Improved measurement of the hyperfine structure of the laser cooling level $4f^{12}{(}^3{H}_6)5d_{5/2}6s^2$ $(J=9/2)$ in ${}^{169}$Tm

Abstract

We report on the improved measurement of the hyperfine structure of $4f^{12}{(}^3{H}_6)5d_{5/2}6s^2$ $(J=9/2)$ excited state in Tm-169 which is involved in the second-stage laser cooling of Tm. To measure the absolute value of the hyperfine splitting interval we used Doppler-free frequency modulation saturated absorption spectroscopy of Tm atoms in a vapor cell. The sign of the hyperfine constant was determined independently by spectroscopy of laser cooled Tm atoms. The hyperfine constant of the level equals $A_J=-422.112(32)$ MHz that corresponds to the energy difference between two hyperfine sublevels of $-2110.56(16)$~MHz. In relation to the saturated absorption measurement we quantitatively treat contributions of various mechanisms into the line broadening and shift. We consider power broadening in the case when Zeeman sublevels of atomic levels are taken into account. We also discuss the line broadening due to frequency modulation and relative intensities of transitions in saturated-absorption experiments.

References in corpus (2)

• Sub-Hz line width diode lasers by stabilization to vibrationally and thermally compensated ULE Fabry-Perot cavities
• Magneto-Optical Trap for Thulium Atoms

Cited by in corpus (4)

• Light assisted collisions in ultra-cold Tm atoms
• Precision Measurement of the Excited State Landé g-factor and Diamagnetic Shift of the Cesium D${}_2$ Line
• Experimental Investigation of the Hyperfine Structure of Tm I with Fourier Transform Spectroscopy, Part A: in the visible wavelength range 400 nm 700 nm
• Comparison of theory and experiment for radiative characteristics in neutral thulium