Open Access37 kW monolithic narrow linewidth single mode fiber laser through simultaneously suppressing nonlinear effects and mode instability
Author(s) -
Hungyen Lin,
Rumao Tao,
C. Li,
B. Wang,
Chunyu Guo,
Qiang Sheng,
Pengfei Zhao,
Lixin Xu,
Jun Wang,
Jing Feng,
Qiuhui Chu
Publication year - 2019
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.27.009716
Subject(s) - laser linewidth , materials science , optics , fiber laser , brillouin scattering , amplified spontaneous emission , laser , fiber , single mode optical fiber , raman scattering , laser beam quality , optoelectronics , raman spectroscopy , physics , laser beams , composite material
In this paper, we report a 3.7 kW all fiber narrow linewidth single mode fiber laser. The full width at half-maximum is about 0.30 nm, and the beam quality is Mx2=1.358, My2=1.202 at maximum output power. The laser is achieved by simultaneously suppressing nonlinear effects and mode instability (MI). Different seeds are injected into the main amplifier to study stimulated Raman scattering (SRS) effect. The results show that the phase modulated single frequency seed is benefit to suppress the SRS effect. For the phase modulated single frequency seed, inserting a filter in preamplifier will suppress amplified spontaneous emission (ASE) and decrease the backward power. By optimizing the coiling of active fiber, the MI effect is suppressed.