基于阵列透镜和光纤集束的调频脉冲波形测试技术  

Frequency-Modulated Pulse Waveform Measurement Based on Lens Array and Fiber Bundle

作　　者：张波[1] 彭志涛[1] 孙志红[1] 夏彦文[1] 卢宗贵[1] 董军[1] Zhang Bo;Peng Zhitao;Sun Zhihong;Xia Yanwen;Lu Zonggui;Dong Jun(Research Center of Laser Fusion,China Academy of Engineering Physics,Mianyang,Sichuan 621900,China)

机构地区：[1]中国工程物理研究院激光聚变研究中心,四川绵阳621900

出　　处：《中国激光》2020年第3期34-40,共7页Chinese Journal of Lasers

基　　金：国家自然科学基金(61605185);中国工程物理研究院激光聚变研究中心青年人才成长基金(RCFCZ-2017-12)。

摘　　要：提出了一种基于阵列透镜和渐变多模光纤集束的调频脉冲测试方法,该方法通过渐变折射率多模光纤提供较大的接收孔径,通过子孔径拼接方式取样降低取样光斑在光纤端面的漂移,两者相结合可实现光束近场能量到光纤集束的高效稳定耦合。该方法中的渐变多模光纤集束可携带更多的取样光能量,有利于脉冲的高对比度测量。实验结果表明,本技术方案能够实现调频脉冲光束整体时间特性的保真测量,测量对比度可达630:1。This study proposes a method based on lens array and fiber bundle for measuring frequency-modulated pulse waveforms. Grade-index fiber can provide a large receiver aperture that allows optimum laser energy transmission and performing measurements a wide dynamical range. Lens array can decrease the drift of laser spot on the fiber end face. Combining these two benefits, the system will have a high transmission efficiency from the laser near field to the fiber bundle. Results indicate that the proposed method can perform high-accuracy measurements of frequency-modulated pulse waveforms, with the measurement contrast ratio reaching 630:1.

关 键 词：激光光学 波形测量 阵列透镜 光纤集束 耦合效率 对比度 

分 类 号：TN247[电子电信—物理电子学]