26 February 2013 Passive coherent beam combination of two nanosecond fiber amplifiers by using an all-optical feedback loop
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Abstract
We demonstrate a passive coherent beam combination of two nanosecond amplifiers by using an all-optical feedback loop. An electro-optic amplitude modulator is utilized to tune the pulse width and the pulse repetition frequency of combined laser pulse. The positive correlation between the visibility of far-field coherent patterns and the pulse duty ratio is found. The range of tunable pulse repetition frequency is from 2.023 MHz to 6.069 MHz, and the range of tunable pulse width is from 10 ns to 50 ns. The maximum visibility is up to 85%. This approach presented here provides a promising way for power scaling of high power nanosecond fiber laser and maintaining beam quality simultaneously.
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Houkang Liu, Houkang Liu, Jun Zhou, Jun Zhou, Bing He, Bing He, Qihong Lou, Qihong Lou, } "Passive coherent beam combination of two nanosecond fiber amplifiers by using an all-optical feedback loop", Proc. SPIE 8601, Fiber Lasers X: Technology, Systems, and Applications, 860119 (26 February 2013); doi: 10.1117/12.2002973; https://doi.org/10.1117/12.2002973
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