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Cooling with Anti-stokes fluorescence

An optical, spectral band technique for cooling with anti-Stokes fluorescence

Active Publication Date: 2019-04-02
SOLCOLD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this regard, anti-Stokes-based cooling methods have not yet been applied under the conditions of temperature and non-monochromatic radiation
This shortcoming further limits the use of the anti-Stokes effect in relatively small-scale applications

Method used

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  • Cooling with Anti-stokes fluorescence

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Embodiment Construction

[0106] As mentioned above, Fig. 1(a) (reproduced from Nemova G., Laser Cooling of Solids, page 4, Figure 1(a) to Figure 1(b) ) shows a 4-level model for optical cooling of RE-doped glasses such as Yb 3+ : ZBLANP. Although the figure originally deals with laser cooling, it is equally relevant for broadband radiation. Specific calculations for the Level 4 model are shown in Fig. 1(b) (units are cm -1 ).

[0107] Optical cooling in semiconductors in figure 2 is schematically illustrated in , and has been discussed earlier in this application. Upconverting excitation photons resulting from thermal equilibrium between adjacent excitation levels results in the emission of photons with higher energies than the absorbed photons. Thus, the optical cooling effect in semiconductor materials is achieved through phonon absorption and conversion of thermal energy to electromagnetic energy.

[0108] image 3 (Reproduced from Jun Zhang, Dehui Li, Renjie Chen, Qihua Xiong, Laser Cooli...

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Abstract

A double or multi- layer apparatus or device for optical anti-Stokes cooling of object surfaces. The apparatus comprises at least one bottom layer, which is configured to respond in anti-Stokes fluorescence upon absorption of electromagnetic radiation and at least one top layer, which is overlaid on the bottom layer and configured to filter the electromagnetic radiation and transmit selected spectral band of the electromagnetic radiation to the bottom layer. The active cooling does not depend on the coherent nature of the radiation, which enables the usage of incoherent solar radiation as theactive cooling input power source. The cooling technology of the invention is suitable for small and large scales and practically for any object with surface on which the layer substance can be applied or overlaid, e.g., roof, wall, car, ship, tent, clothing, etc.

Description

technical field [0001] The present invention relates to cooling using anti-Stokes fluorescence. More specifically, the present invention relates to cooling techniques using absorption of incoherent non-monochromatic electromagnetic / solar radiation and anti-Stokes fluorescence. Background technique [0002] Laser cooling of solids is a phenomenon in which interaction with radiation results in efficient cooling in solid materials. This idea was proposed by Pringsheim as early as 1929. It was not until 1995 that Epstein et al. achieved laser cooling of solids, and they managed to cool solids down to 0.3K (Epstein 1995), also known as optical cooling of solids. This is a rapidly developing field where the state of the art is the cooling of solids to cryogenic temperatures down to 100K (Melgaard 2016). In the solid phase of matter, much of the thermal energy of the matter is contained in the vibrational modes of the lattice. Therefore, the reduction in vibratory motion of the...

Claims

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Application Information

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IPC IPC(8): F25D31/00G02F1/35
CPCF25D31/00F25D2400/26F25B23/003
Inventor Y·申哈夫G·格罗塔斯
Owner SOLCOLD
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