München 2004 – scientific programme
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Q: Quantenoptik und Photonik
Q 9: Festkörper- und Halbleiterlaser
Q 9.6: Talk
Monday, March 22, 2004, 17:45–18:00, HS 218
Time-varying elliptically polarized states in vertical-cavity surface-emitting lasers — •Thorsten Ackemann1, Markus Sondermann1, Salvador Balle2, and Josep Mulet2 — 1Institut für Angewandte Physik, Westfälische Wilhelms-Universität Münster, Corrensstr. 2-4, 48149 Münster, Germany — 2Instituto Mediterráneo de Estudios Avanzados (IMEDEA), Universitat de les Illes Balears, E-07071 Palma de Mallorca, Spain
The polarization dynamics of vertical-cavity surface-emitting lasers (VCSELs) has been debated intensively over the past years. In this contribution, we focus on elliptically polarized time-varying, i.e. dynamical states (DS). These states occur in the vicinity of a polarization switching (PS) event from the fundamental polarization mode with the longer wavelength to the mode with shorter wavelength and orthogonal linear polarization [1,2].
The properties of these states are studied experimentally and theoretically in dependency on parameters (current and ambient temperature) and strain conditions. A direct manifestation of the DS in the time domain is found by oscillations of the polarization components at a frequency of a few gigahertz. For the theoretical interpretation an extended version of the so-called spin-flip model is used, which takes into account explicitly the spin degrees of freedom of the light field and of carriers in the semiconductors quantum wells [2].
[1] J. Martín-Regalado et al., IEEE J. Quantum Electron. 33, 765 (1997); T. Ackemann, and M. Sondermann, Appl. Phys. Lett. 78, 3574 (2001).
[2] S. Balle et al., Opt. Lett. 24, 1121 (1999).