Title :
Surface-emitting semiconductor lasers with multi-functional grating couplers
Author :
Modh, Peter ; Backlund, Johan ; Bengtsson, Jörgen ; Larsson, Anders
Author_Institution :
Dept. of Microelectron., Chalmers Univ. of Technol., Goteborg, Sweden
Abstract :
We report considerable improvements in the beam quality of an unstable-resonator laser integrated with two different outcouplers designed using this new principle. In the first example, the coupler is designed for harmless feedback characteristics while producing four focused spots in free space, and in the second example, the coupler provides the feedback needed for the desired mode of operation of the laser (eliminating one of the feedback gratings) while simultaneously producing a focused spot in free space.
Keywords :
diffraction gratings; laser beams; laser feedback; laser modes; optical design techniques; optical focusing; semiconductor lasers; surface emitting lasers; beam quality; feedback gratings; focused spots; free space; harmless feedback characteristics; laser modes; multi-functional grating couplers; surface-emitting semiconductor lasers; unstable-resonator laser; Couplers; Focusing; Gratings; Laser beams; Laser feedback; Laser modes; Optical design; Semiconductor lasers; Surface emitting lasers; Threshold current;
Conference_Titel :
Semiconductor Laser Conference, 2002. IEEE 18th International
Print_ISBN :
0-7803-7598-X
DOI :
10.1109/ISLC.2002.1041127
