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Title: Mechanism of spontaneous switching of polarisation in an ytterbium-doped fibre laser

Abstract

The regime of polarisation switching in a double-clad ytterbium fibre laser is studied experimentally and explained theoretically. It is shown that polarisation switching appears in lasers with the long active medium (no less than 20 m) when the pump slightly exceeds the threshold. The experimentally observed properties of spontaneous polarisation switching in the ytterbium fibre laser are explained by the competition of modes with orthogonal polarisations taking into account the polarisation-dependent saturation of amplification and losses. (fibre lasers)

Authors:
; ; ;  [1]
  1. M. V. Lomonosov Moscow State University, Faculty of Physics, Moscow (Russian Federation)
Publication Date:
OSTI Identifier:
21466651
Resource Type:
Journal Article
Resource Relation:
Journal Name: Quantum Electronics (Woodbury, N.Y.); Journal Volume: 37; Journal Issue: 4; Other Information: DOI: 10.1070/QE2007v037n04ABEH013374
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; DOPED MATERIALS; LASERS; OPTICAL FIBERS; POLARIZATION; PUMPING; SATURATION; SWITCHES; YTTERBIUM; ELECTRICAL EQUIPMENT; ELEMENTS; EQUIPMENT; FIBERS; MATERIALS; METALS; RARE EARTHS

Citation Formats

Voronin, V G, Sya, Ya V, Nanii, Oleg E, and Khlystov, V I. Mechanism of spontaneous switching of polarisation in an ytterbium-doped fibre laser. United States: N. p., 2007. Web. doi:10.1070/QE2007V037N04ABEH013374.
Voronin, V G, Sya, Ya V, Nanii, Oleg E, & Khlystov, V I. Mechanism of spontaneous switching of polarisation in an ytterbium-doped fibre laser. United States. doi:10.1070/QE2007V037N04ABEH013374.
Voronin, V G, Sya, Ya V, Nanii, Oleg E, and Khlystov, V I. Mon . "Mechanism of spontaneous switching of polarisation in an ytterbium-doped fibre laser". United States. doi:10.1070/QE2007V037N04ABEH013374.
@article{osti_21466651,
title = {Mechanism of spontaneous switching of polarisation in an ytterbium-doped fibre laser},
author = {Voronin, V G and Sya, Ya V and Nanii, Oleg E and Khlystov, V I},
abstractNote = {The regime of polarisation switching in a double-clad ytterbium fibre laser is studied experimentally and explained theoretically. It is shown that polarisation switching appears in lasers with the long active medium (no less than 20 m) when the pump slightly exceeds the threshold. The experimentally observed properties of spontaneous polarisation switching in the ytterbium fibre laser are explained by the competition of modes with orthogonal polarisations taking into account the polarisation-dependent saturation of amplification and losses. (fibre lasers)},
doi = {10.1070/QE2007V037N04ABEH013374},
journal = {Quantum Electronics (Woodbury, N.Y.)},
number = 4,
volume = 37,
place = {United States},
year = {Mon Apr 30 00:00:00 EDT 2007},
month = {Mon Apr 30 00:00:00 EDT 2007}
}
  • A single-polarisation, single-frequency, ytterbium-doped silica fibre laser has been demonstrated in a 2 cm linear cavity. The output power reaches 35 mW with an optical signal-to-noise ratio greater than 65 dB. A polarisation-maintaining fibre Bragg grating is used as the polarisation-dependent reflector to generate the single-polarisation output with the polarisation extinction ratio greater than 20 dB. The laser works stably for two hours under laboratory conditions.
  • Ytterbium-ion-doped double-clad optical fibres were developed. The differential quantum efficiency of a diode-pumped fibre laser, fabricated on the basis of such optical fibres with a fibre Bragg grating, was 90%. (lasers)
  • The use of optical fibres with a high concentration of active ions in the fibre core allows the reduction of the active fibre length and the increase in the threshold powers of various nonlinear effects in the fibre, thereby increasing the maximum output power of fibre lasers. For this purpose, we manufactured a highly concentrated ytterbium-doped ({approx}1.0x10{sup 21}cm{sup -3}) phosphate glass for the active fibre core and a pure glass of a similar composition for the fibre cladding. A single-mode fibre is fabricated from these glasses and generation is obtained in an ytterbium laser based on this fibre with themore » slope efficiency of no less than 60% at a wavelength of 975 nm. (letters)« less
  • An efficient cladding-pumped Yb-doped fibre laser with a Bragg grating written in a multimode graded-index fibre is fabricated for the first time. The laser emits one transverse mode with a slope efficiency of 60%. The resonator design proposed in the paper can be used for the development of high-power fibre lasers with an increased fibre core diameter. (lasers)
  • We have proposed and demonstrated a new passively Q-switched thulium-doped fibre laser configuration. A distinctive feature of this configuration is the use of a heavily holmium-doped fibre for Q-switching. Lasing was obtained at 1.96 μm, with a pulse energy of 3 μJ and pulse duration of 600 ns. The highest pulse repetition rate was 80 kHz. (control of laser radiation parameters)