Pseudo mode-locking

Esmerando Escoto; Günter Steinmeyer

doi:10.1117/12.2542858

2 March 2020 Pseudo mode-locking

Esmerando Escoto, Günter Steinmeyer

Proceedings Volume 11263, Vertical External Cavity Surface Emitting Lasers (VECSELs) X; 1126306 (2020) https://doi.org/10.1117/12.2542858
Event: SPIE LASE, 2020, San Francisco, California, United States

Abstract

Today the generation of femtosecond laser pulses nearly exclusively relies on passive mode-locking, which requires a phase lock between the longitudinal modes of a laser. In order to overcome the non-equidistance of the cold cavity modes, it is generally considered necessary to include an effective saturable absorption mechanism in the laser cavity. However, there exists a number of experimental demonstrations of mode-locking in which saturable absorption was clearly absent. Here we show that four-wave mixing may equally well lead to a mode-locking effect. However, the resulting pulse trains are only partially coherent, and the comb structures lack perfect equidistance. Operation of lasers in the pseudo mode-locked regime can easily be confused with traditional mode-locking. We discuss indications and characterization approaches for unveiling pseudo mode-locking.

Conference Presentation

Citation Download Citation

Esmerando Escoto and Günter Steinmeyer "Pseudo mode-locking", Proc. SPIE 11263, Vertical External Cavity Surface Emitting Lasers (VECSELs) X, 1126306 (2 March 2020); https://doi.org/10.1117/12.2542858

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