Title :
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
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;
Journal_Title :
Selected Topics in Quantum Electronics, IEEE Journal of
DOI :
10.1109/JSTQE.2014.2312927
