Dynamic gratings induced by mode instabilities in fiber lasers

Pavel Peterka; Jan Aubrecht; Jakub Cajzl; Ondřej Podrazký; Filip Todorov; Ivan Kašík; Pavel Honzátko

doi:10.1117/12.2514458

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18 December 2018 Dynamic gratings induced by mode instabilities in fiber lasers

Pavel Peterka, Jan Aubrecht, Jakub Cajzl, Ondřej Podrazký, Filip Todorov, Ivan Kašík, Pavel Honzátko

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Proceedings Volume 10976, 21st Czech-Polish-Slovak Optical Conference on Wave and Quantum Aspects of Contemporary Optics; 109760H (2018) https://doi.org/10.1117/12.2514458
Event: 21st Czech-Polish-Slovak Optical Conference on Wave and Quantum Aspects of Contemporary Optics, 2018, Lednice, Czech Republic

Abstract

We review the results of investigation of a special mode of self-pulsing, longitudinal-mode-instability regime, so-called self-induced laser line sweeping. This description reflects the fact that the self-pulsing (in the form of self-sustained relaxation oscillations) coexists with a spectacular laser line drift with time. It is accompanied by creation of dynamic refractive index gratings along the active fiber in the laser cavity. Such gratings have pitch of less than a micrometer, defined by half of the wavelength of the laser mode responsible for the grating build-up. Although longitudinal mode instabilities in fiber lasers are known for a long time, the associated refractive index gratings were studied just recently. An estimation of reflectivity of the dynamics gratings in self-swept fiber lasers is given using numerical model.

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Pavel Peterka, Jan Aubrecht, Jakub Cajzl, Ondřej Podrazký, Filip Todorov, Ivan Kašík, and Pavel Honzátko "Dynamic gratings induced by mode instabilities in fiber lasers", Proc. SPIE 10976, 21st Czech-Polish-Slovak Optical Conference on Wave and Quantum Aspects of Contemporary Optics, 109760H (18 December 2018); https://doi.org/10.1117/12.2514458

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