积分球内漫散射光对铷87原子冷却的装载过程研究

Abstract

Cold 87 Rb atom's loading in an integrating sphere with diffuse light is analyzed theoretically and experimentally. The experimental results show that diffuse light cooling has the greatest efficiency to cool the most atoms when the red detuning between the frequencies of cooling light and atom transition is about 3.3Γ (Γ is the natural linewidth, 6.065 MHz). Theoretical analysis using rate equation and numerical calculations on the cold atom number and loading time agree with the experimental results. This integrating sphere cooling would be a novel method for cooling atoms and lead to a new and robust cold atom source for atomic clock.OCIS codes: 020.0020, 260.0260.

Optical binding with cold atoms

“…We have verified that the oscillations of an atom in the optical potential of another atom kept at a fixed position also results in an increase (decrease) of kinetic energy for positive (negative) detuning. These results of mutual heating or cooling is thus reminiscent of the asymmetry reported in multiplescattering based atom cooling schemes [25][26][27], but differs from previous works on optical binding of dielectric spheres, which did not study the sign of the particles refractive index [14]. We have performed a systematic study of the free to bound states transition and identified the following scaling law for the critical initial temperature T c of this transition:…”

“…We stress that the damping observed in the bound state region cannot be associated to a viscous medium as in [6,7]. In our case, the cooling of the relative motion for negative detunging can be understood as Doppler cooling in a multiply scattering regime [25][26][27].…”

Cooperative cooling in a one-dimensional chain of optically bound cold atoms

“…4(c)]. The present situation is at odds from the cooling by diffuse light reported for atoms trapped in a reflecting cylinder [28][29][30], where the cooling was achieved in a fully disordered system, and was optimal off resonance ( ≈ −3 ).…”