Single-frequency fiber laser from linear cavity with loop mirror filter and dual-cascaded FBGs

Author

Huang, Shenghong ; Qin, Guanshi ; Feng, Yan ; Shirakawa, Akira ; Musha, Mitsuru ; Ueda, Ken-ichi

Author_Institution

Inst. for Laser Sci., Univ. of Electro-Commun., Tokyo, Japan

Volume

17

Issue

6

fYear

2005

fDate

6/1/2005 12:00:00 AM

Firstpage

1169

Lastpage

1171

Abstract

A single-frequency ytterbium fiber laser was demonstrated by introducing a loop mirror filter, a polarization controller (PC), and dual-cascaded fiber Bragg gratings (FBGs) in linear laser cavity. The loop mirror with unpumped ytterbium fiber as a narrow bandwidth filter discriminated and selected laser longitudinal modes efficiently. The spatial hole burning effect was restrained by adjusting PC appropriately. Dual closely cascaded FBGs as the output coupler, acting as an etalon, expanded the operation range of single frequency. Output power up to 18 mW at 1064 nm were obtained under the launched pump power of 107 mW at 976 nm, the optical-optical conversion efficiency was about 16.8%; the slope efficiency was about 20%.

Keywords

Bragg gratings; fibre lasers; laser cavity resonators; laser mirrors; laser modes; light interferometers; optical fibre couplers; optical fibre filters; optical fibre polarisation; optical hole burning; optical pumping; optical variables control; ytterbium; 1064 nm; 107 mW; 18 mW; 976 nm; dual-cascaded FBG; etalon; fiber Bragg gratings; fiber laser; laser longitudinal modes; linear cavity; linear laser cavity; loop mirror filter; narrow bandwidth filter; optical-optical conversion efficiency; output coupler; polarization controller; single-frequency laser; slope efficiency; spatial hole burning effect; unpumped ytterbium fiber; ytterbium fiber laser; Bragg gratings; Fiber gratings; Fiber lasers; Laser modes; Mirrors; Nonlinear filters; Optical control; Optical fiber polarization; Quantum cascade lasers; Ytterbium; Dynamic Bragg grating; loop mirror filter (LMF); single-frequency laser; spatial hole burning;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2005.846469

Filename

1432765