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We measure the minimum achievable temperature (MAT) as a function ofexcitation wavelength in anti-Stokes fluorescence cooling of high purityYb3+-doped LiYF4 (Yb:YLF) crystal. Such measurements were obtained bydeveloping a sensitive noncontact thermometry that is based on a two-banddifferential luminescence spectroscopy using balanced photo-detectors. Thesemeasurements are in excellent agreement with the prediction of the lasercooling model and identify MAT of 110 K at 1020 nm, corresponding to E4-E5Stark manifold transition in Yb:YLF crystal.

Precise Determination of Minimum Achievable Temperature for Solid-State Optical Refrigeration