Saturated absorption spectroscopy of Xe using a GaAs semiconductor laser

Abstract

Doppler-free absorption spectrum from 5P 56S to 5P 56P transitions of Xe in a hollow cathode discharge was measured in the wavelength region from 810 to 910 nm. The saturated dip signals detected by a frequency modulated probe beam were doubly AM-modulated by a pump beam chopped using a conventional mechanical chopper. The Doppler background was greatly reduced by detection using a second lock in amplifier synchronous to the chopping signal. The isotope shifts of even mass 136−128Xe in natural abundance were resolved for the five transitions from the metastable states of J=2 and 0, while in the transitions from the J=1 states were partially resolved. The nuclear magnetic and quadrupole hyperfine coupling constants of 131Xe and 129Xe determined are listed with those reported previously. The specific mass shifts and the field shifts were estimated using the relation given by King's diagram and compared with those obtained from the changes in the mean square-radii of the nuclear charge distribution.