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arXiv:2501.18266

Doppler-free spectroscopy of the Cs $6\text{S}_{1/2}-7\text{P}_{3/2}$ atomic transition at 456 nm in a nanometric-thick vapor layer

Armen D. Sargsyan, Emmanuel Klinger, Rodolphe Boudot, David G. Sarkisyan

Published Jan 30, 2025• 0 citations
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Abstract

The features of Doppler-free resonances detected by probing the $^{133}$Cs 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 D$_2$ line (852 nm). When the vapor layer thickness is $\ell = λ/2 \simeq 230$ 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 $\ell\simeq 460$ 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.

DOI
10.48550/arxiv.2501.18266

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The features of Doppler-free resonances detected by probing the 133^{133}133Cs atom 6S1/2−7P3/26S_{1/2}-7P_{3/2}6S1/2​−7P3/2​ 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_22​ line (852 nm). When the vapor layer thickness is ℓ=λ/2≃230\ell = λ/2 \simeq 230ℓ=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\ell\simeq 460ℓ≃460 nm in a single-pass configuration, we observe Doppler-free resonances with a linewidth <20<20<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.
The features of Doppler-free resonances detected by probing the 133 Cs 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 D 2 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 of <20 MHz, located at the atomic transition 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.
Sub-Doppler spectroscopy of the near-UV Cs atom 6S1/2_{1/2}1/2​-7P1/2_{1/2}1/2​ transition in a microfabricated vapor cell
We report on the characterization of sub-Doppler resonances detected by probing the 6S1/2_{1/2}1/2​-7P1/2_{1/2}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.
Abstract Selective reflection (SR) spectroscopy of the 6 s 2 S 1 / 2 → 7 p 2 P 3 / 2 electric dipole transition of Caesium ( λ = 456 nm) is performed for the first time using a nanometric-thin cell (L = 50–1500 nm, T = 200 ∘ C). We successfully form narrow resonances corresponding to the F g = 3 , 4 → F e = 2 , 3 , 4 , 5 hyperfine transitions. All transitions are well spectrally resolved, and the geometry of the cell allows us to obtain a strong 30 times narrowing of the Doppler width with a single beam pass. For lower thicknesses ( L < 400 nm), we observe a red shift of the SR lines, which we attribute to atom-surface interactions, and provide estimates of the C 3 interaction coefficient. The oscillator strengths of the 6 s 2 S 1 / 2 → 7 p 2 P 3 / 2 hyperfine transitions are about two orders of magnitude smaller than that of the Cs D 2 line at 852 nm. Our experimental measurements are in good agreement with theoretical calculations. We emphasize the advantage of nanocell spectroscopy compared to the well-known saturated absorption method and present possible applications.
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Abstract The sub-Doppler absorption and fluorescence spectra at the frequencies of D1- and D2-line transitions in Cs atomic vapor, enclosed in a nanocell (NC) with a thickness L ~ 400 nm, have been investigated experimentally at a near-room temperature. It is shown that a decrease in the NC temperature to 35°C causes narrowing of the absorption lines to values smaller than the Doppler width by a factor of 6, due to which the strong spectral broadening induced by laser field can be measured. The high intensity threshold for optical pumping (which limits the fluorescence intensity in centimeter-length cells) made it possible to record fluorescence spectra (using laser power of several milliwatts) at a temperature of 20°C; thus, a frequency marker of transitions in the range of D1,2 lines can be developed based on a room-temperature NC. A comparison with a widely used marker based on saturated absorption is performed.