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Abstract: We present a new theoretical scheme for laser cooling of rare earth dopedsolids with optical super-radiance SR, which is the coherent, sharplydirected spontaneous emission of photons by a system of laser excited rareearth ions in the solid state host glass or crystal. We consider an Yb3+doped ZBLAN sample pumped at the wavelength 1015 nm with a rectangular pulsedsource with a power of ~433W and duration of 10ns. The intensity of the SR isproportional to the square of the number of excited ions. This unique featureof SR permits a dramatic increase in the rate of the cooling process incomparison with the traditional laser cooling of the rare earth doped solidswith anti-Stokes spontaneous incoherent radiation fluorescence. This schemeovercomes the limitation of using only low phonon energy hosts for lasercooling.



Author: Galina Nemova, Raman Kashyap

Source: https://arxiv.org/







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