Novel repumping on $^{3}$P$_{0}$$\rightarrow$$^{3}$D$_{1}$ for Sr magneto-optical trap and Land\'e g factor measurement of $^{3}$D$_{1}$

TL;DR

This paper introduces a novel repumping scheme and a self-assembled Zeeman slower to significantly enhance strontium atom trapping efficiency and accurately measure the Landé g factor of the $^{3}$D$_{1}$ state, advancing quantum technology applications.

Contribution

The study presents a new repumping method combined with a self-assembled Zeeman slower, achieving a 15-fold increase in atom number and precise Landé g factor measurement for $^{88}$Sr.

Findings

Atom number in blue MOT increased by a factor of 15.

Measured Landé g factor of $^{3}$D$_{1}$ is 0.4995(88).

Enhanced techniques benefit quantum applications.

Abstract

We realize an experimental facility for cooling and trapping strontium (Sr) atoms and measure the Land\'e g factor of $^{3}$D$_{1}$ of $^{88}$Sr. Thanks to a novel repumping scheme with the $^{3}$P$_{2}$$\rightarrow$$^{3}$S$_{1}$ and $^{3}$P$_{0}$$\rightarrow$$^{3}$D$_{1}$ combination and the permanent magnets based self-assembled Zeeman slower, the peak atom number in the continuously repumped blue MOT is enhanced by a factor of 15 with respect to the non-repumping case, and reaches $\sim$1 billion. Furthermore, using the resolved-sideband Zeeman spectroscopy, the Land\'e g factor of $^{3}$D$_{1}$ is measured to be 0.4995(88) showing a good agreement with the theoretical value of 0.4988. The results will have an impact on various applications including atom laser, dipolar interactions, quantum information and precision measurements.