High-Power 1120-nm Yb-Doped Fiber Laser and Amplifier

Author

Hanwei Zhang ; Hu Xiao ; Pu Zhou ; Xiaolin Wang ; Xiaojun Xu

Author_Institution

Coll. of Optoelectron. Sci. & Eng., Nat. Univ. of Defense Technol., Changsha, China

Volume

25

Issue

21

fYear

2013

fDate

Nov.1, 2013

Firstpage

2093

Lastpage

2096

Abstract

An all-fiberized, laser-diode-pumped, high-power, 1120-nm Yb-doped fiber laser with master oscillator power amplifier configuration was demonstrated. The seed was a 178-W single-mode fiber laser with an optical efficiency of nearly 70%. An amplifier stage was built to boost the power to 309 W with the slope efficiency of 80%. The M² factors, measured in the end of the amplifier at output power of 253 W, are 2.45 and 2.82 in x- and y-directions, respectively. A numerical model was also proposed to evaluate the ability of seed power level in suppressing amplified spontaneous emission in the fiber amplifier. The result indicates that the ratio of the pump power and seed power should not be higher than four for our amplifier if there is no special design to suppress amplified spontaneous emission.

Keywords

laser beams; laser transitions; optical fibre amplifiers; optical pumping; superradiance; ytterbium; M² factors; amplified spontaneous emission; efficiency 70 percent; efficiency 80 percent; high-power ytterbium-doped fiber amplifier; high-power ytterbium-doped fiber laser; laser beams; laser-diode-pumped fiber laser; master oscillator power amplifier configuration; power 178 W; power 253 W; power 309 W; seed power level; single-mode fiber laser; slope efficiency; wavelength 1120 nm; Fiber lasers; Laser excitation; Optical fiber amplifiers; Power amplifiers; Power generation; Power lasers; Pump lasers; Yb-doped fiber laser; high power; long wavelength;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2013.2280731

Filename

6588931