scholarly journals LiNbO3-Tm3+ Crystal. Material for Optical Cooling

Crystals ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 50
Author(s):  
Ninel Kokanyan ◽  
Nune Mkhitaryan ◽  
Gagik Demirkhanyan ◽  
Ajith Kumar ◽  
Michel Aillerie ◽  
...  
Keyword(s):  
Wavelength Range ◽  
Pump Intensity ◽  
Final Temperature ◽  
Crystal Material ◽  
Optical Cooling ◽  
Concentration Dependences ◽  
Anti Stokes

The possibilities of LiNbO3-Tm3+ crystals for optical cooling based on anti-Stokes luminescence in the wavelength range of 1818–2200 nm are investigated. The concentration dependences of the final temperature of the crystal have been determined under continuous (CW) excitation at wavelengths of 1822–1977 nm with a pump intensity Fp=5×1021 cm−2s−1. It was shown that significant cooling with ∆T = 22 K, 19 K, and 16.4 K can be achieved, respectively, with excitation at wavelengths 1977, 1967, and 1948 nm.

Development of an organic dye solution for laser cooling by anti-Stokes fluorescence

2001 ◽  
Vol 667 ◽  
Author(s):  
Jarett L. Bartholomew ◽  
Peter A. DeBarber ◽  
Bauke Heeg ◽  
Garry Rumbles
Keyword(s):  
Laser Cooling ◽  
Organic Dye ◽  
Quantum Yields ◽  
Long Wavelength ◽  
Fluorescence Quantum Yields ◽  
Optical Cooling ◽  
Doped Glasses ◽  
Anti Stokes ◽  
Rhodamine 101 ◽  
Dye Solutions

ABSTRACTSeveral independent groups have observed optical cooling by means of anti-Stokes luminescence in condensed media. The most promising materials are grouped into two categories: ion-doped glasses and organic dye solutions. It is this latter group that we focus our efforts on. Recent studies by our group show that irradiating a solution of rhodamine 101 in the long wavelength wing of the absorption spectrum results in the observation of optical cooling. To improve upon the initial observation of a few degree drop in temperature requires a better understanding of the conditions and phenomena leading to anti-Stokes luminescence in dye solutions. We develop a thermal lensing experiment to obtain fluorescence quantum yields of various dye solutions. The importance of concentration, choice of solvent, deuteration, and acidification are discussed.

Principle of Optical Cooling by Exciton-Polariton anti-Stokes Scattering

2015 ◽  
Author(s):  
Maxime Richard ◽  
Sebastian Klembt ◽  
Emilien Durupt ◽  
Thorsten Klein ◽  
Augustin Baas ◽  
...  
Keyword(s):  
Optical Cooling ◽  
Anti Stokes

Investigation of sensitized anti-stokes phosphors using sinusoidal modulation of the pump intensity

1974 ◽  
Vol 9 (4) ◽  
pp. 267-287 ◽  
Author(s):  
J.J. Davies ◽  
G.F.J. Garlick ◽  
C.L. Richards ◽  
G. Sowersby
Keyword(s):  
Pump Intensity ◽  
Sinusoidal Modulation ◽  
Anti Stokes

Anti-Stokes photoluminescence and optical cooling of CdSeS/ZnS colloidal quantum dots embedded in dielectric waveguides

2020 ◽  
Author(s):  
Mark V. Reymatias ◽  
Gema J. Alas ◽  
Arjun Senthil ◽  
Sami A. Nazib ◽  
Troy A. Hutchins-Delgado ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Colloidal Quantum Dots ◽  
Dielectric Waveguides ◽  
Optical Cooling ◽  
Anti Stokes

Color tunability with temperature and pump intensity in Yb3+/Tm3+ codoped aluminosilicate glass under anti-Stokes excitation

2010 ◽  
Vol 133 (3) ◽  
pp. 034507 ◽  
Author(s):  
W. F. Silva ◽  
G. S. N. Eliel ◽  
P. V. dos Santos ◽  
M. T. de Araujo ◽  
M. V. D. Vermelho ◽  
...  
Keyword(s):  
Pump Intensity ◽  
Aluminosilicate Glass ◽  
Color Tunability ◽  
Anti Stokes

Application of pyrometer and standard sample to determine surface temperature of studied materials

2019 ◽  
pp. 9-13
Author(s):  
V.Ya. Mendeleyev ◽  
V.A. Petrov ◽  
A.V. Yashin ◽  
A.I. Vangonen ◽  
O.K. Taganov
Keyword(s):  
Composite Material ◽  
Surface Temperature ◽  
Relative Error ◽  
Wavelength Range ◽  
Standard Sample ◽  
A Priori ◽  
Temperature Changes ◽  
Surface Temperatures ◽  
Relative Errors ◽  
Normal Emissivity

Determining the surface temperature of materials with unknown emissivity is studied. A method for determining the surface temperature using a standard sample of average spectral normal emissivity in the wavelength range of 1,65–1,80 μm and an industrially produced Metis M322 pyrometer operating in the same wavelength range. The surface temperature of studied samples of the composite material and platinum was determined experimentally from the temperature of a standard sample located on the studied surfaces. The relative error in determining the surface temperature of the studied materials, introduced by the proposed method, was calculated taking into account the temperatures of the platinum and the composite material, determined from the temperature of the standard sample located on the studied surfaces, and from the temperature of the studied surfaces in the absence of the standard sample. The relative errors thus obtained did not exceed 1,7 % for the composite material and 0,5% for the platinum at surface temperatures of about 973 K. It was also found that: the inaccuracy of a priori data on the emissivity of the standard sample in the range (–0,01; 0,01) relative to the average emissivity increases the relative error in determining the temperature of the composite material by 0,68 %, and the installation of a standard sample on the studied materials leads to temperature changes on the periphery of the surface not exceeding 0,47 % for composite material and 0,05 % for platinum.

Results of Spatial Structure of Atmosphere Radiation in a Spectral Range (1.5–2) µm Research

2018 ◽  
pp. 7-13
Author(s):  
Anton M. Mishchenko ◽  
Sergei S. Rachkovsky ◽  
Vladimir A. Smolin ◽  
Igor V . Yakimenko
Keyword(s):  
Spatial Structure ◽  
Unmanned Aerial Vehicle ◽  
Wavelength Range ◽  
Spectral Range ◽  
Near Ir ◽  
Optoelectronic Systems ◽  
Aerial Vehicle

Results of experimental studying radiation spatial structure of atmosphere background nonuniformities and of an unmanned aerial vehicle being the detection object are presented. The question on a possibility of its detection using optoelectronic systems against the background of a cloudy field in the near IR wavelength range is also considered.

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