The effects of saturation and velocity selective population in two-step 6S1/2→6P3/2→6D5/2 laser excitation in cesium

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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“…35. It was shown that only approximately 1% of the ground state population could reach the 6D5/2 using cw narrow-linewidth lasers.…”

Section: F=3-f"=4mentioning

confidence: 99%

“…It is worth noting that the velocity-selective two-wavelength excitation of Cs atoms with the equivalent energy level configuration (6S1/2 → 6P3/2 → 6D5/2) was quantitatively analysed in Ref. 35.…”

Section: Rb Cellmentioning

confidence: 99%

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

et al. 2017

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“…Horvatic et al 242 determined the excited state population distributions, created by two-step 6 S 1/2 / 6 P 3/2 / 6 D 5/2 laser excitation in Cs vapour, by measuring the saturated and unsaturated absorption coefficients. Kroger et al 243 studied the hyperfine structure of the 4d 3 5s5p, 4d 4 5p and 4d 2 5s 2 5p configurations of Nb thereby elucidating effective one-electron parameters and theoretical predictions for the magnetic dipole hyperfine structure constants for their levels.…”

Section: Fundamentalsmentioning

confidence: 99%

Atomic spectrometry update. Advances in atomic emission, absorption, and fluorescence spectrometry, and related techniques

Evans

Day

Palmer

et al. 2008

J. Anal. At. Spectrom.

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“…Since the pioneering experiment on resonant laser plasma production in dense sodium vapor by Lucatorto and McIlrath [2], numerous ion investigations in Li [37], Na [8,9], Rb [10,11], and Cs [12,13] vapors excited by cw or pulsed laser light have been reported previously. These studies provide insight into (i) the ionization mechanism, (ii) energy transfer mechanisms which are implied in or serve the ionization.…”

Section: Introductionmentioning

confidence: 99%

Collisional Ionization in Lithium Vapor Excited by Nanosecond Laser Pulses

2012

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We report a theoretical study of the collisional ionization processes which occur under 2s → 2p excitation of lithium vapor excited with a nanosecond pulsed laser. The time evolution of the electron energy distribution function and the atomic ion density (Li + ) as well as the molecular ion density (Li + 2 ) at dierent lithium vapor densities was investigated. The results show a nonlinear behavior of the energy spectra of the electrons created during the interaction of the laser with the lithium vapor. The nonlinear behavior results from superelastic collisions between the free electrons produced by collisional ionization and photoionization with Li(2p). The results also show that a competition exists between the collisional ionization and photoionization processes in producing the atomic ion and the molecular ions.

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The effects of saturation and velocity selective population in two-step 6S1/2→6P3/2→6D5/2 laser excitation in cesium

Cited by 6 publications

References 36 publications

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

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

Atomic spectrometry update. Advances in atomic emission, absorption, and fluorescence spectrometry, and related techniques

Collisional Ionization in Lithium Vapor Excited by Nanosecond Laser Pulses

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