| Autor: |
Mircea Guina, Francesc Díaz, Yicheng Wang, Soile Suomalainen, I. A. Vedin, Antti Härkönen, Karsten Scholle, Uwe Griebner, Magdalena Aguiló, Valentin Petrov, Pavel Loiko, Samir Lamrini, Peter Fuhrberg, Sergei Vatnik, Xavier Mateos |
| Rok vydání: |
2018 |
| Předmět: |
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| Zdroj: |
Pacific-Rim Laser Damage 2018: Optical Materials for High-Power Lasers. |
| Popis: |
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. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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