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

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