11 research outputs found
Lasing on the D_2 line of sodium in helium atmosphere due to optical pumping on the D_1 line (up-conversion)
A new method is proposed to produce population inversion on transitions
involving the ground state of atoms. The method is realized experimentally with
sodium atoms. Lasing at the frequency corresponding to the sodium D_2 line is
achieved in the presence of pump radiation resonant to the D_1 line with helium
as a buffer gas.Comment: 4 pages, 4 figures, Late
Conoscopic patterns in photonic band gap of cholesteric liquid crystal cells with twist defects
We theoretically investigate into the effects of the incidence angles in
light transmission of cholesteric liquid crystal two-layer sandwich structures
with twist defects created by rotation of the one layer about the helical
axis.The conoscopic images and polarization resolved patterns are obtained for
thick layers by computing the intensity and the polarization parameters as a
function of the incidence angles.In addition to the defect angle induced
rotation of the pictures as a whole, the rings of defect mode resonances are
found to shrink to the origin and disappear as the defect twist angle varies
from zero to its limiting value and beyond.Comment: revtex4, 7 pages, 4 figure
Quantum properties of a parametric four-wave mixing in a Raman type atomic system
We present a study of the quantum properties of two light fields used to parametric four-wave mixing in a Raman type atomic system. The system realizes an effective Hamiltonian of beamsplitter type coupling between the light fields, which allows to control squeezing and amplitude distribution of the light fields, as well as realizing their entanglement. The scheme can be feasibly applied to engineer the quantum properties of two single-mode light fields in properly chosen input states
Quantum properties of a parametric four-wave mixing in a Raman type atomic system
We present a study of the quantum properties of two light fields used to parametric four-wave mixing in a Raman type atomic system. The system realizes an effective Hamiltonian of beamsplitter type coupling between the light fields, which allows to control squeezing and amplitude distribution of the light fields, as well as realizing their entanglement. The scheme can be feasibly applied to engineer the quantum properties of two single-mode light fields in properly chosen input states