Open AccessGeneration of mode-locked square-shaped and chair-like pulse based on reverse saturable absorption effect of nonlinear multimode interference
Author(s) -
Zhipeng Dong,
Jin Lin,
Hongxun Li,
Shujie Li,
Runxia Tao,
Changzhi Gu,
Peijun Yao,
Lixin Xu
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.27.027610
Subject(s) - saturable absorption , optics , multi mode optical fiber , materials science , fiber laser , laser , polarization controller , mode locking , optoelectronics , optical fiber , physics
In this paper, the phenomenon of reverse saturable absorption of offset-spliced graded index multimode fibers (OS-GIMF) is revealed. And based on that, the stable square-shaped and chair-like mode-locked pulses are demonstrated with the maximum pulse energy of 0.14 µJ and 23.8 nJ respectively, while the OS-GIMF acts as a saturable absorber (SA) in fiber laser. By adjusting polarization controller (PC) and the pump power, square-shaped and chair-like pulse can be switched to each other. This multimode SA could sever as high power light source owing to its high damage threshold, compact structure and low cost.