Spectroscopic and laser characterization of Yb,Tm:KLu(WO4)2 crystal |
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| Affiliation: | 1. Center for Optical Materials and Technologies, Belarusian National Technical University, 65/17 Nezavisimosti Ave., 220013 Minsk, Belarus;2. Física i Cristal·lografia de Materials i Nanomaterials (FiCMA-FiCNA), Universitat Rovira i Virgili (URV), Campus Sescelades, c/Marcel·lí Domingo, s/n., E-43007 Tarragona, Spain;3. Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, 2A Max-Born-Str., D-12489 Berlin, Germany;1. Key Laboratory of Photonic and Electric Bandgap Materials, Ministry of Education, School of Physics and Electronic Engineering, Harbin Normal University, Harbin 150025, China;2. College of Information Science and Engineering, Northeastern University, Shenyang 110819, China;1. National Institute of Lasers and Optronics (NILOP), P.O. Nilore, Islamabad, Pakistan;2. Pakistan Institute of Engineering and Applied Sciences (PIEAS), P.O. Nilore, Islamabad, Pakistan;1. College of Science, Shaanxi University of Science and Technology, Xi''an 710021, China;2. College of Electrical and Information Engineering, Shaanxi University of Science and Technology, Xi''an 710021, China;3. School of Materials Science and Engineering, Shaanxi University of Science and Technology, Xi''an 710021, China;1. Oral and Maxillofacial Surgery Unit, Plastic and Maxillofacial Surgery Department, Hospital Clínic (Barcelona University), C/ Villarroel, 170, 08036, Barcelona, Spain;2. Nuclear Medicine Department, Hospital Clínic-Institut d''Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), C/ Villarroel, 170, 08036, Barcelona, Spain;3. Nuclear Medicine Department, Hospital Clínic (Barcelona University), C/ Villarroel, 170, 08036, Barcelona, Spain;1. Center for Optical Materials and Technologies (COMT), Belarusian National Technical University, 65/17 Nezavisimosti Ave., Minsk 220013, Belarus;2. Física i Cristal·lografia de Materials i Nanomaterials (FiCMA-FiCNA), Universitat Rovira i Virgili (URV), Campus Sescelades, c/ Marcel·lí Domingo, s/n., Tarragona E-43007, Spain;3. B.I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, 68 Nezavisimosti Ave., Minsk 220072, Belarus;4. Institute of Laser Physics, Siberian Branch of Russian Academy of Sciences, 13/3 Lavrentyev Ave., Novosibirsk 630090, Russia;5. A.V. Nikolaev Institute of Inorganic Chemistry, Siberian Branch of Russian Academy of Sciences, 3 Lavrentyev Ave., Novosibirsk 630090, Russia;1. Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan, 430074, China;2. College of Science, Jiujiang University, Jiujiang, 332005, China |
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| Abstract: | We report on a comprehensive spectroscopic and laser characterization of monoclinic Yb,Tm:KLu(WO4)2 crystals. Stimulated-emission cross-section spectra corresponding to the 3F4 → 3H6 transition of Tm3+ ions are determined. The radiative lifetime of the 3F4 state of Tm3+ ions is 0.82 ms. The maximum Yb3+ → Tm3+ energy transfer efficiency is 83.9% for 5 at.% Yb – 8 at.% Tm doping. The fractional heat loading for Yb,Tm:KLu(WO4)2 is 0.45 ± 0.05. Using a hemispherical cavity and 5 at.% Yb – 6 at.% Tm doped crystal, a maximum CW power of 227 mW is achieved at 1.983–2.011 μm with a maximum slope efficiency η = 14%. In the microchip laser set-up, the highest slope efficiency is 20% for a 5 at.% Yb– 8 at.% Tm doped crystal with a maximum output power of 201 mW at 1.99–2.007 μm. Operation of Yb,Tm:KLu(WO4)2 as a vibronic laser emitting at 2.081–2.093 μm is also demonstrated. |
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| Keywords: | Double tungstates Holmium Ytterbium Energy transfer Laser operation |
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