Infrared-to-green up-conversion in Er3+, Yb3+-doped monoclinic KGd(WO4)2 single crystals |
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| Affiliation: | 1. School of Physical Science & Engineering and Key Laboratory of Materials Physics of Ministry of Education of China, Zhengzhou University, Zhengzhou 450052, China;2. North China University of Water Resources and Electric Power, 450011, China;1. Institute of Advanced Materials, Nanjing University of Technology, 5 Xinmofanma Road, Nanjing 210009, China;2. Faculty of Engineering, Kyoto Sangyo University, Kita-ku, Kyoto 603-8555, Japan;3. Institute of Physics, Faculty of Mechanical Engineering and Mechatronics, Westpomeranian University of Technology in Szczecin, Al. Piastów 17, 70-310 Szczecin, Poland;1. The Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan;2. National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8562, Japan;3. Sophia University, 7-1 Kioi-cho, Chiyoda-ku, Tokyo 102-8554, Japan;1. 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;2. Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, 2A Max-Born-Str., Berlin D-12489, Germany;3. ITMO University, 49 Kronverkskiy pr., St. Petersburg 197101, Russia;4. Center for Optical Materials and Technologies (COMT), Belarusian National Technical University, 65/17 Nezavisimosti Ave., Minsk 220013, Belarus |
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| Abstract: | Optical spectroscopy of the green emission of erbium in KGd(WO4)2 (KGW) single crystals codoped with ytterbium ions is investigated. To do this, we firstly grew good-optical-quality KGW single crystals doped with Er3+ and Yb3+ at several dopant concentrations by the Top-seeded-solution-growth slow-cooling method (TSSG). Green photoluminescence of Er3+ in KGW host was studied at room temperature (RT) and low temperature (10 K) by means of Yb3+ sensitization after infrared excitation at 981 nm (10194 cm?1). We calculated the emission and gain cross-sections and compared these with those of other known Er3+-doped laser materials like LiYF4 :Er (YLF:Er) and Y3Al5O12:Er (YAG:Er) at RT. Our study also focused on determining the optimal concentration of ions for generating the most intense green emission. We measured the lifetime of the green emission after infrared pump at several Yb3+ concentrations. From the low-temperature emission experiments, we determined the energy position of the sublevels of the ground state of erbium. |
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