High-Flux Cold Ytterbium Atomic Beam Source Using Two-Dimensional Laser Cooling with Intercombination Transition

Abstract

We demonstrate a high-flux and low transverse temperature atomic beam of ytterbium by applying two-dimensional cooling using the ${}^1{\mathrm{S}}_0\text{-}{}^3{\mathrm{P}}_1$ intercombination transition to the cold atomic beam produced by the dipolar-allowed ${}^1{\mathrm{S}}_0\text{-}{}^1{\mathrm{P}}_1$ transition. The optimized transverse temperature of $11\pm 9\mu \mathrm{K}$ and an atomic flux of $(7.5\pm 1.0)\times 10^{8}atoms/s$ are obtained for the atomic beam whose longitudinal velocity is $30m/s$. The transverse temperature is maintained below $23\mu \mathrm{K}$, while the flux is above $6.5\times 10^{8}atoms/s$ in the longitudinal velocity range of $22-30m/s$. We also discuss the feasibility of further narrowing the transverse momentum width to less than the recoil momentum using the momentum-selective optical transition between the ground state and the long-lived metastable state. The transverse momentum width of our atomic beam, which is narrower than 5.7 times the recoil momentum, is a good starting point for the proposed method.

arXiv comment7 pages, 6 figures

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Cited by in corpus (1)

• A Compact Dual-Beam Zeeman Slower for High-Flux Cold Atoms