In order to reveal the influence of laser beam profiles on the performance of laser‐driven flyers, three different laser beam profiles including original laser beam, reshaped laser beam and optical fiber output laser beam were used to launch the flyer plates. The original laser beam showed plenty of “hot spots”. A lenslet array was used to reshape the original laser beam and a much smoother intensity distribution was obtained. Both original and reshaped laser beams were coupled to optical fibers. Results showed that the laser energy that a fiber can reliably transmit increased 29 % and reached up to 59 mJ by reshaping the original laser beam. Furthermore, PDV measurements indicated that there was a 68 % increase in flyer velocity when the flyer was driven by a fiber coupled laser instead of the original laser, and the flyer velocity could reach up to 1.5 km/s when irradiated by a 50 mJ laser. Aside from the velocity increase, the fiber coupled laser was proven to be capable of producing controllable planar and intact flyer. A fiber coupled laser initiation system incorporating a laser slapper detonator was developed. The fine grain CL‐20 was successfully initiated using the fiber coupled laser initiation system under 40 mJ laser energy, implicating the fiber coupled system is applicable in high energy explosive initiations.

中文翻译：

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激光束轮廓对激光驱动飞行器性能的影响

为了揭示激光束轮廓对激光驱动飞行器性能的影响，使用了三种不同的激光束轮廓（包括原始激光束，整形激光束和光纤输出激光束）发射了飞行器板。原始激光束显示出很多“热点”。使用小透镜阵列对原始激光束进行整形，并获得了更加平滑的强度分布。原始和整形的激光束都耦合到光纤。结果表明，通过重新塑形原始激光束，光纤可以可靠传输的激光能量增加了29％，达到了59 mJ。此外，PDV测量结果表明，当飞行器由光纤耦合激光器而不是原始激光器驱动时，飞行器速度增加了68％，当受到50 mJ激光照射时，飞行器速度可能达到1.5 km / s。除了提高速度外，光纤耦合激光器还被证明能够产生可控的平面和完整的飞行物。开发了结合有激光拍板雷管的光纤耦合激光起爆系统。使用40 mJ激光能量的纤维耦合激光引发系统成功引发了细粒CL-20，这意味着该纤维耦合系统适用于高能爆炸起爆。