Title :
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
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;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2015.2461631
