Optical cascade pumping of the 7P<sub>3/2</sub>level in cesium atoms

Kargapol'tsev, Sergei V; Velichansky, V. L.; Yarovitsky, Alexander V; Тайченачев, А. В.; Yudin, V. I.

doi:10.1070/qe2005v035n07abeh003570

Cited by 11 publications

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“…In thermal vapors, ladder EIT is only possible when the lower transition is probed [15] and the probe wavelength is greater than the coupling wavelength [16]. Alternatively, on strong transitions such as the infrared transitions from excited states in alkali atoms, one can probe directly on the excited state transition and detect absorption or fluorescence [17,18].…”

Section: Introductionmentioning

confidence: 99%

Subnatural linewidths in two-photon excited-state spectroscopy

et al. 2012

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Publisher's copyright statement:Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. We investigate, theoretically and experimentally, absorption on an excited-state atomic transition in a thermal vapor where the lower state is coherently pumped. We find that the transition linewidth can be subnatural, that is, less than the combined linewidth of the lower and upper state. For the specific case of the 6P 3/2 → 7S 1/2 transition in room temperature cesium vapor, we measure a minimum linewidth of 6.6 MHz compared with the natural width of 8.5 MHz. Using perturbation techniques, an expression for the complex susceptibility is obtained which provides excellent agreement with the measured spectra.

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Section: Introductionmentioning

confidence: 99%

Subnatural linewidths in two-photon excited-state spectroscopy

et al. 2012

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“…Thus, the width of the Doppler-free fluorescence resonances depends on a ratio between two processes. Theoretical modeling of the corresponding excitation in Cs atoms [23] shows that the contribution of the two-photon process prevails at high power. The typical FWHM of experimentally observed fluorescence resonances (Fig.…”

Section: Two-photon Resonances On the 5smentioning

confidence: 99%

Doppler-free two-photon resonances for atom detection and sum frequency stabilization

Akulshin¹,

Hall²,

Ivannikov³

et al. 2011

J. Phys. B: At. Mol. Opt. Phys.

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We investigate the excitation of the 5D 5/2 level in Rb atoms using counterpropagating laser beams, which are nearly resonant to the one-photon 5S 1/2 → 5P 3/2 and 5P 3/2 → 5D 5/2 transitions, ensuring that a sum of the optical frequencies corresponds to the 5S 1/2 → 5D 5/2 transition. The excitation produced by two-photon and step-wise processes is detected via spontaneously emitted fluorescence at 420 nm arising from the 6P 3/2 → 5S 1/2 transition. The dependences of blue fluorescence intensity on atomic density and laser detuning from the intermediate 5P 3/2 level have been investigated. The sensitivity of the frequency detuned bi-chromatic scheme for atom detection has been estimated. A novel method for sum frequency stabilization of two free-running lasers has been suggested and implemented using two-photon Doppler-free fluorescence and polarization resonances.

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“…Numerical modelling of the excitation of Cs atoms in the corresponding energy level system showed that the contribution of the two-photon process prevails at higher laser intensity [24]. Velocity-selective and velocity-insensitive excitation produced by co-and counter-propagating radiation at 780 and 776 nm can be distinguished for the detuned radiation (δ≠0), as the resonant condition for two processes are separated by 2δ.…”

Section: Two-photon Excitation: General Considerationsmentioning

confidence: 99%

“…Typically, the collected fluorescence and applied laser light are spectrally separated, dramatically simplifying the detection procedure. Other popular methods are based on detecting absorption or polarization rotation of the applied laser light transmitted through an atomic sample [24,25,26]. Detection of new optical fields generated by ASE is less common [27].…”

Section: Two-photon Excitation: General Considerationsmentioning

confidence: 99%

Amplified spontaneous emission at 523 μm in two-photon excited rubidium vapor

et al. 2017

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Abstract. Population inversion on the 5D5/2-6P3/2 transition in Rb atoms produced by cw laser excitation at different wavelengths has been analysed by comparing the generated mid-IR radiation at 5.23 μm originating from amplified spontaneous emission (ASE) and isotropic blue fluorescence at 420 nm. Using a novel method for detection of two photon excitation via ASE, we have observed directional coand counter-propagating emission at 5.23 μm. Evidence of a threshold-like characteristic is found in the ASE dependences on laser detuning and Rb number density. We find that the power dependences of the backward-and forwarddirected emission can be very similar and demonstrate a pronounced saturation characteristic, however their spectral dependences are not identical. The presented observations could be useful for enhancing efficiency of frequency mixing processes and new field generation in atomic media.

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Optical cascade pumping of the 7P_3/2level in cesium atoms

Cited by 11 publications

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Subnatural linewidths in two-photon excited-state spectroscopy

Subnatural linewidths in two-photon excited-state spectroscopy

Doppler-free two-photon resonances for atom detection and sum frequency stabilization

Amplified spontaneous emission at 523 μm in two-photon excited rubidium vapor

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Optical cascade pumping of the 7P3/2level in cesium atoms

Cited by 11 publications

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Subnatural linewidths in two-photon excited-state spectroscopy

Subnatural linewidths in two-photon excited-state spectroscopy

Doppler-free two-photon resonances for atom detection and sum frequency stabilization

Amplified spontaneous emission at 523 μm in two-photon excited rubidium vapor

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Optical cascade pumping of the 7P_3/2level in cesium atoms