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Influence of Inelastic and Velocity Changing Collisions on Density Shift and Width of Laser Saturation Resonances

Klaus Peter Jungmann, E. W. Weber

European Conference on Atomic PhysicsJan 1, 19810 citations

Comparison of the Dependence of Saturated Absorption Spectra of 87Rb D2 line on the Beam Size and the Intensity

Heung‐Ryoul Noh, Geol Moon, Huy Diep

Bulletin of the American Physical SocietyJun 7, 20070 citations

Comparison of the Dependence of Saturated Absorption Spectra of the 87Rb D2 Lines on the Beam Cross-section and the Intensity

Geol Moon, NohHeungRyoul

New Physics Sae MulliJan 1, 20070 citations

Rates for Velocity-Changing Collisions in Optically Pumped Rubidium Laser

Douglas E. Thornton, Grady T. Phillips, Glen P. Perram

The Diode Pumped Alkali Laser (DPAL) is an optically-pumped three-level laser system with significant promise for scaling to high power. The rates for velocity changing collisions in the rubidium laser have been measured using sub-Doppler laser saturation spectroscopy. Spectra of the F”=2 to F’=1,2,3 hyperfine components of the Rb S1/2 – P3/2 D2 transition were observed for argon pressures of 0-110 mTorr and modulation frequencies of 700 3200 Hz. Sub-Doppler features with linewidths of about 23 MHz, or about four times the natural linewidth, were observed for the hyperfine transitions and cross-over resonances. A Doppler pedestal is also observed which increases with pressures and decreases with modulation frequency. The size of the Doppler pedestal relative to the homogeneous features yields a rate for reversing the direction of all velocity groups of 3.2 x 10 cm s.The Diode Pumped Alkali Laser (DPAL) is an optically-pumped three-level laser system with significant promise for scaling to high power. The rates for velocity changing collisions in the rubidium laser have been measured using sub-Doppler laser saturation spectroscopy. Spectra of the F”=2 to F’=1,2,3 hyperfine components of the Rb S1/2 – P3/2 D2 transition were observed for argon pressures of 0-110 mTorr and modulation frequencies of 700 3200 Hz. Sub-Doppler features with linewidths of about 23 MHz, or about four times the natural linewidth, were observed for the hyperfine transitions and cross-over resonances. A Doppler pedestal is also observed which increases with pressures and decreases with modulation frequency. The size of the Doppler pedestal relative to the homogeneous features yields a rate for reversing the direction of all velocity groups of 3.2 x 10 cm s.

AIAA Plasmadynamics and Lasers ConferenceJun 28, 20100 citations

Collisional Spectroscopy of Laser Excited Atoms

M. Allegrini

NATO ASI series. Series B : PhysicsJan 1, 19850 citations

Fine-structure changing collisions in 87Rb upon D2 excitation in the hyperfine Paschen-Back regime

Clare R. Higgins, Danielle Pizzey, Ifan G. Hughes

Abstract We investigate fine structure changing collisions in 87Rb vapour upon D2 excitation in a thermal vapour at 75 ∘C; the atoms are placed in a 0.6 T axial magnetic field in order to gain access to the hyperfine Pashen-Back regime. Following optical excitation on the D2 line, the exothermic transfer 5P 3 / 2 → 5P 1 / 2 occurs as a consequence of buffer-gas collisions; the 87Rb subsequently emits a photon on the D1 transition. We employ single-photon counting apparatus to monitor the D1 fluorescence, with an etalon filter to provide high spectral resolution. By studying the D1 fluorescence when the D2 excitation laser is scanned, we see that during the collisional transfer process the m J ′ quantum number of the atom changes, but the nuclear spin projection quantum number, m I ′ , is conserved. A simple kinematic model incorporating a coefficient of restitution in the collision accounted for the change in velocity distribution of atoms undergoing collisions, and the resulting fluorescence lineshape. The experiment is conducted with a nominally ‘buffer-gas free’ vapour cell; our results show that fine structure changing collisions are important with such media, and point out possible implications for quantum-optics experiments in thermal vapours producing entangled photon pairs with the double ladder configuration, and solar physics magneto-optical filters.Abstract We investigate fine structure changing collisions in 87Rb vapour upon D2 excitation in a thermal vapour at 75 ∘C; the atoms are placed in a 0.6 T axial magnetic field in order to gain access to the hyperfine Pashen-Back regime. Following optical excitation on the D2 line, the exothermic transfer 5P 3 / 2 → 5P 1 / 2 occurs as a consequence of buffer-gas collisions; the 87Rb subsequently emits a photon on the D1 transition. We employ single-photon counting apparatus to monitor the D1 fluorescence, with an etalon filter to provide high spectral resolution. By studying the D1 fluorescence when the D2 excitation laser is scanned, we see that during the collisional transfer process the m J ′ quantum number of the atom changes, but the nuclear spin projection quantum number, m I ′ , is conserved. A simple kinematic model incorporating a coefficient of restitution in the collision accounted for the change in velocity distribution of atoms undergoing collisions, and the resulting fluorescence lineshape. The experiment is conducted with a nominally ‘buffer-gas free’ vapour cell; our results show that fine structure changing collisions are important with such media, and point out possible implications for quantum-optics experiments in thermal vapours producing entangled photon pairs with the double ladder configuration, and solar physics magneto-optical filters.

arXiv:2408.11689Journal of Physics B Atomic Molecular and Optical PhysicsOct 24, 20244 citations

Velocity changing collisions in the laser saturation spectra of 87Rb D2 F″ = 2

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Velocity changing collisions in the laser saturation spectra of 87Rb D2 F″ = 2

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