Open AccessOver 400 W graded-index fiber Raman laser with brightness enhancement
Author(s) -
Chenchen Fan,
Yizhu Chen,
Tianfu Yao,
Xiao Hu,
Jiangming Xu,
Jinyong Leng,
Pu Zhang,
Alexey A. Wolf,
Ilya N. Nemov,
А. П. Кузнецов,
S. I. Kablukov,
Sergey A. Babin
Publication year - 2021
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.427605
Subject(s) - optics , materials science , fiber laser , fiber bragg grating , graded index fiber , dispersion shifted fiber , multi mode optical fiber , photonic crystal fiber , optical fiber , laser , plastic optical fiber , double clad fiber , fiber , polarization maintaining optical fiber , raman spectroscopy , single mode optical fiber , optoelectronics , fiber optic sensor , physics , composite material
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.