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Acta Physica Sinica

Monoenergetic atomic beam deflection by resonant light pressure

Yuzhu Wang

Published Apr 1, 1983• 1 citation
OpenAlex

Abstract

We have calculated the deflections of nearly monoenergetic atomic beams under resonant laser light pressure. These deflection experiments may be used to analyze the velocity distributions in atomic beams, to measure the lifetimes of excited states of atoms, and to verify the theory of photon statistics.

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DEFLECTION OF SODIUM ATOMIC BEAM BY RESONANCE LIGHT PRESSURE OF MULTI-LASER-BEAM

Yo-Zhu Wang, Ru-Bing Zhou, Zhiyao Zhou +5 more

In this paper we report an experimental study on the deflection of a sodium atomic beamby the resonance light pressure of a multi-laser-beam. We have used the multi-laser-beam tointeract with an atomic beam in order to increase the amount of deflection and to reduce con-siderably the need for laser power. A deflection angle of 1.0×10~(-2) rad and the corresponding displacement of 0.72 cm wereobtained. However, only one dye laser was used to illuminate an atomic beam. A method of laser-induced fluorescence of an atomic beam was employed to probe thedeflection of the atomic beam.

Science in China Series A-Mathematics Physics Astronomy & Technological Science•Aug 20, 1984•0 citations
A method is proposed for generating a near-monoenergetic atomic beam by deflection resulting from the pressure of light of a resonance frequency. A system in which a beam of atoms passes through N periodically distributed regions of interaction with laser radiation is considered: the system ensures a high selectivity in respect of the atomic velocities. The following applications of deflection of monoenergetic atoms are considered: analysis of the velocity distribution in an atomic beam, determination of the lifetime of excited atomic states, and testing of the theory of photon statistics.
Photon-number statistics in resonance fluorescence is studied through the deflection of a beam of neon atoms in the metastable 3^{3}3P2{\mathit{P}}_{2}P2​ state by radiation pressure. An analysis of the deflection profile leads to experimental values for the Mandel Q parameter as a function of laser intensity and detuning for different laser polarizations. The results confirm the predicted predominantly sub-Poissonian statistics. Good agreement is demonstrated with the results of a Monte Carlo calculation based on a pure-state analysis of resonance fluorescence.
We have performed experimental and theoretical studies of the deflection of a sodium atomic beam by a laser tuned to the 3 2{\mathrm{}}^{2}2S1/2{S}_{1/2}S1/2​,F=2--3 2{\mathrm{}}^{2}2P3/2{P}_{3/2}P3/2​,F=3 transition. The intensity profile of the deflected beam was measured at different laser power levels and for different laser polarizations. Calculations using a constant force derived from a two-level atom yield deflections which are too large. The results of more realistic simulation calculations agree very well with the measured deflection. Those calculations incorporate the atomic-beam spatial and velocity distributions as well as the laser frequency distribution and polarization state. Optical pumping, loss of atoms to the nonresonant F=1 ground state, and Doppler shifting of the atoms out of resonance are all considered, as also are the statistics and angular distributions of the spontaneous photons.
In this paper we report an experimental study on the deflection of a sodium atomic beamby the resonance light pressure of a multi-laser-beam. We have used the multi-laser-beam tointeract with an atomic beam in order to increase the amount of deflection and to reduce con-siderably the need for laser power. A deflection angle of 1.0×10~(-2) rad and the corresponding displacement of 0.72 cm wereobtained. However, only one dye laser was used to illuminate an atomic beam. A method of laser-induced fluorescence of an atomic beam was employed to probe thedeflection of the atomic beam.