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HL: Fachverband Halbleiterphysik

HL 18: Lasers and LEDs I

HL 18.2: Talk

Monday, March 11, 2013, 15:15–15:30, H16

Red quantum dot based semiconductor disk laser — •Thomas Schwarzbäck, Roman Bek, Fabian Hargart, Christian A. Kessler, Hermann Kahle, Elisabeth Koroknay, Michael Jetter, and Peter Michler — Institut für Halbleiteroptik und Funktionelle Grenzflächen and Research Center SCoPE, Universität Stuttgart, Allmandring 3, 70569 Stuttgart, Germany

Since the pioneering work of Kuznetsov et al. in 1997, semiconductor disk lasers also known as vertical external cavity surface-emitting lasers (VECSELs) have excited growing interest in science. These kinds of lasers combine some advantages, which none of the remaining semiconductor laser sources can offer. High continuous-wave (cw) output power and near-diffraction-limited beam quality with a TEM00 Gaussian beam profile are somewhat unique. Meanwhile not only quantum wells but rather quantum dots (QDs) are used as gain material, where theory promises stunning properties like higher and broader gain or temperature insensitive low threshold. This make QD-VECSELs predestinated for lots of applications in various fields such as medicine, life sciences, display or projection applications and in research.

The QD-VECSEL is fabricated via metal-organic vapor-phase epitaxy. The fundamental laser emission around 650 nm is provided by InP QDs embedded in a separate confinement heterostructure. We will present laser characteristics as well as output powers exceeding 1.3 W.