Regensburg 2016 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 70: Semiconductor Lasers I

HL 70.9: Vortrag

Donnerstag, 10. März 2016, 12:00–12:15, H13

Investigations on pump-power dependences of a self-mode-locked VECSEL — •Max Vaupel, Mahmoud Gaafar, Fan Zhang, Christoph Möller, Wolfgang Stolz, Arash Rahimi-Iman, and Martin Koch — Faculty of Physics and Materials Sciences Center, Philipps-Universität Marburg, 35032 Marburg, Germany

Recently, self-mode-locked vertical-external-cavity surface-emitting lasers (SML-VECSEL) were presented as promising saturable-absorber-free pulsed lasers, although, up to now, the responsible effect is not fully understood. In this work, experimental studies have been performed in order to gain insight into the pump-power-dependent mode-locking behaviour of such a laser device and to foster the assumption of Kerr-lensing being significantly involved, by using a Z-cavity and a linear cavity configuration, respectively. The results show, that generating losses for the continuous-wave resonator mode with a well-placed hardaperture in the cavity leads to mode-locking and therefore pulsed operation for these resonator geometries. ABCD-matrix calculations for the intra-cavity beam radius as a function of a negative or positive Kerr lens inside the VECSEL-chip are in accordance with the obtained results.