Vornehm Joseph E, Schweinsberg Aaron, Shi Zhimin, Gauthier Daniel J, Boyd Robert W
Institute of Optics, University of Rochester, Rochester, New York 14627, USA.
Opt Express. 2013 Jun 3;21(11):13094-104. doi: 10.1364/OE.21.013094.
Phase control is crucial to the operation of coherent beam combining systems, whether for laser radar or high-power beam combining. We have recently demonstrated a design for a multi-aperture, coherently combined, synchronized- and phased-array slow light laser radar (SLIDAR) that is capable of scanning in two dimensions with dynamic group delay compensation. Here we describe in detail the optical phase locking system used in the design. The phase locking system achieves an estimated Strehl ratio of 0.8, and signals from multiple emitting apertures are phase locked simultaneously to within π/5 radians (1/10 wave) after propagation through 2.2 km of single-mode fiber per channel. Phase locking performance is maintained even as two independent slow light mechanisms are utilized simultaneously.
相位控制对于相干光束合成系统的运行至关重要，无论是用于激光雷达还是高功率光束合成。我们最近展示了一种用于多孔径、相干合成、同步相控阵慢光激光雷达（SLIDAR）的设计，该雷达能够通过动态群延迟补偿进行二维扫描。在此，我们详细描述该设计中使用的光学锁相系统。该锁相系统实现了估计的斯特列尔比为0.8，并且多个发射孔径的信号在每个通道通过2.2公里单模光纤传播后，能同时被锁相到π/5弧度（1/10波长）以内。即使同时使用两种独立的慢光机制，也能保持锁相性能。
