Photons in the Ultra-cold Gas
In this chapter, we discuss the properties of laser beam propagation in the ultra-cold gas, by focusing mainly our attention on the specific properties of this medium. We first consider the linear and nonlinear dispersion properties of light. The novelty here is that the laser beams used for atom cooling can couple to the low frequency oscillations of the atomic cloud. In particular they can destabilize the hybrid sound inside the gas, therefore generating small scale oscillations, which can be the seed for turbulence in the medium. Under certain conditions, the laser beam can become modulationaly unstable, and photon bubbles can eventually be formed.
KeywordsDispersion Relation Test Particle Atom Density Density Perturbation Scattered Field
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