Buffer gas induced collision shift for the ${}^{88}$Sr ${}^1{\mathbf{S}}_0{-}^3{\mathbf{P}}_1$ clock transition

Abstract

Precision saturation spectroscopy of the ${}^{88}{\mathrm{Sr}}^1{S}_0{-}^3{P}_1$ is performed in a vapor cell filled with various rare gas including He, Ne, Ar, and Xe. By continuously calibrating the absolute frequency of the probe laser, buffer gas induced collision shifts of $\sim$kHz are detected with gas pressure of 1-20 mTorr. Helium gave the largest fractional shift of $1.6\times 10^{-9}{\mathrm{Torr}}^{-1}$. Comparing with a simple impact calculation and a Doppler-limited experiment of Holtgrave and Wolf [Phys. Rev. A {\bf 72}, 012711 (2005)], our results show larger broadening and smaller shifting coefficient, indicating effective atomic loss due to velocity changing collisions. The applicability of the result to the ${}^1{S}_0{-}^3{P}_0$ optical lattice clock transition is also discussed.

References in corpus (3)

• Sr lattice clock at 1x10^{-16} fractional uncertainty by remote optical evaluation with a Ca clock
• Precision spectroscopy and density-dependent frequency shifts in ultracold Sr
• Precision frequency measurement of visible intercombination lines of strontium

Cited by in corpus (1)

• Coherent Forward Broadening in Cold Atom Clouds