5 research outputs found
Dicke Coherent Narrowing in Two-Photon and Raman Spectroscopy of Thin Vapour Cells
The principle of coherent Dicke narrowing in a thin vapour cell, in which
sub-Doppler spectral lineshapes are observed under a normal irradiation for a
l/2 thickness, is generalized to two-photon spectroscopy. Only the sum of the
two wave vectors must be normal to the cell, making the two-photon scheme
highly versatile. A comparison is provided between the Dicke narrowing with
copropagating fields, and the residual Doppler-broadening occurring with
counterpropagating geometries. The experimental feasibility is discussed on the
basis of a first observation of a two-photon resonance in a 300 nm-thick Cs
cell. Extension to the Raman situation is finally considered
Laser spectroscopy with nanometric gas cells : distance dependence of atom-surface interaction and collisions under confinement
The high sensitivity of Laser Spectroscopy has made possible the exploration
of atomic resonances in newly designed "nanometric" gas cells, whose local
thickness varies from 20nm to more than 1000 nm. Following the initial
observation of the optical analogous of the coherent Dicke microwave narrowing,
the newest prospects include the exploration of long-range atom surface van der
Waals interaction with spatial resolution in an unprecedented range of
distances, modification of atom dielectric resonant coupling under the
influence of the coupling between the two neighbouring dielectric media, and
even the possible modification of interatomic collisions processes under the
effect of confinement
Testing the distance-dependence of the van der Waals interaction between an atom and a surface through spectroscopy in a vapor nanocell
This paper presents our current measurements in a vapor nanocell aiming at a
test of the distance-dependence of the atom-surface interaction, when simple
asymptotic descriptions may turn to be not valid. A state-of-the-art of
atom-surface interaction measurements is provided as an introduction, along
with the comparison with the theory of the van der Waals (or Casimir-Polder)
interaction; it is followed by a presentation of the most salient features of
nanocell spectroscop
Analysing the atom-surface interaction through nanocell spectroscopy
8-11 Octobre 2005, communication orale présentée par I. Mauri