Experiments and Perturbative Analysis of Dammann-Grating-Based Aperture Filling in a Passive Coherent Beam Combination

Author

Houkang Liu ; Bing He ; Jun Zhou ; Yifeng Yang ; Ye Zheng ; Man Hu ; Qihong Lou

Author_Institution

Shanghai Key Lab., Shanghai Inst. of Opt. & Fine Mech., Shanghai, China

Volume

32

Issue

12

fYear

2014

fDate

June15, 15 2014

Firstpage

2220

Lastpage

2227

Abstract

A Dammann-grating-based aperture filling technology is demonstrated in a passive coherent beam combination fiber amplifier array, which is phase-locked using an all-optical feedback loop. The maximum output power is 206 W. The combined efficiency of a three channels aperture filling is discussed and demonstrated to vary with the output power. Perturbative factors leading to the loss of the combined efficiency are theoretically simulated and the key factor is the residual phase error. Theoretical and experimental results show that this technology has good potential to achieve higher brightness in a single beam.

Keywords

diffraction gratings; laser arrays; laser beams; laser feedback; laser mode locking; optical fibre amplifiers; optical fibre losses; Dammann-grating-based aperture filling technology; all-optical feedback loop; brightness; channel aperture filling; output power; passive coherent beam combination fiber amplifier array; perturbative analysis; phase-locking; power 206 W; residual phase error; Apertures; Fiber lasers; Filling; Laser beams; Optical fiber amplifiers; Power amplifiers; Power generation; Aperture filling; Dammann grating; coherent beam combination; fiber lasers;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/JLT.2014.2322863

Filename

6814288