Experimental analyses on passive coherent combining of  all-fiber feedback ring cavity based on diffractive optical element

Xiaxia Niu; Meizhong Liu; Yifeng Yang; Bing He; Jun Zhou

doi:10.1117/12.2573718

10 October 2020 Experimental analyses on passive coherent combining of all-fiber feedback ring cavity based on diffractive optical element

Xiaxia Niu, Meizhong Liu, Yifeng Yang, Bing He, Jun Zhou

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Proceedings Volume 11544, High-Power Lasers and Applications XI; 115440E (2020) https://doi.org/10.1117/12.2573718
Event: SPIE/COS Photonics Asia, 2020, Online Only

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Abstract

Diffractive optical element is used to realize single-aperture output for passive coherent combining of 8-channel fiber laser. Using this system, we demonstrated the far-field coherent visibility, output spectrum and beam quality after coherent combining. Experimental results show that phase noise will cause the mode frequency to change under multi-channel conditions. However, the beam quality and the coherent visibility after coherent combination do not change significantly. The far-field coherence visibility reached 98.6%, the beam quality M²=1.21, and the diffraction limit magnification factor β reached 1.98. This shows that in the presence of low phase noise, even if the number of channels is increased, a coherent combined output with high beam quality can be obtained.

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Xiaxia Niu, Meizhong Liu, Yifeng Yang, Bing He, and Jun Zhou "Experimental analyses on passive coherent combining of all-fiber feedback ring cavity based on diffractive optical element", Proc. SPIE 11544, High-Power Lasers and Applications XI, 115440E (10 October 2020); https://doi.org/10.1117/12.2573718

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