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16 May 2018 Highly-efficient Ho:KY(WO4)2 thin-disk lasers at 2.06 μm
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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Proceedings Volume 10713, Pacific-Rim Laser Damage 2018: Optical Materials for High-Power Lasers; 107130J (2018) https://doi.org/10.1117/12.2316822
Event: Pacific Rim Laser Damage 2018: Optical Materials for High Power Lasers, 2018, Yokohama, Japan
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.
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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, and Valentin Petrov "Highly-efficient Ho:KY(WO4)2 thin-disk lasers at 2.06 μm", Proc. SPIE 10713, Pacific-Rim Laser Damage 2018: Optical Materials for High-Power Lasers, 107130J (16 May 2018); https://doi.org/10.1117/12.2316822
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KEYWORDS
Holmium
Continuous wave operation
Absorption
Doping
Pulsed laser operation
Spectroscopy
Laser damage threshold
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