Zong Zhaoyu, Tian Xiaocheng, Fan Mengqiu, Zhou Dandan, Zhang Rui, Zhao Junpu, Zheng Wanguo, Xu Dangpeng
Laser Fusion Research Center, China Academy of Engineering Physics, Mianyang 621900, China.
Micromachines (Basel). 2023 Oct 14;14(10):1927. doi: 10.3390/mi14101927.
Phase-modulated (PM) spectral failsafe systems are necessary to promptly terminate amplification processes following accidental seeding of a high-power laser chain with a non-PM pulse to prevent optical damage. In this work, we present a reliable spectral failsafe system that can indicate the presence or absence of sufficient PM light. This requirement is met by combining dual temperature-sensitive fiber Bragg gratings detection with high-speed RF amplitude comparisons. The failsafe trigger signal is generated when the spectral power at the peak sideband exceeds that at the center. The spectral failsafe system has the ability to distinguish between adequate and inadequate PM pulses, and it exhibits significant robustness in pulse width, TEC temperature drift, and DFB wavelength drift in experiments, making it valuable for safe high-power laser operations and providing a useful reference for other detection system designs.
相位调制（PM）光谱故障安全系统对于在高功率激光链意外被非PM脉冲种子注入后迅速终止放大过程以防止光学损伤是必要的。在这项工作中，我们展示了一种可靠的光谱故障安全系统，它可以指示是否存在足够的PM光。通过将双温度敏感光纤布拉格光栅检测与高速射频幅度比较相结合来满足这一要求。当峰值边带处的光谱功率超过中心处的光谱功率时，产生故障安全触发信号。该光谱故障安全系统有能力区分足够和不足的PM脉冲，并且在实验中在脉冲宽度、TEC温度漂移和DFB波长漂移方面表现出显著的稳健性，这使其对于高功率激光的安全运行很有价值，并为其他检测系统设计提供了有用的参考。
