14 March 2018Investigation of temperature dependence of quantum efficiency and parasitic absorption in rare-earth doped crystals (Conference Presentation)
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Optical refrigeration of rare-earth doped crystals has exceptional qualities that can be used for building a compact and vibration-free all-solid-state optical cooler. Estimating the lowest achievable temperature and cooling power of such a device requires accurate measurements of external quantum efficiency, mean fluorescence wavelength, and parasitic absorption. Here we discuss temperature dependent measurements of these parameters for a high quality Yb:YLF sample by performing a LITMoS test (Laser Induced Temperature Modulation Spectrum) combined with contact-free differential luminescence thermometry. These measurements are challenging at low temperatures, but by integrating these two methods, we can perform LITMoS test at any temperature.
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Aram Gragossian, Azzurra Volpi, Junwei Meng, Alexander R. Albrecht, Saeid Rostami, Markus P. Hehlen, Mansoor Sheik-Bahae, "Investigation of temperature dependence of quantum efficiency and parasitic absorption in rare-earth doped crystals (Conference Presentation)," Proc. SPIE 10550, Optical and Electronic Cooling of Solids III, 1055006 (14 March 2018); https://doi.org/10.1117/12.2292265