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We report the complete characterization of various cooling grade Tm-dopedcrystals including the first demonstration of optical refrigeration in Tm:YLFcrystals. Room temperature laser cooling efficiencies of 1% and 2% (mol)Tm:YLF, and 1% Tm:BYF crystals at different excitation polarizations aremeasured and their external quantum efficiency and background absorption areextracted. By performing detailed low-temperature spectroscopic analysis of thesamples, global minimum achievable temperatures of 160 K to 110 K areestimated. The potential of Tm-doped crystals to realize mid-IR opticalcryocoolers and radiation balanced lasers (RBLs) in the eye-safe region of thespectrum is discussed, and a promising 2-tone RBL in a tandem structure ofTm:YLF and Ho:YLF crystals is proposed.

Tm-doped Crystals for mid-IR Optical Cryocoolers and Radiation Balanced Lasers