Abstract

A mode-locked high pulse energy fiber laser with a linear cavity by using an all-fiber structured graded index multimode fiber (GIMF) based saturable absorber (SA) is presented. The saturable absorption effect of the SA is based on the nonlinear multimode interference (NL-MMI). This is the first time the GIMF-based SA has been used in a mode-locked all-fiber laser with a linear cavity. The stable fundamental mode-locking operation can still be maintained at the maximum pump power. The output solitons have the center wavelength, spectral width, pulse duration, and repetition rate of 1571 nm, 4 nm, 675 fs, and 11.69 MHz, respectively. The maximum average output power reached is 61.4 mW, corresponding to the pulse energy up to 4.72 nJ and the pulse peak power of 7.79 kW. The proposed GIMF-based SA opens a promising way for a practical fiber-integrated mode-locker for large pulse energy fiber laser technology.

Generation of coherent multicolor noise-like pulse complex in Yb-doped fiber laser mode-locked by GIMF-SA

Shuo Chang, Hailong Wang, Zhaokun Wang, and Hailong Yang
Opt. Express 29(10) 14336-14344 (2021)

Continuously wavelength-tunable mode-locked Tm fiber laser using stretched SMF-GIMF-SMF structure as both saturable absorber and filter

Huanhuan Li, Fangming Hu, Ying Tian, Panting Wang, Junjie Zhang, and Shiqing Xu
Opt. Express 27(10) 14437-14446 (2019)

Mode-locked Tm fiber laser using SMF-SIMF-GIMF-SMF fiber structure as a saturable absorber

Huanhuan Li, Zhaokun Wang, Can Li, Junjie Zhang, and Shiqing Xu
Opt. Express 25(22) 26546-26553 (2017)

All-normal-dispersion dissipative soliton fiber laser using an offset-splicing graded-index-multimode-fiber-based saturable absorber

Wei Pan, Liang Jin, Jiazhu Wang, Renyan Wang, He Zhang, Xu Yingtian, Xin Zhao, Yang Li, and Xiaohui Ma
Appl. Opt. 60(4) 923-928 (2021)

Graded index fiber as an all-fiber saturable absorber for large energy conventional soliton and dissipative soliton generation

Zhaokun Wang, Jikai Chen, Tianyu Zhu, D. N. Wang, and Feng Gao
Photon. Res. 7(11) 1214-1220 (2019)