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Optica Publishing Group
  • International Quantum Electronics Conference
  • OSA Technical Digest (Optica Publishing Group, 1998),
  • paper QTuG12

The role of carrier spin in polarization instabilities in VCSELs

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Abstract

Vertical-cavity surface-emitting Lasers (VCSELs) usually emit linearly polarized light oriented along a crystal axis. However, it is commonly observed that, as the current is further increased, the polarization orientation of the optical field switches to the orthogonal one while preserving the emission profile.1 This polarization switching (PS) has been explained as a result of thermal heating.2 This mechanism, however, cannot explain a recent experiment where PS was observed while keeping constant the VCSEL temperature.3 This experimental observation can also not be explained just by the linear effect of cavity anisotropies, a mechanism that also influences PS,4 An alternative explanation is offered by the spin-flip model (SFM),5 which takes into account the spin dynamics of carriers.

© 1998 Optical Society of America

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