光纤激光相干合成中倾斜波前控制的研究进展

Recent Research and Development of Tilt-Tip Wavefront Control in Coherent Beam Combination of Fiber Lasers

相干合成是获得高功率、高光束质量激光输出的有效方法之一。在光纤激光相干合成中，各路激光的活塞相差、倾斜波前和光束拼接方式直接影响合成光束的质量。各个单元光束波前的倾斜误差对合成的效果有重要影响，因而倾斜波前控制具有重要的意义。详细介绍了液晶空间光调制器、高速倾斜镜和光纤自适应准直器等常用的倾斜控制器件，对比目前用于倾斜波前控制的不同方案，分析了各方案的优缺点。并对光纤激光相干合成中倾斜波前主动控制的发展进行了总结和展望。

Coherent beam combination is an effective way to achieve high-power laser while maintain good beam quality. In coherent beam combination, the piston phase differences, tilt-tip wavefronts and filling factor of each beamlets have direct effects on the combined beam quality. The tilt-tip error of each beamlet have significant influence on coherent combination, so the tilt-tip control is of great significance. The main tilt-tip control instruments, including liquid crystal spatial light modulator, fast steering mirror and adaptive fiber collimator, are introduced detailedly. Advantages and disadvantages of different tilt-tip wavefront active control methods are analyzed. The development and perspective of tilt-tip wavefront control in coherent beam combination are reviewed