Stretched graded-index multimode optical fiber as a saturable absorber for erbium-doped fiber laser mode locking

被引：110

作者：

Wang, Zhaokun ^{[1
]}

Wang, D. N. ^{[1
]}

Yang, Fan ^{[1
]}

Li, Liujiang ^{[1
]}

Zhao, Chun-Liu ^{[1
]}

Xu, Ben ^{[1
]}

Jin, Shangzhong ^{[1
]}

Cao, Shi-Ying ^{[2
]}

Fang, Zhan-Jun ^{[2
]}

机构：

[1] China Jiliang Univ, Coll Opt & Elect Technol, Hangzhou 310018, Zhejiang, Peoples R China

[2] Natl Inst Metrol, Div Time & Frequency Metrol, Beijing 100013, Peoples R China

来源：

OPTICS LETTERS | 2018年 / 43卷 / 09期

基金：

国家重点研发计划;

关键词：

2ND-HARMONIC GENERATION; NONLINEAR PROPAGATION; MULTICORE; ABSORPTION; INTERFERENCE; DYNAMICS;

D O I：

10.1364/OL.43.002078

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

A novel mode-locking method based on the nonlinear multimode interference in the stretched graded-index multimode optical fiber (GIMF) is proposed in this Letter. The simple device geometry, where the light is coupled in and out of the stretched GIMF via single-mode fibers, is demonstrated to exhibit the temporal intensity discrimination required for mode locking. The nonlinear saturable absorber (SA) characteristics of the device are controllable by simply adjusting the strength of the stretching applied. The modulation depth of the device, which consists of similar to 23.5 cm GIMF, is tuned from 10.37% to 22.27%. Such a simple SA enables the wavelength-switchable mode-locking operation in a ring Er-doped fiber laser, and ultrafast pulses with a pulse width of 506 fs at 1572.5 nm and 416 fs at 1591.4 nm were generated. The versatility and simplicity of the SA device, together with the possibility of scaling the pulse energy, make it highly attractive in ultrafast photonics. (C) 2018 Optical Society of America

引用

页码：2078 / 2081

页数：4

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