Circularly polarized lasing in a (110)-oriented quantum well vertical-cavity surface-emitting laser under optical spin injection

Fujino, Hiroshi; Koh, Shinji; Iba, Satoshi; Fujimoto, Toshiyasu; Kawaguchi, Hitoshi
March 2009
Applied Physics Letters;3/30/2009, Vol. 94 Issue 13, p131108
Academic Journal
We fabricated and characterized a vertical-cavity surface-emitting laser (VCSEL) based on (110) InGaAs/GaAs multiple quantum wells (MQWs). Circularly polarized lasing in the (110) VCSEL by optical injection of spin-polarized electrons has been demonstrated at 77 K and room temperature. A high degree of circular polarization, 0.94, was observed at 77 K, reflecting the long electron spin relaxation time in the (110) MQWs.


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