高功率低空间相干随机光纤激光器。

High-power low spatial coherence random fiber laser.

作者信息

Ma Rui, Li Jia Qi, Guo Jia Yu, Wu Han, Zhang Hua Hui, Hu Bo, Rao Yun Jiang, Zhang Wei Li

出版信息

Opt Express. 2019 Mar 18;27(6):8738-8744. doi: 10.1364/OE.27.008738.

DOI:10.1364/OE.27.008738

Abstract

A high-power multi-transverse modes random fiber laser (RFL) is investigated by combining a master oscillator power-amplifier (MOPA) configuration with a segment of extra-large mode area step-index multimode fiber (MMF). Spatial coherence of the high-power multi-transverse modes RFL has been analyzed, which shows that speckle contrast is reduced dramatically with the output power increasing. In this way, considerably low speckle contrast of ~0.01 is achieved under high laser power of ~56 W, which are the records for multi-transverse modes RFLs in both spatial coherence and output power. This work paves a way to develop high-power RFLs with very low spatial coherence for wide-range speckle-free imaging and free-space communication applications.

摘要

通过将主振荡功率放大器（MOPA）配置与一段超大模面积阶跃折射率多模光纤（MMF）相结合，对一种高功率多横向模式随机光纤激光器（RFL）进行了研究。分析了高功率多横向模式RFL的空间相干性，结果表明，随着输出功率的增加，散斑对比度显著降低。通过这种方式，在约56W的高激光功率下实现了相当低的散斑对比度，约为0.01，这在空间相干性和输出功率方面均创下了多横向模式RFL的记录。这项工作为开发具有极低空间相干性的高功率RFL铺平了道路，可用于大范围无散斑成像和自由空间通信应用。