阵列合成激光束在湍流大气中传输的研究进展

Research Progress on Propagation of Laser Array Beams in Turbulent Atmosphere

多路激光束合成是获得高功率和高能量激光输出的有效途径,因此,多年来光束合成方法和技术得到了广泛的关注和深入研究。近年来,随着空间光通信和激光传播工程等应用需求的发展,合成光束在湍流大气中的传播过程及其规律研究也逐渐成为光传播研究领域的热点问题。针对多种典型激光阵列合成光束,首先对比分析了广义Huygens-Fresnel原理、Rytov微扰近似以及随机相位屏数值模拟等方法在激光阵列合成光束大气传输研究中的应用;其次,阐述了合成光束传播应用研究中的桶中功率、衍射极限倍数β、M^2因子、光束传输因子等光束质量评价因子的评价作用;最后,根据阵列合成激光束的研究现状和成果,提出了应进一步深入研究的问题。

Combination of multiple laser beams provides an effective approach for achieving high power laser beam with high energy, so beam combination technologies have been widely investigated for the past years Recently, with the development of practical application requirement such as free-space optical communica- tion and laser propagation engineering, the propagation properties of combined beams through atmospheric turbulence gradually become hot issues in the field of light propagation. Firstly, the comparison of various techniques including extended Huygens-~resnel principle, Rytov perturbation approximation and numerical simulation is conducted, according to various combined beams that are composed by multiple typical laser arrays. Secondly, some methods for estimating the beam quality of combined beams are listed, such as power in the bucket （PIB）,/~ factor, M2 factor and beam propagation factor （BPF）. Finally, some problems that should be further studied according to investigation actualities and main results of combined beams are presented.