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构建了一种基于光纤传输高功率激光的飞片发射系统,并测试了飞片速度.飞片膜层为三明治结构:铝烧蚀层、氧化铝隔离层和铝飞片产生层.飞片膜层采用磁控溅射技术沉积在玻璃衬底上,总厚度为5.5μm.激光辐照铝膜层产生高温高压等离子体,驱动剩余膜层产生高速飞片,速度达数km/s.同时,实验研究了光纤传能系统的输出激光空间分布特性和传输激光能量容量,它们决定了飞片的平面性和最大速度.光纤端面损伤是限制光纤传输激光能量容量的关键因素,光纤端面通过精密机械抛光和激光预处理可以获得理想的抗激光损伤能力.采用基于光纤阵列探针的时间序列测试技术获得了飞片的平均速度,并评估了飞片的平面性.采用搭建的基于光纤传输高功率激光的飞片发射系统获得了速度达1.7km/s、直径接近1mm的高速飞片.
A fly-off system based on optical fiber transmission of high-power laser was constructed and the flying-film speed was tested.The flying-film layer was sandwich structure: aluminum ablation layer, aluminum oxide isolation layer and aluminum fly- Layer deposited by magnetron sputtering on a glass substrate with a total thickness of 5.5μm, high temperature and high pressure plasma generated by the laser irradiation of the aluminum film layer to drive the remaining film layer to produce high-speed flying film at a speed of several km / s, Experimental study of the output laser spatial distribution characteristics and transmission laser energy capacity of the optical fiber transmission system determines the flatness and maximum speed of the flyer.The damage of the optical fiber end facet is a key factor that limits the energy capacity of the optical fiber transmitting laser and the end face of the optical fiber passes the precision machinery Polishing and laser pretreatment can get ideal anti-laser damage ability.The average speed of fly-blade was obtained by time-series testing technology based on fiber array probe, and the flatness of fly-blade was evaluated.Using fiber-optic high power transmission The laser fly-by-wire system achieved high-speed flyer speeds up to 1.7km / s and diameter approaching 1mm.