Dresden 2009 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 9: Poster 1

HL 9.110: Poster

Montag, 23. März 2009, 14:30–17:00, P2

Mode characteristics of red VCSEL with oxide-confined aperture — •Susanne Weidenfeld, Michael Wiesner, Marcus Eichfelder, Robert Roßbach, Michael Jetter, and Peter Michler — Institut für Halbleiteroptik und Funktionelle Grenzflächen, Universität Stuttgart, Allmandring 3, 70569 Stuttgart, Germany

For optical data transmission over short distances polymer optical fibers (POF) are the preferred low cost medium due to their relatively high mechanical flexibility and the large core diameter. Red vertical-cavity surface-emitting lasers (VCSEL) target one absorption minimum of the POF at around 650 nm and exhibit circular beam profile and low divergence angle for an easy coupling of light into the fiber.

Our AlGaInP-based devices are grown by metal-organic vapor-phase epitaxy (MOVPE). They have low threshold current (<1mA) and an optical output power up to 4 mW. For practical application a stable single transverse mode especially the fundamental mode and a stable polarization of the emission is desirable owing to higher coupling-efficiency in optical fibers.

In the current work we investigate the beam-profile depending on different parameters. The transverse mode profile is analyzed regarding aperture and mesa size. Also the influence of operation current and temperature on the mode shape is investigated. Measurements of the divergence angle and the polarization of the modes are presented.