Passive coherent beam combination of two nanosecond fiber amplifiers by using an all-optical feedback loop

Houkang Liu; Jun Zhou; Bing He; Qihong Lou

doi:10.1117/12.2002973

26 February 2013 Passive coherent beam combination of two nanosecond fiber amplifiers by using an all-optical feedback loop

Houkang Liu, Jun Zhou, Bing He, Qihong Lou

Author Affiliations +

Proceedings Volume 8601, Fiber Lasers X: Technology, Systems, and Applications; 860119 (2013) https://doi.org/10.1117/12.2002973
Event: SPIE LASE, 2013, San Francisco, California, United States

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.

Citation Download Citation

Houkang Liu, Jun Zhou, Bing He, and 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); https://doi.org/10.1117/12.2002973

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