Title :
Beam instability in 980-nm power lasers: experiment and analysis
Author :
Guthrie, James ; Tan, G.L. ; Ohkubo, M. ; Fukushima, T. ; Ikegami, Y. ; Ijichi, T. ; Irikawa, M. ; Mand, R.S. ; Xu, J.M.
Author_Institution :
Dept. of Electr. & Comput. Eng., Toronto Univ., Ont., Canada
Abstract :
A theoretical analysis of beam instability (steering), commonly observed in high power ridge waveguide laser diodes is presented. A physical model of multiple interfering lateral modes is proposed and implemented in a two-dimensional self-consistent numerical code. It is shown that the dynamic evolution of the effective waveguide and the coherent lasing of emergent multiple lateral modes of the waveguide under high injection could lead to beam steering and knees in the fiber coupled L-I characteristics. The theory of simultaneous lasing and interaction between several lateral modes is found to be consistent with the observed back-plane radiation image.<>
Keywords :
codes; laser beams; laser modes; laser stability; laser theory; semiconductor device models; semiconductor lasers; waveguide lasers; 980-nm power lasers; back-plane radiation image; beam instability; coherent lasing; dynamic evolution; effective waveguide; emergent multiple lateral modes; fiber coupled L-I characteristics; high injection; high power ridge waveguide laser diodes; multiple interfering lateral modes; physical mo; simultaneous lasing; steering; two-dimensional self-consistent numerical code; Beam steering; Diode lasers; Knee; Laser beams; Laser modes; Laser theory; Optical fiber theory; Power lasers; Waveguide lasers; Waveguide theory;
Journal_Title :
Photonics Technology Letters, IEEE
