Condensed-phase optical refrigeration

Rayner, A.; Heckenberg, N. R.; Rubinsztein‐Dunlop, Halina

doi:10.1364/josab.20.001037

Cited by 37 publications

(22 citation statements)

References 52 publications

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“…The first demonstration of net laser cooling of a solid was accomplished in 1995 by Epstein and co-workers at Los Alamos National Laboratory using a highly pure ytterbium-doped fluorozirconate glass Yb 3+ :ZBLANP [9]. Since then, optical refrigeration has been confirmed in a variety of glasses and crystals doped with Yb 3+ (ZBLANP [9,[22][23][24][25], ZBLAN [26][27][28][29][30][31], ZBLANI [32], CNBZn [33,34], BIG [28,35,36], KGd(WO 4 ) 2 [37], KY(WO 4 ) 2 [37], YAG [37,38], Y 2 SiO 5 [38], KPb 2 Cl 5 [33,39], BaY 2 F 8 [40,41], YLF [42][43][44], ABCYS [45]), Tm 3+ (ZBLAN [46,47], BYF [48]), and Er 3+ (CNBZn [49], KPb 2 Cl 5 [49,50]). The inverse dependence of the cooling efficiency η c on the pump energy [Eq.…”

Section: Introductionmentioning

confidence: 99%

Cryogenic optical refrigeration

et al. 2012

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Doc. ID 157833)We review the field of laser cooling of solids, focusing our attention on the recent advances in cryogenic cooling of an ytterbium-doped fluoride crystal (Yb 3+ :YLiF 4 ). Recently, bulk cooling in this material to 155 K has been observed upon excitation near the lowest-energy (E4-E5) crystal-field resonance of Yb 3+ . Furthermore, local cooling in the same material to a minimum achievable temperature of 110 K has been measured, in agreement with the predictions of the laser cooling model. This value is limited only by the current material purity. Advanced material synthesis approaches reviewed here would allow reaching temperatures approaching 80 K. Current results and projected improvements position optical refrigeration as the only viable all-solid-state cooling approach for cryogenic temperatures.

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Section: Introductionmentioning

confidence: 99%

Cryogenic optical refrigeration

et al. 2012

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“…[13]. Thus, a bathochromic excitation can result in more hypsochromic fluorescence as an average; losses should be low because of the strong solid-state fluorescence.…”

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confidence: 99%

“…Since the additional energy for such a process must be taken from the surroundings, the dye can be used, in principle, for cooling with light; for a review concerning the process of cooling with the use of anti-Stokes emission see ref. [13]. The entropy thus required is taken from the spread of the oriented radiation into diffuse radiation of the fluorescence light.…”

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confidence: 99%

A Novel Fluorescent Dye with Strong, Anisotropic Solid‐State Fluorescence, Small Stokes Shift, and High Photostability

Langhals¹,

Krotz²,

Polborn

et al. 2005

Angew Chem Int Ed

153

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“…Its final expression is extremely similar to the one defined in Anti-Stokes cooling experiments: 12,13 P cool = a(ν)P opt…”

Section: Thermal Deflection Spectroscopy Cooling Measurementsmentioning

confidence: 59%

A Kennard-Stepanov relation study on redistributional laser cooling in dense gaseous ensembles

et al. 2015

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We report on experiments investigating laser cooling of atomic gases by collisional redistribution of radiation, a technique applicable to dense mixtures of alkali metals with noble gases. Thermal deflection spectroscopy is one of the methods used to measure the temperature change of the laser-cooled gas. In this work we describe experiments focusing on a different technique for precise determination of the local temperature achieved by the cooling within the gas cell. We investigate the Kennard-Stepanov relation, a thermodynamic, Boltzmann-type scaling between the absorption and emission spectral profiles of an absorber, which applies in many liquid state dye solutions as well as in semiconductor systems. To this end, absorption and emission spectra of rubidium atoms and dimers in dense argon buffer gas environment have been recorded. We demonstrate experimentally that the Kennard-Stepanov relation between absorption and emission spectra is well fulfilled for the collisionally broadened atomic and molecular transitions of the system, which allows for the extraction of the thermodynamic temperature.

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Condensed-phase optical refrigeration

Cited by 37 publications

References 52 publications

Cryogenic optical refrigeration

Cryogenic optical refrigeration

A Novel Fluorescent Dye with Strong, Anisotropic Solid‐State Fluorescence, Small Stokes Shift, and High Photostability

A Kennard-Stepanov relation study on redistributional laser cooling in dense gaseous ensembles

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