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Optical refrigeration provides the only solid-state technology capable of reaching cryogenic temperatures, currently below 100K. Novel, adaptable designs are implemented for technologies requiring vibration-free cryogenic operation.
We report a milestone in optical refrigeration, cooling a 10% Yb:YLF crystal to 93K (ΔT∼180K); obtaining the coldest solid-state temperature to date. Identification of transition metal impurities via mass spectrometry allows further cooling through purification.
We report new records in optical refrigeration by cooling to 114K (ΔΤ>180Κ) as well as demonstrating a room-temperature heat lift of −750 mW in a 10% wt. Yb:YLF crystal at λ=1020ηιη.
A Yb:YLF crystal is laser cooled to 150 K from room temperature in an intracavity geometry using a high power InGaAs/GaAs MQW VECSEL operating at 1020 nm with <0.5 nm linewidth.
We measure the minimum achievable temperature (MAT) as a function of excitation wavelength in anti-Stokes fluorescence cooling of high purity Yb 3+ -doped LiYF 4 (Yb:YLF) crystal. Such measurements were obtained by developing a sensitive noncontact thermometry that is based on a two-band differential luminescence spectroscopy using balanced photo-detectors. These measurements are in...
A record low temperature in optical refrigeration is demonstrated by cooling Yb:YLF crystal to 128K ± 5K (∼-150 C) at λ=1020 nm corresponding to its E4-E5 Stark manifold resonance. The estimated cooling power is 165 mW.
Utilizing a novel implementation of differential luminescence thermometry we accurately measure laser cooling efficiency spectra of solids. Cooling to 110K is shown in Yb:YLF at the E4-E5 Stark manifold resonance as predicted by theory.
We demonstrate cooling of a 2 micron thick GaAs/InGaP double-heterostructure to 165 K by means of an optical refrigerator. Cooler is comprised of Yb3+-doped YLF crystal, pumped by 9 Watt near E4-E5 Stark manifold transition.
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