Super-radiance and fluorescence are two approaches to laser cooling of solids

Galina Nemova; Raman Kashyap

doi:10.1117/12.905627

31 August 2011 Super-radiance and fluorescence are two approaches to laser cooling of solids

Galina Nemova, Raman Kashyap

Proceedings Volume 8007, Photonics North 2011; 80070I (2011) https://doi.org/10.1117/12.905627
Event: Photonics North 2011, 2011, Ottawa, Canada

Abstract

A new approach to cool solids with super-radiance (SR) pulses is presented in comparison with laser cooling based on traditional anti-Stokes fluorescence. Contrary to the anti-Stokes fluorescence, which is in-coherent radiation propagating in all directions around a sample, SR is the coherent, sharply directed spontaneous emission of photons by a system of excited ions. We consider an Yb³⁺ doped ZBLAN sample pumped at the wavelength 1015nm with a rectangular pulsed source. 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 fluorescence. This scheme overcomes the limitation of using only low phonon energy glasses for laser cooling.

Citation Download Citation

Galina Nemova and Raman Kashyap "Super-radiance and fluorescence are two approaches to laser cooling of solids", Proc. SPIE 8007, Photonics North 2011, 80070I (31 August 2011); https://doi.org/10.1117/12.905627

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