Measurement of the tune-out wavelength for 133Cs at 880 nm

We perform a measurement of the tune-out wavelength, lambda(0), between the D-1, 6(2)S(1/2) -> 6(2)P(1/2), and D-2, 6(2)S(1/2) -> 6(2)P(3/2), transitions for Cs-133 in the ground hyperfine state (F = 3, m(F) = +3). At lambda(0), the frequency-dependent scalar polarizability is zero leading to a zero scalar ac Stark shift. We measure the polarizability as a function of wavelength using Kapitza-Dirac scattering of a Cs-133 Bose-Einstein condensate in a one-dimensional optical lattice, and determine the tune-out wavelength to be lambda(0) = 880.21790(40)(stat)(8)(sys) nm. From this mea-surement we determine the ratio of reduced matrix elements to be vertical bar(6P(3/2)parallel to d parallel to 6S(1/2))vertical bar(2)/vertical bar(6P(1/2)parallel to d parallel to 6S(1/2))vertical bar(2) = 1.9808(2). This represents an improvement of a factor of 10 over previous results derived from excited-state lifetime measurements. We use the present measurement as a benchmark test of high-precision theory.

Automated summary

The study involves measuring the tune-out wavelength for Cs-133, finding the wavelength where scalar polarizability is zero, determining a relevant ratio with increased precision, and using the measurement as a benchmark for high-precision theory.