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Highly efficient Ho:KY(WO4)2 thin-disk lasers at 2.06 µm
Author(s): Xavier Mateos; Pavel Loiko; Samir Lamrini; Karsten Scholle; Peter Fuhrberg; Soile Suomalainen; Antti Härkönen; Mircea Guina; Sergei Vatnik; Ivan Vedin; Magdalena Aguiló; Francesc Díaz; Yicheng Wang; Uwe Griebner; Valentin Petrov
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Paper 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.

Paper Details

Date Published: 16 May 2018
PDF: 8 pages
Proc. SPIE 10713, Pacific-Rim Laser Damage 2018: Optical Materials for High-Power Lasers, 107130J (16 May 2018); doi: 10.1117/12.2316822
Show Author Affiliations
Xavier Mateos, Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie (Germany)
Univ. Rovira i Virgili (Spain)
LISA Laser Products OHG (Germany)
Pavel Loiko, ITMO Univ. (Russian Federation)
Samir Lamrini, LISA Laser Products OHG (Germany)
Karsten Scholle, LISA Laser Products OHG (Germany)
Peter Fuhrberg, LISA Laser Products OHG (Germany)
Soile Suomalainen, Tampere Univ. of Technology (Finland)
Antti Härkönen, Tampere Univ. of Technology (Finland)
Mircea Guina, Tampere Univ. of Technology (Finland)
Sergei Vatnik, Institute of Laser Physics (Russian Federation)
Ivan Vedin, Institute of Laser Physics (Russian Federation)
Magdalena Aguiló, Univ. Rovira i Virgili (Spain)
Francesc Díaz, Univ. Rovira i Virgili (Spain)
Yicheng Wang, Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie (Germany)
Uwe Griebner, Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie (Germany)
Valentin Petrov, Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie (Germany)


Published in SPIE Proceedings Vol. 10713:
Pacific-Rim Laser Damage 2018: Optical Materials for High-Power Lasers
Takahisa Jitsuno; Jianda Shao; Wolfgang Rudolph, Editor(s)

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