controlled to the tilt phase of the reference beam respectively. The phase of the piston is consistent, and the corresponding phase modulator and the adaptive fiber collimator are driven to realize the synchronous control of the tilt phase and the piston phase.
综上所述,虽然本发明已以较佳实施例揭露如上,然其并非用以限定本发明,任何本领域普通技术人员,在不脱离本发明的精神和范围内,当可作各种更动与润饰,因此本发明的保护范围当视权利要求书界定的范围为准。In summary, although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person of ordinary skill in the art, without departing from the spirit and scope of the present invention, can make various modifications. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.
Claims (7)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202011096233.8A CN112130337B (en) | 2020-10-14 | 2020-10-14 | Fiber laser array piston phase and tilt phase synchronization control system and method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202011096233.8A CN112130337B (en) | 2020-10-14 | 2020-10-14 | Fiber laser array piston phase and tilt phase synchronization control system and method |
Publications (2)
Publication Number | Publication Date |
---|---|
CN112130337A CN112130337A (en) | 2020-12-25 |
CN112130337B true CN112130337B (en) | 2022-05-13 |
Family
ID=73853676
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN202011096233.8A Active CN112130337B (en) | 2020-10-14 | 2020-10-14 | Fiber laser array piston phase and tilt phase synchronization control system and method |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN112130337B (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112881797B (en) * | 2021-01-11 | 2022-08-09 | 中国科学院上海光学精密机械研究所 | Single multipath synchronous measurement method and device based on all-fiber spectral interference |
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 |
CN114006248B (en) * | 2021-11-03 | 2023-05-05 | 中国人民解放军国防科技大学 | System and method for controlling phase of large array element coherent synthesis |
CN114006247B (en) * | 2021-11-03 | 2023-05-05 | 中国人民解放军国防科技大学 | Phase control system and method based on time-frequency multi-domain information |
CN113985539B (en) * | 2021-11-04 | 2022-09-23 | 中国人民解放军国防科技大学 | Array beam tilt aberration correction system |
CN114623940B (en) * | 2022-03-09 | 2024-09-20 | 中国人民解放军国防科技大学 | All-fiber network large array element number coherent array and phase control method thereof |
US11619716B1 (en) | 2022-08-15 | 2023-04-04 | Aurora Operations, Inc. | Light detection and ranging (lidar) sensor system including seed modulation module |
CN118519270B (en) * | 2024-07-25 | 2024-09-27 | 中国人民解放军国防科技大学 | Three-dimensional spatial position control method and system of vortex spot based on coherent array |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8228599B1 (en) * | 2009-12-10 | 2012-07-24 | The Boeing Company | Coherent beam combining using real time holography |
CN104037606A (en) * | 2014-06-19 | 2014-09-10 | 中国科学院光电技术研究所 | Distributed self-adaptive optical system based on optical fiber |
CN105977780A (en) * | 2016-07-15 | 2016-09-28 | 中国科学院光电技术研究所 | Array type all-fiber self-adaptive coupling control system for space linear polarization bidirectional receiving and transmitting |
CN110729628A (en) * | 2019-10-22 | 2020-01-24 | 中国人民解放军国防科技大学 | Piston phase control system and method |
CN111725696A (en) * | 2020-06-16 | 2020-09-29 | 中国人民解放军国防科技大学 | Piston phase control system and control method of laser coherent array |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7402785B2 (en) * | 2006-01-30 | 2008-07-22 | Science Applications International Corporation | System and method for correction of turbulence effects on laser or other transmission |
US7733930B2 (en) * | 2007-04-10 | 2010-06-08 | Northrop Grumman Systems Corporation | Error control for high-power laser system employing diffractive optical element beam combiner with tilt error control |
US7924894B2 (en) * | 2008-01-18 | 2011-04-12 | Northrop Grumman Systems Corporation | Digital piston error control for high-power laser system employing diffractive optical element beam combiner |
US7756169B2 (en) * | 2008-01-23 | 2010-07-13 | Northrop Grumman Systems Corporation | Diffractive method for control of piston error in coherent phased arrays |
FR3026181B1 (en) * | 2014-09-19 | 2017-11-03 | Onera (Office Nat D'etudes Et De Rech Aerospatiales) | WAVE SURFACE ANALYZER AND METHOD FOR DETERMINING EXISTING PISTON AND TILT VARIANCES BETWEEN MULTIPLE LUMINOUS BEAMS |
-
2020
- 2020-10-14 CN CN202011096233.8A patent/CN112130337B/en active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8228599B1 (en) * | 2009-12-10 | 2012-07-24 | The Boeing Company | Coherent beam combining using real time holography |
CN104037606A (en) * | 2014-06-19 | 2014-09-10 | 中国科学院光电技术研究所 | Distributed self-adaptive optical system based on optical fiber |
CN105977780A (en) * | 2016-07-15 | 2016-09-28 | 中国科学院光电技术研究所 | Array type all-fiber self-adaptive coupling control system for space linear polarization bidirectional receiving and transmitting |
CN110729628A (en) * | 2019-10-22 | 2020-01-24 | 中国人民解放军国防科技大学 | Piston phase control system and method |
CN111725696A (en) * | 2020-06-16 | 2020-09-29 | 中国人民解放军国防科技大学 | Piston phase control system and control method of laser coherent array |
Non-Patent Citations (10)
Title |
---|
350-W Coherent Beam Combining of Fiber Amplifiers With Tilt-Tip and Phase-Locking Control;Xiong Wang;《IEEE PHOTONICS TECHNOLOGY LETTERS》;20121231;全文 * |
Adaptive Array of Phase-Locked Fiber Collimators:Analysis and Experimental Demonstration;Mikhail A. Vorontsov;《IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS》;20091231;全文 * |
Coherent combing of 60 fiber lasers using stochastic parallel gradient descent algorithm;Rongtao Su, Jiachao Xi;《OSA Laser Congress》;20191231;全文 * |
High power orbital-angular-momentum beam generation system based on coherent beam array combination technique;Dong Zhi;《Physics Review A》;20170822;全文 * |
Image mapping spectrometry:calibration and characterization;Noah Bedard;《Society of Photo- Optical Instrumentation Engineers》;20121101;全文 * |
Novel adaptive fiber-optics collimator for coherent beam combination;Dong Zhi;《OPTICS EXPRESS》;20141115;全文 * |
Phase measurement of a segmented wave front using PISton and TILt interferometry (PISTIL);MAXIME DEPREZ;《OPTICS EXPRESS》;20180305;全文 * |
Piston and tilt interferometry for segmented wavefront sensing;Maxime Deprez;《Optics Letters》;20160303;全文 * |
Wavefront sensing based on fiber coupling in;FENG LI;《OPTICS EXPRESS》;20190318;全文 * |
光纤激光目标在回路相干合成技术研究;支冬;《中国博士学位论文全文数据库 基础科学辑》;20200215;正文第3页,第86-100页,图3.32、图3.37、图3.50 * |
Also Published As
Publication number | Publication date |
---|---|
CN112130337A (en) | 2020-12-25 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN112130337B (en) | Fiber laser array piston phase and tilt phase synchronization control system and method | |
JP5368261B2 (en) | Extreme ultraviolet light source device, control method of extreme ultraviolet light source device | |
CN111725696B (en) | Piston phase regulation and control system and method of laser coherent array | |
CN108319091B (en) | Target-in-the-loop laser phased array system and control method | |
CN114859566B (en) | Multi-path laser splicing and synthesizing system based on automatic light path alignment and pointing accurate control | |
CN109802291B (en) | Optical fiber laser aperture coherent synthesis phase control method based on deep learning | |
CN106768280B (en) | A vibration detection device based on multi-wavelength lensless Fourier transform digital holography | |
CN106444056A (en) | Sparse optical synthetic aperture imaging device based on three apertures and light beam combination correction method thereof | |
CN105334028B (en) | Calibration method for improving double-beam synthesis precision and pointing precision by using single detector to synthesize far field | |
CN1804711A (en) | Device for improving beam quality of solid laser by using intracavity adaptive optical technology | |
CN104567719B (en) | A kind of high-space resolution long-range profile detection means and detection method | |
CN113937609B (en) | Active phase locking method for fiber laser coherent synthesis based on Dammann vortex grating and fiber laser coherent synthesis system | |
CN114089594B (en) | A method and device for moving a target along the optical axis of a camera | |
JP5711326B2 (en) | Extreme ultraviolet light generator | |
CN105466576B (en) | Device and method for synchronously measuring height and angle non-isohalo wavefront errors of atmospheric turbulence | |
CN103441419A (en) | Optical fiber laser all-optical feedback passive coherence beam combination system based on Dammann grating | |
CN110289907A (en) | Laser communication method and system based on two-dimensional laser phased array | |
CN116169544B (en) | A coherent synthesis system of array laser to target and control method thereof | |
CN114006248B (en) | System and method for controlling phase of large array element coherent synthesis | |
CN118010692A (en) | Single-molecule positioning microscopic imaging device based on lattice light illumination | |
CN114967131B (en) | Self-calibration multi-optical-axis imaging system with wave front shaping function and imaging method thereof | |
CN104729424B (en) | Confocal dot laser microscope and its scan method based on self-mixed interference | |
CN112033647B (en) | Multi-aperture system pupil detection and correction method | |
CN211452292U (en) | Three-dimensional angle measuring device of dynamic target | |
CN112099121A (en) | Scanning interference photoetching system based on 4f system |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PB01 | Publication | ||
PB01 | Publication | ||
SE01 | Entry into force of request for substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
GR01 | Patent grant | ||
GR01 | Patent grant |