Passive Phase Locking of Three Nanosecond Fiber Amplifiers Using a Dammann Grating Spatial Filter
YANG Yi-Feng1,2, ZHENG Ye1,2, HE Bing1**, ZHOU Jun1**, LIU Hou-Kang1,2, HU Man1,2, WEI Yun-Rong1, LOU Qi-Hong1
1Shanghai Key Laboratory of All Solid-State Laser and Applied Techniques, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800 2University of Chinese Academy of Sciences, Beijing 100049
Abstract：A passive coherent beam combination of three nanosecond Yb-doped fiber amplifiers by an all-optical feedback loop is realized by a Dammann grating intracavity spatial filter. By using this diffractive-optics-based spatial filtering technique, three tile-aperture laser beams are phase-locked with a peak power of 1.02 kW. The width of the combined pulses is 9.6 ns, and the repetition frequency is 2.208 MHz. The visibility of the far-field interference pattern is up to 82.9%. The results show that this approach can scale to larger arrays and higher powers.
. [J]. 中国物理快报, 2014, 31(08): 84206-084206.
YANG Yi-Feng, ZHENG Ye, HE Bing, ZHOU Jun, LIU Hou-Kang, HU Man, WEI Yun-Rong, LOU Qi-Hong. Passive Phase Locking of Three Nanosecond Fiber Amplifiers Using a Dammann Grating Spatial Filter. Chin. Phys. Lett., 2014, 31(08): 84206-084206.
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2014, Vol. 31 
