TY - JOUR

T1 - Open-cavity fiber laser with distributed feedback based on externally or self-induced dynamic gratings

AU - Lobach, Ivan A.

AU - Drobyshev, Roman V.

AU - Fotiadi, Andrei A.

AU - Podivilov, Evgeniy V.

AU - Kablukov, Sergey I.

AU - Babin, Sergey A.

PY - 2017/10/15

Y1 - 2017/10/15

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=85031306305&partnerID=8YFLogxK

U2 - 10.1364/OL.42.004207

DO - 10.1364/OL.42.004207

M3 - Article

C2 - 29028049

AN - SCOPUS:85031306305

VL - 42

SP - 4207

EP - 4210

JO - Optics Letters

JF - Optics Letters

SN - 0146-9592

IS - 20

ER -