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

Volume

6

Issue

12

fYear

1994

Firstpage

1409

Lastpage

1411

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;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/68.392228

Filename

392228