Numerical investigation of the impact of the saturable absorber recovery time on the mode-locking performance of fiber lasers

Jinho Lee, Suhyoung Kwon, Ju Han Lee

Research output: Contribution to journalArticlepeer-review

34 Scopus citations

Abstract

We investigated the impact of the recovery time of a saturable absorber (SA) on the mode-locking performance of a fiber laser. This study was conducted for two types of fiber cavities with different net cavity group velocity dispersion (GVD) at a wavelength of 1.55 μm: normal and anomalous. The impact of modulation depth variation was also analyzed. It was found that the recovery time of the SA has little influence on the output pulse characteristics in the case of the anomalous net cavity GVD due to an interplay between saturable absorption-induced pulse shaping and modulation instability-induced soliton evolution, irrespective of the SA operating in the fast or slow saturable absorption regime. However, the recovery time was found to have a significant impact on the output pulse characteristics for the case of a normal net cavity GVD. An SA operating in the fast saturable absorption regime produces mode-locked pulses with symmetric temporal shapes for the normal GVD cavity, whereas asymmetric pulses are generated in the slow saturable absorption regime. From the simulation results, the optimum recovery time range for fiber laser mode-locking is discussed.

Original languageEnglish
Article number9063458
Pages (from-to)4124-4132
Number of pages9
JournalJournal of Lightwave Technology
Volume38
Issue number15
DOIs
StatePublished - 1 Aug 2020

Keywords

  • Fiber lasers
  • cavity dispersion
  • mode-locking
  • saturable absorber

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