Single-resonance optical pumping spectroscopy and application in dressed-state measurement with atomic vapor cell at room temperature

Qiangbing Liang,Baodong Yang,Tiancai Zhang,Junmin Wang

doi:10.1364/oe.18.013554

Abstract

By monitoring the transmission of probe laser beam (also served as coupling laser beam) which is locked to a cycling hyperfine transition of cesium D(2) line, while pumping laser is scanned across cesium D(1) or D(2) lines, the single-resonance optical pumping (SROP) spectra are obtained with atomic vapor cell. The SROP spectra indicate the variation of the zero-velocity atoms population of one hyperfine fold of ground state, which is optically pumped into another hyperfine fold of ground state by pumping laser. With the virtue of Doppler-free linewidth, high signal-to-noise ratio (SNR), flat background and elimination of crossover resonance lines (CRLs), the SROP spectra with atomic vapor cell around room temperature can be employed to measure dressed-state splitting of ground state, which is normally detected with laser-cooled atomic sample only, even if the dressed-state splitting is much smaller than the Doppler-broaden linewidth at room temperature.

Highlights

High-resolution laser spectroscopy has important application in atomic and molecular physics, quantum optics, quantum metrology and so on
Based on the cascade two-photon resonance and optical pumping effect caused by two counter-propagating beams which interact with the ladder-type atomic system, another new type of the Doppler-free velocity-selective optical-pumping spectroscopy (VSOP) techniques, double-resonance optical pumping (DROP), was developed recently [1, 2]
When the pumping laser is scanned across cesium 6S1/2 F = 4 – 6P1/2 F’ = 3, 4 hyperfine transitions in D1 line, it leads to variation of transmission intensity of the coupling beam, and the Doppler-free single-resonance optical pumping (SROP) peaks appear on the position where single resonance happen

Summary

Introduction

High-resolution laser spectroscopy has important application in atomic and molecular physics, quantum optics, quantum metrology and so on. It is a very important tool for laser frequency stabilization [1, 2] and precision measurement of atomic hyperfine structure [3] and relevant important physical constants [4]. Based on the cascade two-photon resonance and optical pumping effect caused by two counter-propagating beams which interact with the ladder-type atomic system, another new type of the Doppler-free VSOP techniques, double-resonance optical pumping (DROP), was developed recently [1, 2]. DROP has been applied in laser frequency stabilization [1, 2] and the precision measurement of Rydberg atomic level [13]

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Conclusion