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Optics Communications

Measurement of cesium resonance line self-broadening and shift with doppler-free selective reflection spectroscopy

Vladan Vuletić, Vladimir A. Sautenkov, Claus Zimmermann, Theodor W. Hänsch

Published Jun 1, 1993• 50 citations
Publisher
DOI
10.1016/0030-4018(93)90076-h

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An investigation was made of selective specular reflection from 133Cs vapor in the range of atomic concentrations between 4×1013 and 2×1015 cm−3 where collisional broadening of the D2 line is less than the Doppler broadening. The radiation source was an injection laser. Intra-Doppler resonances corresponding to the hyperfine structure of the excited state were recorded in the selective reflection profile. Shifts of the reflection resonances relative to the luminescence resonances of the atomic beam did not exceed 50 MHz. The possiblity of using selective reflection for linear spectroscopy of atomic lines without Doppler broadening is discussed.
Electric-dipole-forbidden transitions play an important role in quantum sensing, quantum information, and fundamental tests in physics. As such, the development of novel and sensitive spectroscopic methods is of major interest. Here, we present a Doppler-free selective reflection experiment on the 62S1/2–52D5/2 electric-quadrupole transition of cesium vapor at the vicinity of a sapphire window. The spectrum is obtained by precision experiments overcoming limitations due to the small-signal amplitude of forbidden transitions. The observed sub-Doppler lines allow us to measure the collisional broadening of the electric-quadrupole line. The interaction of cesium atoms with the sapphire surface of the cell is also evidenced, but, due to its weak contribution, a quantitative analysis remains challenging. Our experiment paves the way for further studies of the Casimir–Polder interaction between exotic excited-state atoms and dielectric surfaces.