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Applied Physics B

Resolution enhancement in noise spectrum by using velocity selective optical pumping in cesium vapor

Yuan Li, De-Huan Cai, Rong Ma, Dan Wang, Jiangrui Gao, Junxiang Zhang

Published Oct 13, 2012• 8 citations
Publisher
DOI
10.1007/s00340-012-5211-6

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We study resonance redistribution mechanisms inside a hot vapor cell. This is achieved by pumping cesium atoms on the 6S 1/2 →6P 1/2 resonance and subsequently probing the velocity distribution of the 6P 1/2 population by a linear absorption experiment on the 6P 1/2 →16S 1/2 or 6P 1/2 →15D 3/2 transitions at 514 nm and 512 nm, respectively. We demonstrate that despite the existence of thermalization processes, traces of the initial velocity selection, imposed by the pump, survive in both hyperfine levels of the intermediate (6P 1/2 ) state. This observation allows us to perform sub-Doppler resolution vapor cell spectroscopy on Rydberg states using a simple pump–probe setup. At high cesium densities, redistribution mechanisms dominate, and the velocity selection vanishes. However, spectral analysis provides the collisional shifts and broadenings of the probed Rydberg states.

arXiv:2501.02665•Optics Letters•Dec 17, 2024•3 citations
Two schemes of Doppler-free high-resolution velocity-selective optical-pumping atomic spectroscopy, named single-resonance optical pumping (SROP) and double-resonance optical pumping (DROP), are performed and characterized with room-temperature cesium vapor cells. Due to velocity-selective optical pumping from one hyperfine fold of ground state to another via one-photon excitation in SROP or cascade two-photon excitation in DROP and decay processes thereafter, the atomic population variation of one hyperfine fold of ground state is indicated by SROP and DROP spectra by using of the transmission of the probe laser which is usually frequency locked to a cycling hyperfine transition. As a result, SROP and DROP spectra often have flat background and higher signal-to-noise ratio. Therefore, SROP and DROP spectra are very useful for measurement of the dressed-state splitting of ground state with an alkali atomic vapor cell, precise measurement of hyperfine splitting of alkali atomic excited states, frequency references for laser frequency stabilization, two-color MOT, and so on.
We study resonance redistribution mechanisms inside a hot vapor cell. This is achieved by pumping cesium atoms on the 6S 1/2 →6P 1/2 resonance and subsequently probing the velocity distribution of the 6P 1/2 population by a linear absorption experiment on the 6P 1/2 →16S 1/2 or 6P 1/2 →15D 3/2 transitions at 514 nm and 512 nm, respectively. We demonstrate that despite the existence of thermalization processes, traces of the initial velocity selection, imposed by the pump, survive in both hyperfine levels of the intermediate (6P 1/2 ) state. This observation allows us to perform sub-Doppler resolution vapor cell spectroscopy on Rydberg states using a simple pump–probe setup. At high cesium densities, redistribution mechanisms dominate, and the velocity selection vanishes. However, spectral analysis provides the collisional shifts and broadenings of the probed Rydberg states.