Abstract

Spin controlled vertical-cavity surface-emitting lasers (VCSELs) have several beneficial features, such as threshold reduction and circularly polarized lasing. We previously demonstrated 1-GHz switching between lasing circular polarizations with two opposite directions in a VCSEL based on a (110)-oriented multiple quantum well (MQW) with a degree of circular polarization higher than 0.9 [1]. Shortening the carrier lifetime τc while preserving the electron spin relaxation time τs is a straightforward solution to switching the lasing circular polarizations faster since residual electrons in the MQW deteriorate the degree of spin polarization. We therefore introduced micropost structures in a (110)-MQW. However, we could not measure τs in microposts smaller than 2 μm due to the time resolution of the streak camera (~25 ps) [2]. Although use of the microposts with a fast non-radiative surface recombination is a promising approach for faster polarization switching in spin-controlled VCSELs, it is still unclear if τs in useful post sizes smaller than 2 μm can be kept long. In this work, we measured τc and τs in (110) GaAs/AlGaAs MQW microposts with special attention to those smaller than 2 μm using a pump probe-based time-resolved Kerr rotation (TRKR) technique. We also report the results of rate equation analysis in a micropost VCSEL using the measured τc and τs.

© 2013 IEEE

PDF Article
More Like This
(110)-Oriented GaAs/AlGaAs Multiple Quantum Well Microposts for High-Speed Polarization Switching of Spin-Controlled VCSELs

N. Yokota, K. Ikeda, and H. Kawaguchi
CFIE_P_31 International Quantum Electronics Conference (IQEC) 2013

Optically-pumped circularly polarized lasing in a (110) VCSEL with GaAs/AlGaAs QWs at room temperature

Satoshi Iba, Shinji Koh, Kazuhiro Ikeda, and Hitoshi Kawaguchi
JTuI92 CLEO: Applications and Technology (CLEO_AT) 2011

Optically-pumped circularly-polarized lasing in a (110)-oriented VCSEL based on InGaAs/GaAs QWs

Hiroshi Fujino, Satoshi Iba, Toshiyasu Fujimoto, Shinji Koh, and Hitoshi Kawaguchi
CMRR5 Conference on Lasers and Electro-Optics (CLEO) 2009

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription