Title :
Switching of Lasing Circular Polarizations in a (110)-VCSEL
Author :
Ikeda, Kazuhiro ; Fujimoto, Toshiyasu ; Fujino, Hiroshi ; Katayama, Takeo ; Koh, Shinji ; Kawaguchi, Hitoshi
Author_Institution :
Grad. Sch. of Mater. Sci., Nara Inst. of Sci. & Technol., Ikoma, Japan
Abstract :
We discuss our demonstration of gigahertz switching of lasing circular polarizations in a (110) GaAs-based vertical-cavity surface-emitting laser (VCSEL) obtained by optical spin injection. The (110)-VCSEL´s significantly longer spin relaxation time (2.8 ns) than its carrier lifetime (0.42 ns) enabled it to consecutively oscillate in orthogonal circular polarizations with a high degree of circular polarization, when the time delay between two optical pump pulses with orthogonal circular polarizations was longer than 1 ns. Rate equation analysis closely reproduced the measured results.
Keywords :
III-V semiconductors; gallium arsenide; light polarisation; optical switches; semiconductor lasers; surface emitting lasers; GaAs; VCSEL; lasing circular polarizations; optical pump pulses; optical spin injection; rate equation analysis; switching; time 0.42 ns; time 2.8 ns; vertical-cavity surface-emitting laser; (110)-oriented quantum wells (QWs); quantum-well (QW) lasers; spin lasers; spin vertical-cavity surface-emitting lasers (VCSELs);
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2009.2026631
