Dammann-grating-based passive phase locking by an all-optical feedback loop

A Dammann grating is used as a spatial filter for a passive coherent beam combination (CBC) of three Yb-doped fiber amplifiers with an all-optical feedback loop. Using this diffractive-optics-based spatial filtering technique, we demonstrate CBC with 20 W output power, and the visibility of the far-...

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Bibliographic Details
Published in:Optics letters 2014-02, Vol.39 (3), p.708-710
Main Authors: Yang, Yifeng, Liu, Houkang, Zheng, Ye, Hu, Man, Liu, Chi, Qi, Yunfeng, He, Bing, Zhou, Jun, Wei, Yunrong, Lou, Qihong
Format: Article
Language:English
Subjects:
Amplifiers
Arrays
Beams (radiation)
Coherence
Diffraction gratings
Diffraction patterns
Feedback loops
Gratings (spectra)
Spatial filtering
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Summary:A Dammann grating is used as a spatial filter for a passive coherent beam combination (CBC) of three Yb-doped fiber amplifiers with an all-optical feedback loop. Using this diffractive-optics-based spatial filtering technique, we demonstrate CBC with 20 W output power, and the visibility of the far-field interference pattern is up to 88.7%. Measurements suggest that this approach is robust with respect to laboratory environment perturbations, and it can scale to high powers and large arrays.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.39.000708