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Proceedings Paper

Pseudo mode-locking
Author(s): Esmerando Escoto; Günter Steinmeyer
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Paper 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.

Paper Details

Date Published: 2 March 2020
PDF: 3 pages
Proc. SPIE 11263, Vertical External Cavity Surface Emitting Lasers (VECSELs) X, 1126306 (2 March 2020); doi: 10.1117/12.2542858
Show Author Affiliations
Esmerando Escoto, Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie (Germany)
Günter Steinmeyer, Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie (Germany)
Humboldt Univ. (Germany)

Published in SPIE Proceedings Vol. 11263:
Vertical External Cavity Surface Emitting Lasers (VECSELs) X
Jennifer E. Hastie, Editor(s)

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