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

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

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

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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.
Original languageEnglish
Title of host publicationVertical-Cavity Surface-Emitting Lasers XV
EditorsJ. K. Guenter, Chun Lei
Pages79520B
Number of pages8
Volume7952
DOIs
Publication statusPublished - 7 Feb 2011

Publication series

NameProc. SPIE
PublisherSPIE

Fingerprint

surface emitting lasers
oscillations
cavities
polarization
circular polarization
thresholds
excitation
continuous radiation
nonlinearity
injection
room temperature

Keywords

  • polarization oscillations
  • laser devices

Cite this

Ackemann, T., Li, M. Y., Jaehme, H., Soldat, H., Gerhardt, N. C., & Hofmann, M. R. (2011). Spin induced gigahertz polarization oscillations in vertical-cavity surface-emitting laser devices. In J. K. Guenter, & C. Lei (Eds.), Vertical-Cavity Surface-Emitting Lasers XV (Vol. 7952, pp. 79520B). (Proc. SPIE). https://doi.org/10.1117/12.873758
Ackemann, Thorsten ; Li, M. Y. ; Jaehme, H. ; Soldat, H. ; Gerhardt, N.C. ; Hofmann, M. R. / Spin induced gigahertz polarization oscillations in vertical-cavity surface-emitting laser devices. Vertical-Cavity Surface-Emitting Lasers XV. editor / J. K. Guenter ; Chun Lei. Vol. 7952 2011. pp. 79520B (Proc. SPIE).
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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.",
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Ackemann, T, Li, MY, Jaehme, H, Soldat, H, Gerhardt, NC & Hofmann, MR 2011, Spin induced gigahertz polarization oscillations in vertical-cavity surface-emitting laser devices. in JK Guenter & C Lei (eds), Vertical-Cavity Surface-Emitting Lasers XV. vol. 7952, Proc. SPIE, pp. 79520B. https://doi.org/10.1117/12.873758

Spin induced gigahertz polarization oscillations in vertical-cavity surface-emitting laser devices. / Ackemann, Thorsten; Li, M. Y.; Jaehme, H.; Soldat, H.; Gerhardt, N.C.; Hofmann, M. R.

Vertical-Cavity Surface-Emitting Lasers XV. ed. / J. K. Guenter; Chun Lei. Vol. 7952 2011. p. 79520B (Proc. SPIE).

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

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AB - 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.

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Ackemann T, Li MY, Jaehme H, Soldat H, Gerhardt NC, Hofmann MR. Spin induced gigahertz polarization oscillations in vertical-cavity surface-emitting laser devices. In Guenter JK, Lei C, editors, Vertical-Cavity Surface-Emitting Lasers XV. Vol. 7952. 2011. p. 79520B. (Proc. SPIE). https://doi.org/10.1117/12.873758