光学学报, 2008, 28 (s1): 84, 网络出版: 2008-08-16  

频率漂移对耦合激光器阵列锁相状态的影响

Influence of Frequency Drift on Phase-Locked State of Coupled-Laser Arrays
作者单位
国防科技大学光电科学与工程学院, 湖南 长沙 410073
摘要
耦合激光器阵列可以通过激光器之间的倏逝波耦合实现相位锁定,是有望实现光束相干合成的方案之一。为了探究该阵列锁相状态的稳定性,分析了频率漂移对两路激光器阵列相位锁定状态的影响。通过对耦合激光器阵列动力学方程的数值研究发现,频率漂移将破坏激光器阵列的锁相状态,并引入相位噪声,导致输出远场光强分布不稳定; 研究还发现:倏逝波耦合能够对频率漂移的影响起到一定的抑制作用,但这种抑制只在频率漂移较弱时才有效,因此,如果将该阵列用于光束合成,加入相应的抗干扰措施还是很必要的。数值分析的结果还表明:频率漂移的低频成分对于阵列相位锁定状态的影响更为剧烈,因此,抗干扰措施应主要针对低频干扰来进行。
Abstract
Coupled laser array, which realizes phase locking of elementary lasers with evanescent waves coupling, is a promising scheme to realize coherent beam combination. To reveal the stability of the phase-locked state in the array, the influence of the frequency drift on the phase dynamics of the two-coupled-laser array is researched. It is demonstrated that the frequency drift will break up the phase-locked state of the laser array and induce the spatial instability of the far-field intensity due to phase noise. It is also found that although the evanescent coupling between elementary lasers can restrain these effects to some extent, the restrainability is too limited to be effective when the frequency drift is relatively strong. It is suggested that some anti-jamming protections should be applied to the array, especially in the atrocious environment. Furthermore, the phase-locked state of the array is more sensitive to the low-frequency component of the frequency drift. Therefore, the protections should pay more attention to the low-frequency jamming.

曹涧秋, 陆启生, 许晓军, 侯静. 频率漂移对耦合激光器阵列锁相状态的影响[J]. 光学学报, 2008, 28(s1): 84. Cao Jianqiu, Lu Qisheng, Xu Xiaojun, Hou Jing. Influence of Frequency Drift on Phase-Locked State of Coupled-Laser Arrays[J]. Acta Optica Sinica, 2008, 28(s1): 84.

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