A phonon laser in ultra-cold matter
2010 (English)In: Europhysics letters, ISSN 0295-5075, E-ISSN 1286-4854, Vol. 91, no 3, 33001- p.Article in journal (Refereed) Published
We show the possible excitation of a phonon laser instability in an ultra-cold atomic gas confined in a magneto-optical trap. Such an effect results from a negative Landau damping of the collective density perturbations in the gas, leading to the coherent emission of phonons. This laser instability can be driven by a blue-detuned laser superimposed to the usual red-detuning laser beams which usually provide the cooling mechanism. Threshold conditions, instability growth rates and saturation levels are derived. This work generalizes, on theoretical grounds, the recent results obtained with a single-ion phonon laser, to an ultra-cold atomic gas, where real phonons can be excited. Future phonon lasers could thus adequately be called phasers.
Place, publisher, year, edition, pages
2010. Vol. 91, no 3, 33001- p.
IdentifiersURN: urn:nbn:se:umu:diva-38737DOI: 10.1209/0295-5075/91/33001ISI: 000282189800009OAI: oai:DiVA.org:umu-38737DiVA: diva2:381332
FunderSwedish Research Council