Berlin 2012 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 86: Semiconductor Lasers
HL 86.9: Talk
Thursday, March 29, 2012, 17:15–17:30, EW 015
Investigation of the 2-color emission from a vertical-external-cavity surface-emitting laser — •Matthias Wichmann1, Alexej Chernikov1, Mohammad Khaled Shakfa1, Stephan W. Koch1, Martin Koch1, Maik Scheller2, and Jerome V. Moloney2 — 1Department of Physics and Materials Sciences Center, Philipps-Universität Marburg, Renthof 5, D-35032 Marburg, Germany — 2College of Optical Sciences, University of Arizona, 1630 E University Boulevard, Tucson, AZ, 85721, USA
Vertical-external-cavity surface-emitting lasers (VECSELs) combine an excellent output beam quality and high power operation. Furthermore, the external cavity makes the VECSEL ideally suited for intra-cavity frequency conversion. Recently, a high power, room temperature continuous wave terahertz source was demonstrated based on difference frequency generation within a nonlinear crystal that was placed inside a VECSEL cavity. For this kind of application, a stable two color operation is mandatory. Here, we present systematic measurements on the time dynamics of the two-color emission from a VECSEL using a streak camera. With this, time- and frequency resolved "snapshots" of the VECSEL emission are acquired and analyzed with respect to correlation and relative stability. By varying the pump power, different operation regimes could be realized. The results show that the VECSEL can be operated in a broad stable regime with both colors emitting simultaneously. Near the lasing threshold and the thermal roll-over, a breakdown of stability is observed.