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 108.17: Poster
Thursday, April 3, 2014, 17:00–20:00, P1
Non-heating losses and thermal resistance of VECSELs — •Dalia Al Nakdali1, Mohammad Khaled Shakfa1, Bernd Heinen1, Bernardette Kunert2, Wolfgang Stolz1, Stephan W. Koch1, Jörg Hader3, Jerome V. Moloney3, Arash Rahimi-Iman1, and Martin Koch1 — 1Faculty of Physics and Material Sciences Center, Philipps-University of Marburg, Renthof 5, 35032 Marburg, Germany — 2NAsP-III/V GmbH., Am Knechtacker 19, 35041 Marburg, Germany — 3College of Optical Sciences, University of Arizona, Tucson, Arizona 85721, USA
Optically-pumped vertical-external-cavity surface-emitting lasers (VECSELs) have recently received much attention due to their potential for application in scientific and industrial fields. Particularly, they are promising for continuous-wave (cw) high power operation. However, only a considerable improvement of the thermal management allows us to obtain cw VECSEL output-powers in excess of 100 W. Besides heating losses, non-heating power losses need to be analyzed for a deeper understanding of power-limiting factors in a VECSEL and for the improvement of its performance. In our present work, a standard V-cavity VECSEL configuration is employed. Input-output characteristics are recorded for different plane out-coupling mirrors and for varying heat sink temperatures. Here, we take into account optical-scattering losses to improve a theoretical model from which we extract the VECSEL-chips thermal resistance as well as its scattering coefficient from experimental input-output characteristics.