Over 400 W graded-index fiber Raman laser with brightness enhancement

The power scaling on all-fiberized Raman fiber oscillator with brightness enhancement (BE) based on multimode graded-index (GRIN) fiber is demonstrated. Thanks to beam cleanup of GRIN fiber itself and single-mode selection properties of the fiber Bragg gratings inscribed in the center of GRIN fiber,...

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Bibliographic Details
Published in:Optics express 2021-06, Vol.29 (13), p.19441-19449
Main Authors: Fan, Chenchen, Chen, Yizhu, Yao, Tianfu, Xiao, Hu, Xu, Jiangming, Leng, Jinyong, Zhou, Pu, Wolf, Alexey A., Nemov, Ilya N., Kuznetsov, Alexey G., Kablukov, Sergey I., Babin, Sergey A.
Format: Article
Language:English
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Summary:The power scaling on all-fiberized Raman fiber oscillator with brightness enhancement (BE) based on multimode graded-index (GRIN) fiber is demonstrated. Thanks to beam cleanup of GRIN fiber itself and single-mode selection properties of the fiber Bragg gratings inscribed in the center of GRIN fiber, the efficient BE is realized. For the laser cavity with single OC FBG, continuous-wave power of 334 W with an M 2 value of 2.8 and BE value of 5.6 were obtained at a wavelength of 1120 nm with an optical-to-optical efficiency of 49.6%. Furthermore, the cavity reflectivity is increased by employing two OC FBGs to scale the output power up to 443 W, while the corresponding M 2 is 3.5 with BE of 4.2. To our best knowledge, it is the highest power in Raman oscillator based on GRIN fiber.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.427605