Diffusion cooling of atoms

In this paper we describe an experiment of efficient cooling of $^{87}$ Rb atoms in two-frequency diffuse laser lights. Compared with single frequency diffuse light, two-frequency diffuse lights have wider velocity capture range and thus can cool more atoms. In our experiment, the maximum number of cooled atoms can reach up to $3.9\times10^9$ . Such a result is quite useful in building a compact cold atom clock.In this paper we describe an experiment of efficient cooling of $^{87}$Rb atoms in two-frequency diffuse laser lights. Compared with single frequency diffuse light, two-frequency diffuse lights have wider velocity capture range and thus can cool more atoms. In our experiment, the maximum number of cooled atoms can reach up to $3.9\times10^9$. Such a result is quite useful in building a compact cold atom clock.

arXiv:0901.1707Jan 13, 20090 citations

Trapping and Cooling of Atoms

Roberto Onofrio, Luca Salasnich

Lecture notes in physicsJan 1, 20240 citations

Diffuse laser cooling based on the 6 P 3 / 2 excited state of rubidium atoms via 420 nm blue light

Jia Zhang, Xun Gao, Zheng Xiao +5 more

To date, the laser cooling of rubidium atoms has inevitably relied on 780 nm cooling light corresponding to the first excited state 5 P 3 / 2 . Here, we demonstrate diffuse laser cooling of Rb 87 atoms using the 420 nm 5 S 1 / 2 → 6 P 3 / 2 transition without a preceding 780 nm cooling stage. A high-power 420 nm laser is used as the cooling light to produce cold atoms in a 1-m-long diffuse-cooling cell. Absorption spectroscopy yields a cold-atom density of approximately 1.4 × 10 11 m − 3 . We compare the cooling performance of the 420 nm and conventional 780 nm diffuse-cooling schemes and verify the feasibility of using the high-excited-state transition as an independent cooling channel in this large-volume diffuse-cooling system. This approach provides an alternative cooling/pumping pathway for continuous cold-atom active optical clocks, where compatibility with the clock-lasing process and reduced cooling-light-induced perturbations are important. It is also expected to open up research directions and application prospects in frontier fields such as Rydberg atoms, quantum information, and so on.To date, the laser cooling of rubidium atoms has inevitably relied on 780 nm cooling light corresponding to the first excited state 5 P 3 / 2 . Here, we demonstrate diffuse laser cooling of Rb 87 atoms using the 420 nm 5 S 1 / 2 → 6 P 3 / 2 transition without a preceding 780 nm cooling stage. A high-power 420 nm laser is used as the cooling light to produce cold atoms in a 1-m-long diffuse-cooling cell. Absorption spectroscopy yields a cold-atom density of approximately 1.4 × 10 11 m − 3 . We compare the cooling performance of the 420 nm and conventional 780 nm diffuse-cooling schemes and verify the feasibility of using the high-excited-state transition as an independent cooling channel in this large-volume diffuse-cooling system. This approach provides an alternative cooling/pumping pathway for continuous cold-atom active optical clocks, where compatibility with the clock-lasing process and reduced cooling-light-induced perturbations are important. It is also expected to open up research directions and application prospects in frontier fields such as Rydberg atoms, quantum information, and so on.

arXiv:2511.16220Physical Review ResearchAug 18, 20260 citations

In this paper we describe an experiment of efficient cooling of

^{87}

Rb atoms in two-frequency diffuse laser lights. Compared with single frequency diffuse light, two-frequency diffuse lights have wider velocity capture range and thus can cool more atoms. In our experiment, the maximum number of cooled atoms can reach up to

3.9\times10^9

. Such a result is quite useful in building a compact cold atom clock.