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HL: Fachverband Halbleiterphysik

HL 5: Semiconductor Lasers

HL 5.7: Vortrag

Montag, 12. März 2018, 11:15–11:30, EW 202

Nonlinear lensing in a vertical-external-cavity surface-emitting laser — •Christian Kriso, Tasnim Munshi, Sascha Kress, Mohib Alvi, Wolfgang Stolz, Martin Koch, and Arash Rahimi-Iman — Philipps-Universität Marburg, 35032 Marburg, Germany

Passively mode-locked semiconductor disk lasers (SDLs), also known as vertical-external-cavity surface-emitting lasers (VECSELs), present a cost-efficient and wavelength-flexible alternative to conventional solid-state lasers. However, most mode-locked SDLs rely on the use of an additional saturable absorber element setting constraints on compactness and peak powers. Recently, a new, saturable-absorber-free mode-locking technique has shown promising results in terms of pulse duration and peak power. The underlying mechanism is assumed to be Kerr-lens mode-locking but the observation of self-mode-locking behavior is still not well understood. In order to gain a deeper understanding of nonlinear lensing in a VECSEL chip, we investigate the influence of optical pumping and the operation wavelength on the measured nonlinear refractive index via z-scan measurements close to real operation conditions.