The effect of nonlinear polarization rotation of elliptically polarized laser pulses in solutions of fullerene (C70)
in organic solvents and their mixtures has been experimentally studied. The nonlinear refractive index n2 and nonlinear
cubic susceptibility Reχ(3) (ω;ω,ω,-ω) of these solutions have been defined. The correlation between the process of C70 cluster formation in solutions and the angle of self-induced polarization rotation of passing laser beam was demonstrated. The physical mechanism of self-induced optical activity in solutions is discussed.
The laser induced nonlinear polarization rotation effect in a solution of Glycine has been investigated. The experimental data on polarization rotation of the laser beam are presented and have been used to determine of the third- order molecular susceptibility for the process of interest.
Rubidium vapor (1011 - 1014 cm-3) was irradiated by a dye-laser beam (10 kW(DOT)cm-2 - 2 MW(DOT)cm-2, pulse duration approximately 30 nsec, linewidth <EQ 0.25 cm-1), which was tuned to the D1,2-resonance lines. The mutual competition of the two photon ionization, associative ionization and Penning ionization of the laser excited rubidium atoms was investigated. The data of laser intensities and a rubidium vapor concentrations, which results in domination of the each ionization channels were founded. On the basis of the received experimental results, the cross-section values for the multiphoton and collisional ionization channels of laser-excited atoms were determined.