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仿真和实验研究了一种控制Nd:YAG脉冲激光能量通断的光纤直接连接型光开关。建立光纤耦合模型,分析了光纤对准误差中对耦合效率的影响,其中横向偏移的影响最显著。采用微机电系统V型槽固定光纤,微小型凸轮作为制动器,步进电机驱动凸轮旋转,微小型凸轮与移动光纤相切,带动光纤移动,实现两光纤的错开和对准。制造了这种高功率直接连接型光纤光开关原理样机,并进行了主要性能测试。测试结果表明,这种光开关能够满足激光点火系统的大容量、高隔离度的要求。
Simulation and experimental study of a controlled Nd: YAG pulsed laser energy on-off optical fiber directly connected optical switch. The fiber coupling model is established, and the influence of the fiber alignment error on the coupling efficiency is analyzed. The transverse offset has the most significant effect. Micro-electromechanical V-groove fixed optical fiber, micro-cam as a brake, stepper motor driven cam rotation, micro-cam and moving the optical fiber tangent, drive the optical fiber to achieve the two fibers staggered and aligned. The prototype of this kind of high-power direct-connect optical fiber optical switch was manufactured and the main performance test was carried out. The test results show that this optical switch can meet the requirements of large capacity and high isolation of the laser ignition system.