M. Fichet
University of Paris
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Featured researches published by M. Fichet.
EPL | 1991
M. Oria; Martine Chevrollier; Daniel Bloch; M. Fichet; M. Ducloy
Red frequency shift and line asymmetry have been observed in selective reflection spectroscopy at a dielectric/Cs-vapour interface, which have been attributed to surface-induced Van der Waals attraction. This opens the way to studying surface interaction on low-lying, short-lived, excited states.
Applied Physics B | 2008
Athanasios Laliotis; I. Maurin; M. Fichet; Daniel Bloch; M. Ducloy; Nikolai Balasanyan; Apetnak Sarkisyan; D. Sarkisyan
A special vapour cell has been built, that allows the measurement of the atom–surface van der Waals interaction exerted by a CaF2 window at the interface with Cs vapour. Mechanical and thermal fragility of fluoride windows make common designs of vapour cells impractical, so that we have developed an all-sapphire sealed cell with an internal CaF2 window. Although some impurities have remained when filling up the prototype cell, leading to line broadening and a shift, the selective reflection spectrum of the Cs D1 line (894xa0nm) makes apparent the weak van der Waals surface interaction. The uncertainties introduced by the effects of these impurities in the van der Waals measurement are nearly eliminated when comparing the selective reflection signal at the CaF2 interface of interest and at a sapphire window of the same cell. The ratio of the interactions respectively exerted by a sapphire interface and a CaF2 interface is found to be 0.55±0.25, in good agreement with the theoretical evaluation of ∼0.67.
Proceedings of the 12th International conference on spectral line shapes | 2008
M. Fichet; N. Papagiorgiou; F. Schuller; Daniel Bloch; M. Ducloy
Selective reflection spectroscopy at an interface with a low density resonant vapor, combined with a frequency modulation technique (FM‐SR) is a high resolution Doppler‐free method for probing atoms interacting with a surface. We analyze the spectral consequences of the van der Waals‐London attraction potential between the atomic dipole and its instantaneous image.We show that FM‐SR provides a way to analyze separately for each hyperfine component, collisional processus on a resonance line.Finally, we present a new formulation for the van der Waals interaction between a dispersive dielectric surface and an atom in an arbitrary internal energy state. We show that for excited atoms with dipole couplings in emission, giant surface attraction or repulsion is predicted much larger than for perfect reflector.
european quantum electronics conference | 2005
I. Hamdi; Petko Todorov; L. Maurin; A. Yarovitski; D. Sarkisyan; M.-P. Gorza; M. Fichet; Daniel Bloch; M. Ducloy
The collisional effects in nanocell spectroscopy are investigated. Experiments performed on the well-resolved Cs D/sub 1/ line (894 nm), have enabled a simultaneous comparison of /spl lambda//2 and /spl lambda//4 thickness for various densities. Because nanocell spectroscopy, when performed under normal incidence irradiation, allows a sub-Doppler resolution owing to the velocity-selection operated by the transient regime of optical interaction, the pressure behaviour of the various hyperfine components can be studied individually. Considerable differences are found to occur for the pressure-induced shift, as already observed through selective reflection (SR) spectroscopy on the Cs D/sub 2/ line.
european quantum electronics conference | 2003
M. Fichet; H. Failache; Solomon M. Saltiel; M.-P. Gorza; Daniel Bloch; M. Ducloy
Analysis of the data of FM SR lineshapes using a fitting method that simultaneously accounts for the dispersive and the dissipative effects of the resonant coupling. In the theoretical model, two dimensionless parameters A and B describe the overall z/sup -3 /coupling. A=2k/sup 3/C/sub 3///spl gamma//sub 0/ represents the strength of the vW attraction (/spl gamma//sub 0,/ homogeneous linewidth) and B = k/sup 3//spl Gamma/ (k = /spl omega//sub 0//c with /spl omega//sub 0 /the frequency of the probed transition in the free space) is for the modified decay rate, with the resonantly-enhanced transition width defined by:/spl gamma/(z) = /spl gamma//sub 0/(1+/spl Gamma//z/sup 3/). The experiments are performed on Cs (6D/sub 3/2/) interacting with a sapphire surface with its c-axis parallel to the surface. Fits are carried out for the two hyperfine components (F = 3 and F = 4) of the probed transition 6P/sub 1/2/ /spl rarr/ 6D/sub 3/2/, and for different values of the Cs temperature. In comparison, present report deals with a situation when the two parameters A and B are comparable, as due to the detuning of the sapphire polariton resonance with the birefringence orientation axis: indeed, for a c-axis parallel to the sapphire window, the atomic de-excitation channel is close to the center of the surface resonance, and this tends to maximize the dissipative effects, while the associated dispersive effect is no longer the dominant one.
1992 Shanghai International Symposium on Quantum Optics | 1992
Martine Chevrollier; M. Fichet; M. Oria; Daniel Bloch; Martial Ducloy
The atomic response to resonant light irradiation near vapor-dielectric interfaces is monitored via high-resolution reflection spectroscopy. One demonstrates that this Doppler-free spectroscopic technique yields a novel probe of atomic dynamics and QED atom-surface long- range interaction. It provides for the first time a spectral evidence of van der Waals attraction, and the method is intrinsically applicable to the observation of surface interaction exerted on excited atoms. Effects related with atomic excitation level, nature of the dielectrics, and atomic collisions are discussed.
Journal De Physique Ii | 1992
Martine Chevrollier; M. Fichet; M. Oria; Gabriel Rahmat; Daniel Bloch; M. Ducloy
Physical Review A | 1995
M. Fichet; F. Schuller; Daniel Bloch; M. Ducloy
Journal De Physique Ii | 1991
M. Ducloy; M. Fichet
european quantum electronics conference | 1998
H. Failache; M. Fichet; Solomon M. Saltiel; Daniel Bloch; M. Ducloy