Sub-Doppler spectroscopy of the near-UV Cs atom 6S${}_{1/2}$-7P${}_{1/2}$ transition in a microfabricated vapor cell

Abstract

We report on the characterization of sub-Doppler resonances detected by probing the 6S${}_{1/2}$-7P${}_{1/2}$ transition of Cs atom at 459 nm in a microfabricated vapor cell. The dependence of the sub-Doppler resonance (linewidth, amplitude) on some key experimental parameters, including the laser intensity and the cell temperature, is investigated. These narrow atomic resonances are of interest for high-resolution spectroscopy, instrumentation, and may constitute the basis of a near-UV microcell optical standard.