光纤探针探测水下激光爆炸

针对小范围内水下激光爆炸所产生的等离子体冲击波检测问题，对单模石英光纤探针探测方法进行了初步实验研究。采用1064nm调Q激光脉冲聚焦蒸馏水产生冲击波，利用自制光纤探测器进行了检测。结果发现除探测到冲击波信号外，爆炸所产生的等离子体闪光信号也进入光纤，两者混合叠加。同时由于水下激光爆炸所产生的射流对周围固壁面的破坏作用，光纤探针在实际检测过程中不能过分靠近爆炸源，对300mJ激光能量，该光纤探针安全范围应大于0．6mm。

Fiber Probe Used in Laser Detonation Underwater

Aiming at solving the detective problem of laser-induced plasma shock-wave underwater in small domain, a method of single mode quartz fiber probe has been studied on experiment preliminarily. The shock wave in distilled water is induced by a Q-switched laser with wavelength of 1064 nm, which is detected through the homemade fiber detector. From experimental figure, a mixed optical signals are found which represent arrival of shock wave and flash of plasma. As the damage effect of liquid jet to solid wall underwater, the fiber probe should not be placed too close to detonative source. There exists a safety application range which should be longer than 0.6 mm for 300 mJ pulse energy. The experimental result shows that this fiber probe can be used to investigate the shock wave underwater effectively.