Breaking the low phonon energy barrier for laser cooling in rare-earth doped hosts

Galina Nemova; Raman Kashyap

doi:10.1117/12.874066

8 February 2011 Breaking the low phonon energy barrier for laser cooling in rare-earth doped hosts

Galina Nemova, Raman Kashyap

Proceedings Volume 7951, Laser Refrigeration of Solids IV; 79510G (2011) https://doi.org/10.1117/12.874066
Event: SPIE OPTO, 2011, San Francisco, California, United States

Abstract

A new approach to cool rare earth doped solids with optical super-radiance (SR) is presented. SR is the coherent, sharply directed spontaneous emission of photons by a system excited with a pulsed laser. We consider an Yb3+ doped ZBLAN sample pumped at the wavelength 1015nm with a rectangular pulsed source with a power of ~700W and duration of 20ns. The intensity of the SR is proportional to the square of the number of excited ions. This unique feature of SR permits an increase in the rate of the cooling process in comparison with the traditional laser cooling of the rare earth doped solids with anti-Stokes spontaneous incoherent radiation (fluorescence). This scheme overcomes the limitation of using only low phonon energy glasses for laser cooling.

Citation Download Citation

Galina Nemova and Raman Kashyap "Breaking the low phonon energy barrier for laser cooling in rare-earth doped hosts", Proc. SPIE 7951, Laser Refrigeration of Solids IV, 79510G (8 February 2011); https://doi.org/10.1117/12.874066

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