Title :
Self-consistent modeling of beam instabilities in 980-nm fiber pump-lasers
Author :
Tan, Gen-Lin ; Mand, R.S. ; Xu, Jimmy M.
Author_Institution :
Dept. of Electr. Eng., Toronto Univ., Ont., Canada
fDate :
8/1/1997 12:00:00 AM
Abstract :
Emission nonlinearities such as kinks in the L-I characteristic and beam steering have often been observed in semiconductor power lasers that were designed for single-mode operation. A physical model of these phenomena is presented in which they are attributed to effects of the lasing and coherent coupling of multiple lateral modes. This model has been implemented self-consistently in a finite-element scheme. Simulation results for a typical 980-nm fiber pump laser are described and are found to be in good qualitative agreement with experimental observations. This agreement includes bilateral steering of the peak field, nonsymmetric emission field intensity in a symmetric device, nonlinearity and kinks in the L-I characteristics, and beating patterns in the back plane image
Keywords :
fibre lasers; finite element analysis; laser beams; laser modes; laser stability; laser theory; semiconductor device models; semiconductor lasers; 980 nm; L-I characteristics; back plane image; beam instabilities; beam steering; beating patterns; bilateral steering; coherent coupling; emission nonlinearities; fiber pump laser; fiber pump-lasers; kinks; lasing; multiple lateral modes; nonlinearity; nonsymmetric emission field intensity; peak field; self-consistent modeling; semiconductor power laser; single-mode operation; symmetric device; Beam steering; Fiber lasers; Finite element methods; Laser beams; Laser modes; Laser theory; Optical design; Power lasers; Pump lasers; Semiconductor lasers;
Journal_Title :
Quantum Electronics, IEEE Journal of
