基于增益负反馈的COIL自脉冲方法

针对超音速化学氧碘激光器增益介质的横流特性,设计了具有增益负反馈的光学谐振腔结构,通过化学反应的超音速流场和光场的耦合仿真,根据具体的激光器运行参数,论证了这种结构实现自脉冲激光的可行性。结果表明:振荡激光在增益区上游放大次数越多,对上游增益介质能量提取能力越强,脉冲调制作用越显著。采用激光光斑缩束再放大的结构设计,脉冲激光的峰值功率提高10~20倍,从理论上证明了增益负反馈的调制方法能够实现横流激光器脉冲激光输出。

COIL self-pulsing method based on gain negative feedback

Based on the transverse flow characteristic of supersonic chemical oxygen iodine laser gain medium, the optical resonator with gain negative feedback structure has been designed. Through coupling simulation of the chemical reaction supersonic flow field and light field, and depending on the laser operation parameters, the feasibility of this structure to realize the pulse laser has been demonstrated. The results show that when the oscillation laser in the gain area upstream is amplified the more times and energy extraction ability for the upstream gain medium is stronger, the pulse modulation effect is more significant. Using structural design that the laser spot is narrowed and then expanded, the peak power of the pulse laser will increase 10 to 20 times, which theoretically proves the modulation method of the gain negative feedback can realize the transverse flow laser with the pulse laser output.