0000000000819995
AUTHOR
Bruno Lavorel
High density molecular gases in strong ultrashort laser fields: Alignment and collisional relaxation
Talk given by B. Lavorel; International audience
Non-equilibrium monitoring using self-phase modulation
2 pages; International audience; Laser induced self-phase modulation phenomenon is observed in a blackberry juice using moderate beam intensity. The sample content qualities can be quantified by measuring optical parameters, we show the possibility to use the nonlinear in an on-line homogeneity monitoring.
Rotational excitation with femtosecond pulses : from high resolution spectroscopy to molecular alignment
International audience
Wavelength dependence of multiphoton ionization of xenon
International audience; We have studied the multiphoton ionization of xenon atoms by 160 fs pulses at intensities of 531012 and 1.331013 W/cm2 and present photoelectron kinetic energy and angular distribution spectra measured with a photoelectron imaging spectrometer. A noncollinear optical parametric amplifier allows us to tune the wavelength of the laser pulse over a range between 500 and 700 nm. Resonant and nonresonant processes as well as channel switching effects have been observed in this intensity and wavelength regime. Mainly resonant s5+1d-photon ionization via ns, nd, and nd8 Rydberg states was studied in the region of 505–602 nm. Resonance structures were found related to the tw…