Dresden 2014 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 108: Poster: Ultra-fast phenomena / Optical properties / Semiconductor laser / Devices and device concepts

HL 108.15: Poster

Thursday, April 3, 2014, 17:00–20:00, P1

Toward high-power passively mode-locked VECSELs in the red spectral range — •Grizelda Kersteen, Roman Bek, Hermann Kahle, Thomas Schwarzbäck, Michael Jetter, and Peter Michler — Institut für Halbleiteroptik und Funktionelle Grenzflächen and Research Center SCoPE, Universität Stuttgart, Allmandring 3, 70569 Stuttgart, Germany

Research during the past decade focusing on semiconductor saturable absorber mirrors (SESAMs) and vertical external-cavity surface-emitting lasers (VECSELs) has been extremely thorough in optimizing pulse duration and output power in the infrared region. However, in 2013 our group could realize the first mode-locked VECSEL in the red spectral range emitting sub-250 fs pulses with a repetition rate of 836 MHz at around 664 nm. Due to the plane diamond heatspreader bonded onto the gain structure, side pulses appear reducing the peak power.

In this contribution, we present different approaches for improvements of this first setup. To suppress the Fabry-Pérot etalon induced side pulses, we use an anti-reflection coated wedged diamond instead. The effect of an increased repetition rate on the mode locking operation is investigated by reducing the cavity length. Furthermore, we investigate different gain and absorber structures containing quantum dots instead of quantum wells inside. These provide more flexibility concerning both the gain and the absorber properties such as temperature behavior and saturation fluence.