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Tytuł pozycji:

Model of laser-induced temperature changes in solid-state optical refrigerators.

Tytuł :
Model of laser-induced temperature changes in solid-state optical refrigerators.
Autorzy :
Patterson, W. M.
Sheik-Bahae, M.
Epstein, R. I.
Hehlen, M. P.
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Temat :
PHYSICS research
TEMPERATURE
SOLID state electronics
REFRIGERATORS
LUMINESCENCE
SEMICONDUCTOR doping
Źródło :
Journal of Applied Physics; Mar2010, Vol. 107 Issue 6, p063108-063117, 9p, 4 Diagrams, 2 Charts, 6 Graphs
Czasopismo naukowe
We present an efficient and numerically stable method to calculate time-dependent, laser-induced temperature distributions in solids and provide a detailed description of the computational procedure and its implementation. This study combines the two-dimensional heat equation with laser-induced heat generation and temperature-dependent luminescence. The time-dependent optical response of a system is obtained numerically by the Crank–Nicolson method. This general model is applied to the specific case of optical refrigeration in ytterbium (Yb3+) doped fluorozirconate glass (ZBLAN). The laser-induced temperature change upon optical pumping and the respective transient luminescence response are calculated and compared to experimental data. The model successfully predicts the zero-crossing temperature, the net quantum efficiency, and the functional shape of the transients. We find that the laser-cooling transients have a fast and a slow component that are determined by the excited-state lifetime of the luminescent ion and the thermal properties of the bulk, respectively. The tools presented here may find application in the design of a wide range of optical and optoelectronic devices. [ABSTRACT FROM AUTHOR]
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