High Power Narrow-Linewidth Nanosecond All-Fiber Lasers and their Actively Coherent Beam Combination

Author

Rongtao Su ; Pu Zhou ; Xiaolin Wang ; Yanxing Ma ; Hu Xiao ; Pengfei Ma ; Xiaojun Xu ; Zejin Liu

Author_Institution

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

Volume

20

Issue

5

fYear

2014

fDate

Sept.-Oct. 2014

Firstpage

206

Lastpage

218

Abstract

We present theoretical and experimental research on high power narrow-linewidth nanosecond all-fiber lasers and their actively coherent beam combination (CBC). Nonlinear effects limitations of nanosecond pulses, such as stimulated Brillion scattering (SBS), stimulated Raman scattering (SRS), are discussed. SRS limited narrow-linewidth nanosecond all-fiber laser with average power of 913 W is obtained. A novel double-frequency nanosecond SRS nonlinear amplifier is proposed, which can be used to further scale the output power. CBC system for nanosecond fiber lasers is theoretically analyzed in detail. Effects of aberrations on CBC of nanosecond fiber lasers are theoretically discussed. We also experimentally researched CBC of nanosecond lasers with low repetition rate and high average power, respectively. Combined pulses with peak power of 21.5 kW are obtained.

Keywords

aberrations; laser beams; light coherence; nonlinear optics; optical fibre amplifiers; optical harmonic generation; spectral line narrowing; stimulated Brillouin scattering; stimulated Raman scattering; aberration effects; actively coherent beam combination; double-frequency nanosecond SRS nonlinear amplifier; high power narrow-linewidth nanosecond all-fiber lasers; nonlinear effect limitations; power 21.5 kW; power 913 W; stimulated Brillouin scattering; stimulated Raman scattering; Fiber lasers; Laser beams; Laser excitation; Optical fiber amplifiers; Power lasers; Scattering; Optical pulses; coherent beam combining; nonlinear optics; optical fiber amplifiers;

fLanguage

English

Journal_Title

Selected Topics in Quantum Electronics, IEEE Journal of

Publisher

ieee

ISSN

1077-260X

Type

jour

DOI

10.1109/JSTQE.2014.2312927

Filename

6776403