Berlin 2018 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 33: Delay and Feedback Dynamics

DY 33.4: Talk

Tuesday, March 13, 2018, 14:45–15:00, BH-N 334

Dynamics and bifurcation analysis of a passively mode-locked v-shaped semiconductor laser — •Anna-Belle Garten, Lina Jaurigue, and Kathy Lüdge — Institut f. Theo. Physik, Sekr. EW 7-1,Technische Universtität Berlin, Berlin, Germany

Passively mode-locked vertical external-cavity surface-emitting lasers (VECSEL) can produce femtoseconds pulses with high peak powers [1]. These lasers are of interest for driving nonlinear optical processes, e.g. frequency doubling for material processing and multiphoton microscopy. VECSEL mode-locked lasers typically have a v-shaped cavity, i.e. the pulse passes through gain chip twice per roundtrip.

In this contribution we investigate the influence of the geometry on the dynamics. We model the system with a set of coupled delay differential equations which take into account the v-shaped geometry. We solve these equations numerical and analyse the bifurcations of this system. Solutions are found which are not found in an equivalent linear cavity, e.g. double pulse solutions with identical puls heights but asymmetric interspike interval time. These solutions differ from double pulse solutions found in [2]. In [2] the solutions are long lived transients, arising due to the long cavity round trip time compared with the time scales of the carrier dynamics. Whereas in the v-shaped cavity they are stable solutions arising due to the geometry.

[1]C. Alfieri, D. Waldburger, S. Link, E. Gini, M. Golling, G. Eisenstein, and U. Keller, Opt. Express 25, 6402-6420 (2017)

[2] M. Marconi, J. Javaloyes, S. Balle, and M. Giudici, OSA Technical Digest (online) (Optical Society of America, 2014), paper NW3A.8.