Berlin 2012 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 3: Focus Session: VECSEL
HL 3.2: Topical Talk
Montag, 26. März 2012, 10:00–10:30, ER 164
Intra-cavity frequency doubling in visible VECSELs towards high efficiency UV laser emission — •Thomas Schwarzbäck, Hermann Kahle, 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, 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. Furthermore the possibility of bandgap engineering make VECSELs predestinated for lots of applications in various fields such as medicine, life sciences, display or projection applications and in research. Besides these compelling arguments, the VECSEL offers an additional feature resulting from the external cavity. Using optical elements in the external resonator like frequency selecting filters allow for spectral tuning and with non-linear crystals efficient intra-cavity frequency doubling can be provided. The fundamental laser emission is provided by a red emitting VECSEL fabricated via metal-organic vapour-phase epitaxy. Using a compact v-shaped cavity, it is possible to generate UV laser emission at a wavelength of 330 nm with output powers in the 100 mW regime with a tuning range of several nanometers.