Doppler-free spectroscopy of the Cs 6S_1/2-7P_3/2 atomic transition at 456 nm in a nanometric-thick vapor layer

2025/01/30 by A. Sargsyan, Emmanuel Klinger, Sargsyan, A. +5
Physics and Astronomy · #Atomic and Subatomic Physics Research #Cold Atom Physics and Bose-Einstein Condensates #Quantum optics and atomic interactions

paper · pdf · doi:10.48550/arxiv.2501.18266

Abstract

The features of Doppler-free resonances detected by probing the ¹³³Cs atom 6S_1/2-7P_3/2 transition at 456 nm in a nanometric-thick vapor layer are investigated. The matrix element of this transition is about 11 times smaller than that of the Cs D₂ line (852 nm). When the vapor layer thickness is ℓ = λ/2 ≃ 230 nm, we observe Dicke narrowing of the lines, accompanied by a red frequency shift of the atomic transitions, which is attributed to atom-surface interactions. Realizing optical pumping with ℓ≃ 460 nm in a single-pass configuration, we observe Doppler-free resonances with a linewidth <20 MHz, located at the atomic transitions frequencies with a correspondence of the amplitudes to the transition intensities. These narrow resonances are of interest for high-resolution spectroscopy and instrumentation, and could serve as a frequency reference.

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