光纤非相干合成光束在湍流大气中的传输实验研究

进行了六路100 W量级光纤非相干合成光束在实际大气湍流中的传输实验,将六路光斑直径为9 mm的单模光纤光束分别扩束，扩束后的光斑直径为90 mm。基于倾斜镜的合束系统来控制各路光束的指向，在不同强度的湍流条件中，通过主镜口径为440 mm的发射系统水平聚焦传输至470 m处。倾斜控制系统闭环工作时，一倍衍射极限内的桶中功率占目标处总功率的比值是开环工作时的1.7倍左右，随着大气湍流的强度变弱，此比值变大。

Experimental research on propagation of incoherent combined beams of fiber lasers in atmospheric turbulence

The paper presents experimental results of the propagation performance of incoherent combined beams of six 100-watt single-mode fiber lasers. The waist size of each laser beam increases from 9 mm to 90 mm when it propagates through the beam expander. The six optical axes of fiber lasers in an array are controlled using individually controlled tip-tilt mirrors. The laser array is propagated to the target at a range of 470 m by a 440-mm beam director in strong and weak atmospheric turbulence. With the decrease in the intensity of turbulence, the ratio of the power in bucket to the total power on the target increases. And the increase ratio due to tip-tilt correction is about 1.7.