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5 March 2021 Observation of optical refrigeration in Ho:BYF crystal
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The first demonstration of optical refrigeration in 1% Ho:BYF crystal with near unity external quantum efficiency (ɳ_{ext}~99.7%) is reported. Laser cooling efficiency, ɳ_{ext}, and background absorption (α_b) of 1% Ho:BYF crystal is obtained from laser induced temperature modulation spectroscopy (LITMoS) test, and its minimum achievable temperature (MAT) and optimum laser cooling wavelengths are extracted via temperature-dependent spectroscopic analysis. MAT of 120 K at the optimum laser cooling wavelengths of 2056 nm or 2063 nm is estimated for 1% Ho:BYF crystal with measured ɳ_{ext}=99.7% and α_b~1e-3 cm^-1. Additionally, MATs of 80 K and sub-80 K are estimated for this crystal considering improved background absorptions of α_b~2e-4 cm^-1 and α_b~5e-5 cm^-1 respectively.
Conference Presentation
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Saeid Rostami and Mansoor Sheik-Bahae "Observation of optical refrigeration in Ho:BYF crystal", Proc. SPIE 11702, Photonic Heat Engines: Science and Applications III, 1170205 (5 March 2021);

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