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.

An optical interrupter for high-power transfer is developed for application in laser ignition or initiation systems, to prevent unintended detonation of a laser detonator while ensuring that detonation will reliably take place when needed. The optical switch acting as a high-power optical energy interrupter is investigated through simulations and experiment. The prototype of this novel optical interrupter, which has been designed and fabricated, employs microelectromechanical system V-grooves for precise positioning of optical fibers, a miniature cam for the actuator, and a stepper motor for the drive source. The cam's rotary movement displaces the input fiber so that it is aligned with the output fiber. The main performance parameters have been achieved. The insertion loss is found to be 0.4 dB (without antireflection coatings) with a maximum power handling capacity of 2 MW. Switching time is approximately 50 ms with channel isolation between the on and off states of 20 dB. (C) 2010 Optical Society of America