Regensburg 2019 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 3: Semiconductor lasers and Photonic crystals
HL 3.4: Talk
Monday, April 1, 2019, 10:15–10:30, H33
A theoretical model for the generation of non-equidistant pulses in passively mode-locked VECSELs — •Jan Hausen1, Stefan Meinecke1, Benjamin Lingnau1,2, and Kathy Lüdge1 — 1Institute for theoretical Physics, TU Berlin, Hardenbergstrasse 36, 10623 Berlin — 2Physics Department, University College Cork, College Rd, Cork, Irland
Embedding the active sections of a passively mode-locked laser, i.e. gain and absorber medium, in an external cavity with a V-shaped geometry can greatly enhance their performance in terms of pulse width and power. However, multi-pulse solutions with non-equidistant inter-pulse spacing (pulse clusters) emerge in these devices and limit their performance. We derive a system of multi-delay differential equations, which is simple enough to allow for large numeric parameter studies as well as a bifurcation analysis to understand the underlying bifurcation scenarios. We find that by tuning the cavity geometry different mode-locking behaviour can be favoured e.g. fundamental, higher harmonic or pulse cluster mode-locking. Furthermore, our investigations show that by increasing the cavity geometry stable regions of higher order pulse clusters develop from cusps of saddle-node bifurcation and stabilizing torus bifurcations.