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Highly-efficient Ho:KY(WO4)2 thin-disk lasers at 2.06 μm

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Details

Original languageEnglish
Title of host publicationPacific-Rim Laser Damage 2018
Subtitle of host publicationOptical Materials for High-Power Lasers
PublisherSPIE, IEEE
ISBN (Electronic)9781510619920
DOIs
Publication statusPublished - 2018
Publication typeA4 Article in a conference publication
EventPacific-Rim Laser Damage - Yokohama, Japan
Duration: 24 Apr 201827 Apr 2018

Publication series

NameProceedings of SPIE
Volume10713
ISSN (Print)0277-786X

Conference

ConferencePacific-Rim Laser Damage
CountryJapan
CityYokohama
Period24/04/1827/04/18

Abstract

The recent advances in the development of Holmium monoclinic double tungstate thin-disk lasers are reviewed. The thin-disk is based on a 250-μm-thick 3 at. % Ho:KY(WO4)2 active layer grown on a (010)-oriented KY(WO4)2 substrate. When pumped by a Tm-fiber laser at 1960 nm with a single-bounce pump geometry, the continuous-wave Ho:KY(WO4)2 thin-disk laser generates an output power of 1.01 W at 2057 nm corresponding to a slope efficiency η of 60% and a laser threshold of only 0.15 W. The thin-disk laser is passively Q-switched with a GaSb-based quantum-well semiconductor saturable absorber mirror. In this regime, it generates an average output power of 0.551 W at ∼2056 nm with η = 44%. The best pulse characteristics are 4.1 μJ/201 ns at a repetition rate of 135 kHz. The laser performance, beam quality and thermo-optic aberrations of such lasers are strongly affected by the Ho3+ doping concentration. For the 3 at.% Ho3+-doped thin-disk, the thermal lens is negative (the sensitivity factors for the two principal meridional planes are-1.7 and-0.6 m-1/W) and astigmatic. The Ho:KY(WO4)2 epitaxial structures are promising as active elements in mode-locked thin-disk lasers at ∼2060 nm.

Keywords

  • 2-micron lasers, Ho-lasers, monoclinic double tungstates, Q-switched lasers, thin-disk lasers

Publication forum classification

Field of science, Statistics Finland