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HL: Fachverband Halbleiterphysik

HL 88: Lasers

HL 88.4: Vortrag

Freitag, 18. März 2011, 11:00–11:15, POT 151

Thermal properties of high power vertical-external-cavity surface-emitting lasers — •Alexej Chernikov¹, Jens Herrmann¹, Maik Scheller¹, Martin Koch¹, Bernadette Kunert¹, Wolfgang Stolz¹, Sangam Chatterjee¹, Stephan W. Koch¹, Tsuei-Lian Wang², Yushi Kaneda², Joe M. Yarborough², Jörg Hader², and Jerome V. Moloney² — ¹Faculty of Physics and Material Sciences Center, Philipps-Universität Marburg, Renthof 5, D-35032 Marburg, Germany — ²College of Optical Sciences, The University of Arizona, 1630East University Boulevard, Tucson, AZ 85721, USA

Vertical-external-cavity surface-emitting lasers (VECSELs), developed in the late 90s, have received much attention in the scientific community due to the unique combination of high output power and excellent beam quality. VECSELs provide light across a broad spectral range, efficient intra-cavity frequency mixing as well as the possibility for pulsed operation. The majority of the applications rely on the high output power of the device. Since overheating generally limits the laser performance, efficient cooling concepts as well as careful choice of the pump profile are crucial. Here, we focus on the thermal properties of a high-power VECSEL. Spatially resolved temperature measurements are performed under simultaneous monitoring of the output characteristics of the device. Our results illustrate the substantial importance of three-dimensional heat transfer in the structure, limiting the VECSEL performance for large spot sizes. Finally, the heat-removal concept is optimized for a maximum output power above 70 W.