倾斜可控阵列光场的二维扫描技术研究  

Two-Dimensional Scanning Technique Based on Light Field in Tilting Phase-Controlled Arrays

作　　者：殳博王 张雨秋 常洪祥 常琦 马鹏飞 冷进勇 周朴[1] Shu Bowang;Zhang Yuqiu;Chang Hongxiang;Chang Qi;Ma Pengfei;Leng Jinyong;Zhou Pu(College of Advanced Interdisciplinary Studies,National University of Defense Technology,Changsha 410073,Hunan,China;Nanhu Laser Laboratory,National University of Defense Technology,Changsha 410073,Hunan,China;Hunan Provincial Key Laboratory of High Energy Laser Technology,National University of Defense Technology,Changsha 410073,Hunan,China)

机构地区：[1]国防科技大学前沿交叉学科学院,湖南长沙410073 [2]国防科技大学南湖之光实验室,湖南长沙410073 [3]国防科技大学高能激光技术湖南省重点实验室,湖南长沙410073

出　　处：《中国激光》2024年第2期84-96,共13页Chinese Journal of Lasers

基　　金：国家重点研发计划(2022YFB3606000)。

摘　　要：以19路、127路和919路激光相干阵列为模型,通过倾斜波前调控技术对阵列光场的子阵元施加倾斜相位控制,对倾斜可控阵列光场的大角度二维扫描特性进行了理论和实验研究。结果表明,所提出的方法可实现大视场范围内任意位置的单点扫描,同时得到能量分布均匀的二维连续扫描路径,实现特殊光场图案定制。此外,该方法具有扫描范围不受限制、扫描模式准连续以及衍射效率高等特点,在提升输出功率和扫描精度等方面具有优势。Objective Laser scanning technologies are applied into numerous fields,such as free space optical communication,LIDAR,laser processing,and remote imaging.Therefore,it is important in military equipment and industrial manufacturing.Currently,most laser scanning technologies are realized by silicon-based photo-electronics,liquid crystal spatial light modulator,micro electro mechanical system(MEMS),and coherent laser arrays,etc.Among them,coherent laser arrays are proved to be an efficient method for generating laser with high power,brightness,and beam quality.Owing to designable coherent laser arrays and flexible phase controlling algorithm,remarkable progress in scanning technologies has been realized.In 2022,Zhou et al.utilized constant piston phase differences between-πandπto control the positions of far-field light spots,with limited maximum scanning angle and relatively low diffraction efficiency.In 2021,construction of quasi-continuous scanning system with the combination of micro-lens arrays and adaptive fiber optics collimators(AFOCs)was proposed.Such a system realizes controllable tilting-phase mainly by AFOCs.However,only experimental results of one-dimensional quasi-continuous scanning patterns are provided.Thus,it is urgent to study more possibilities in the customization of any light field patterns and determine the detailed scanning characteristics under the condition of huge coherent laser array to satisfy additional application requirements.Methods The method of two-dimensional continuous scanning is mainly based on the regular hexagonal arrangement of coherent laser arrays.Then,the phase modulation mode is set as the sawtooth titling phase corresponding to maximum optical path differences,which belongs to a type of blazed grating phase-controlling mode.When the maximum optical path differences of adjacent subapertures increase,their phase differences increase,i.e.,the tilting phase in single sub-aperture can sustain periodic change compared to constant piston phase.Therefore,the beam will deflect

关 键 词：激光光学 激光阵列 相干合成 倾斜调控 二维扫描 光场定制 

分 类 号：TN249[电子电信—物理电子学]