Modal Analysis of Fiber Laser Beam by Using Stochastic Parallel Gradient Descent Algorithm

Author

Liangjin Huang ; Haibin Lu ; Pu Zhou ; Jinyong Leng ; Shaofeng Guo ; Xiang´ai Cheng

Author_Institution

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

Volume

27

Issue

21

fYear

2015

Firstpage

2280

Lastpage

2283

Abstract

The ability of modal decomposition based on the analysis of the near-field intensity profile using the stochastic parallel gradient descent algorithm is experimentally characterized in detail for the first time. The results show that the decomposition method proposed in this letter turns to be highly accurate and rapid. Further, this method is applied to analyze the mode behavior in dependence on the pump power in a high-power fiber amplifier with different initial mode compositions.

Keywords

gradient methods; laser beams; laser modes; modal analysis; optical fibre amplifiers; optical pumping; stochastic processes; fiber laser beam; high-power fiber amplifier; modal analysis; modal decomposition; mode compositions; near-field intensity profile; pump power; stochastic parallel gradient descent algorithm; Image reconstruction; Laser beams; Optical fiber amplifiers; Optical fiber devices; Optical fiber polarization; Optimized production technology; Fiber characterization; fiber optics; high power fiber laser; large-mode-area fiber;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2015.2461631

Filename

7169556