Regensburg 2016 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 70: Semiconductor Lasers I

HL 70.10: Vortrag

Donnerstag, 10. März 2016, 12:15–12:30, H13

Hybrid VCSEL and DFB Organic Microlasers — •Tim Wagner, Markas Sudzius, Andreas Mischok, Hartmut Fröb, and Karl Leo — Institut für Angewandte Photophysik, Technische Universität Dresden, George-Bähr-Str. 1, 01069 Dresden

Two of the numerous resonator architectures are the vertical-cavity surface-emitting laser (VCSEL), in which the laser mode is vertically confined between two highly reflective DBR mirrors, and the distributed-feedback laser (DFB), incorporating a horizontal waveguide with a periodic diffraction grating. We prepare these microlasers using an identical set of materials with Alq₃:DCM as the active medium. Although based on entirely different geometries and mechanisms, the two resonators exhibit similar lasing thresholds.

In this work, we design a continuously tunable hybrid device combining both resonators in a composite system, in which second-order Bragg diffraction serves as a coupling mechanism between vertical and lateral modes. Coherent interaction of the different resonances is observed and described by a coupled oscillator model. The analysis of mode dispersions and lasing characteristics leads to the identification of the different mechanisms on optical feedback and losses. Based on the results obtained, novel structures are designed to balance the performances of the vertical and lateral resonator inside the hybrid device.