Title :
Variable reflectance vertical cavity surface emitting lasers
Author :
Lehman, A.C. ; Yamaoka, E.A. ; Willis, C.W. ; Choquette, K.D. ; Geib, K.M. ; Allerman, A.A.
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Illinois, IL
Abstract :
Singlemode operation in 850 nm vertical cavity surface emitting lasers is reported. The singlemode behaviour results from a radially-varying number of periods in the top distributed Bragg reflector mirror. At the centre of the device there are six additional quarter-wave layers (three periods) as compared to the edge. This provides higher mirror reflectivity to the fundamental mode without adding loss. Thus the top mirror geometry promotes singlemode operation of the laser from threshold to rollover
Keywords :
distributed Bragg reflectors; surface emitting lasers; 850 nm; distributed Bragg reflector mirror; mirror reflectivity; singlemode operation; variable reflectance vertical cavity surface emitting lasers;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:20070429
