Engineering Papers⌕ Search

SEARCH · Engineering Papers

Results for “ATOM”

Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 163 records · Page 9
All sourcesNASA NTRSDOE OSTI
DOE OSTI2013

Cascaded two-photon spectroscopy of Yb atoms with a transportable effusive atomic beam apparatus

We present a transportable effusive atomic beam apparatus for cascaded two-photon spectroscopy of the dipole-forbidden transition (6s{sup 2} {sup 1}S{sub 0}{r_reversible} 6s7s {sup 1}S{sub 0}) of Yb atoms. An ohmic-heating effusive oven is designed to have a reservoir volume of 1.6 cm{sup 3} and a high degree of atomic beam collimation angle of 30 mrad. The new atomic beam apparatus allows us to detect the spontaneously cascaded two-photons from the 6s7s{sup 1}S{sub 0} state via the intercombination 6s6p{sup 3}P{sub 1} state with a high signal-to-noise ratio even at the temperature of 340 Degree-Sign C. This is made possible in our apparatus because of the enhanced atomic beam flux and superior detection solid angle.

71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSIC↗
DOE OSTI2012

Two-photon scattering of a tightly focused weak light beam from an atomic ensemble: an optical probe to detect atomic level structures

We study two-photon scattering of a tightly focused weak light beam from an atomic ensemble of two-level atoms (2LAs). The scaling of the two-photon nonlinearity at the single photon resonance shows a non-monotonic behaviour with increasing number of few identical 2LAs. We find single photon transport in a system of two 2LAs is similar to that in a V−type three-level atom (3LA). However two photon transport in these two systems shows very different line-shapes. When the single photon transmission is zero in these systems, two transmitted photons are bunched together in a V−type 3LA, while their correlation is zero in two 2LAs. The difference in the two-photon line-shape persists for few 2LAs and 3LAs. Therefore, the two-photon scattering of a tightly focused weak light beam can be used as a probe to detect atomic level structures of different atoms with similar transition energies.

71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSIC↗