Title :
Actively Coherent Beam Combining of Two Single-Frequency 1083 nm Nanosecond Fiber Amplifiers in Low-Repetition-Rate
Author :
Rongtao Su ; Pu Zhou ; Xiaolin Wang ; Pengfei Ma ; Xiaojun Xu
Author_Institution :
Coll. of Opto-Electron. Sci. & Eng., Nat. Univ. of Defense Technol., Changsha, China
Abstract :
We report on an experiment of active coherent beam combining (CBC) of two single-frequency nanosecond fiber amplifiers with repetition rate of several kilohertz using stochastic parallel gradient descent algorithm. Pulsed lasers with pulse width of ~500 ns and repetition rate of 5 kHz are phase locked with a combining efficiency of 89% by employing the signal leakage between the pulses for phase locking. This method can be used to CBC of pulsed-pumped laser with lower repetition rate.
Keywords :
high-speed optical techniques; laser beams; laser mode locking; light coherence; optical fibre amplifiers; optical pumping; actively coherent beam combining; frequency 5 kHz; low-repetition-rate; phase locking; pulse width; pulsed-pumped laser; signal leakage; single-frequency nanosecond fiber amplifiers; stochastic parallel gradient descent algorithm; wavelength 1083 nm; Coherent beam combining (CBC); fiber-optics amplifiers and oscillators; optical pulses; single-frequency lasers;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2013.2267892
