Spin induced gigahertz polarization oscillations in vertical-cavity surface-emitting laser devices

M. Y. Li; H. Jaehme; H. Soldat; N. C. Gerhardt; M. R. Hofmann; T. Ackemann

doi:10.1117/12.873758

7 February 2011 Spin induced gigahertz polarization oscillations in vertical-cavity surface-emitting laser devices

M. Y. Li, H. Jaehme, H. Soldat, N. C. Gerhardt, M. R. Hofmann, T. Ackemann

Proceedings Volume 7952, Vertical-Cavity Surface-Emitting Lasers XV; 79520B (2011) https://doi.org/10.1117/12.873758
Event: SPIE OPTO, 2011, San Francisco, California, United States

Abstract

Spin-controlled vertical-cavity surface-emitting lasers (VCSELs) have been intensively studied in recent years because of the low threshold feasibility and the nonlinearity above threshold, which make spin-VCSELs very promising for spintronic devices. Here we investigate the circular polarization dynamics of VCSELs on a picosecond time scale after pulsed optical spin injection at room temperature. A hybrid excitation technique combining continuous-wave (cw) unpolarized electrical excitation slightly above threshold and pulsed polarized optical excitation is applied. The experimental results demonstrate ultrafast circular polarization oscillations with a frequency of about 11 GHz. The oscillations last inside the first undulation of the intensity relaxation oscillations. Via theoretical calculations based on a rate equation model we analyze these oscillations as well as the underlying physical mechanisms.

Citation Download Citation

M. Y. Li, H. Jaehme, H. Soldat, N. C. Gerhardt, M. R. Hofmann, and T. Ackemann "Spin induced gigahertz polarization oscillations in vertical-cavity surface-emitting laser devices", Proc. SPIE 7952, Vertical-Cavity Surface-Emitting Lasers XV, 79520B (7 February 2011); https://doi.org/10.1117/12.873758

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