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1 March 2019 Progress towards optical cryocooling in Mid-IR
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Abstract
Detailed characterization of Tm- and Ho-doped crystals is performed to identify optimum operation parameters for reaching cryogenic temperatures. The energy-gap scaling law states that these materials can deliver double the cooling efficiency compared with the Yb-doped systems. Here, we show our recent measurements of external quantum efficiency 𝜂ext and background absorption 𝛼b in Ho- and Tm-doped YLF and BYF crystals. Together with temperature-dependent spectroscopy, these data are then used to determine the minimum achievable temperature and the optimum cooling wavelengths for each crystal. Finally, the potential of these crystals for implementing mid-IR radiation balanced lasers is discussed.
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© (2019) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Saeid Rostami, Azzurra Volpi, Alexander R. Albrecht, and Mansoor Sheik-Bahae "Progress towards optical cryocooling in Mid-IR", Proc. SPIE 10936, Photonic Heat Engines: Science and Applications, 109360H (1 March 2019); https://doi.org/10.1117/12.2509017
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