Dresden 2011 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 88: Lasers
HL 88.5: Vortrag
Freitag, 18. März 2011, 11:15–11:30, POT 151
Red-emitting, highly polarized vertical-cavity surface-emitting lasers as lighting module for active microoptics — •Susanne Weidenfeld1, Michael Wiesner1, Marcus Eichfelder1, Frederik Schaal2, Christof Pruss2, Wolfgang Osten2, Robert Roßbach1, Michael Jetter1, and Peter Michler1 — 1Institut für Halbleiteroptik und Funktionelle Grenzflächen, Universität Stuttgart, Allmandring 3, 70569 Stuttgart, Germany — 2Institut für Technische Optik, Universität Stuttgart, Pfaffenwaldring 9, 70569 Stuttgart, Germany
AlGaInP-based vertical-cavity surface-emitting lasers (VCSELs) are attractive candidates for optical data transmission via polymer optical fibers (POF) meeting the POF’s attenuation minimum at around 650 nm. For different applications the fundamental mode is desirable as well as a stable linear polarization. This is especially essential for the implementation of the VCSEL as a lighting module in a device that spatially resolved controls the polarization of incident light. With the monolithic integration of an oxide aperture, the transverse beam profile can be defined. The vertical structure of these lasers and thus the on-wafer processing offers also the opportunity to implement beam shaping optics monolithically in the surface. We present detailed analysis of the transverse beam profile and polarization characteristics of VCSELs. We demonstrate that oxide aperture sizes smaller than 6 µm are required for emission in fundamental mode and that the devices are highly linearly polarized. We further show first steps towards integrating beam shaping optics into the top mirror of the VCSEL.