Open-cavity fiber laser with distributed feedback based on externally or self-induced dynamic gratings

Ivan A. Lobach, Roman V. Drobyshev, Andrei A. Fotiadi, Evgeniy V. Podivilov, Sergey I. Kablukov, Sergey A. Babin

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

Dynamic population inversion gratings induced in an active medium by counter-propagating optical fields may have a reverse effect on writing laser radiation via feedback they provide. In this Letter we report, to the best of our knowledge, on the first demonstration of an open-cavity fiber laser in which the distributed feedback is provided by a dynamic grating “written” in a Yb-doped active fiber, either by an external source or self-induced via a weak (~0.1%) reflection from an angle-cleaved fiber end. It has been shown that meters-long dynamic grating is formed with a narrow bandwidth (<50 MHz) and a relatively high-reflection coefficient (>7%) securing single-frequency operation, but the subsequent hole-burning effects accompanied by new grating formation lead to the switching from one longitudinal mode to another. providing a regular pulse-mode dynamics. As a result, periodically generated pulse trains cover a spectrum range of several terahertz delivering millions of cavity modes in sequent pulses.

Original languageEnglish
Pages (from-to)4207-4210
Number of pages4
JournalOptics Letters
Volume42
Issue number20
DOIs
Publication statusPublished - 15 Oct 2017

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