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Optics Communications

Effect of collisions with surface on nonlinear optical properties and nonlinear selective reflection

Suneel Pratap Singh, G. S. Agarwal

Published Aug 1, 1986• 10 citations
Publisher
DOI
10.1016/0030-4018(86)90459-1

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We study the cascade three-level selective-reflection spectroscopy for normal incidence at a dielectric--atomic-vapor interface in a pump-probe scheme. Taking into account the effects of spatial dispersion arising from deexcitation by collisions with the interface and the transient response of atoms leaving the surface, we evaluate the modification of the probe-field reflection induced by the presence of the pump field in terms of a nonlocal nonlinear susceptibility. The dependence of this susceptibility on the probe frequency for various given pump frequencies is calculated. Sub-Doppler structures in the selective reflection spectrum are obtained and analyzed. Potential applications to the study of the interaction of highly excited atomic states with the surface are indicated.
Special hole-burning effects on the spectrum of gas atoms near a glass–vapour interface were obtained by observing the reflection of a weak probe beam. Sub-Doppler reflection spectroscopy has been achieved and the unabsorption dip was measured for different pump laser power and detuning. The nonlinear optical properties of the atomic system were investigated by taking into account the collisions between the atoms and the walls of the cell. We also demonstrated the absorption reduction in a V-type energy level configuration with a linewidth of about 6.5 MHz. The experimental results agree with reasonable accuracy with the predictions derived from a theoretical explanation of the nonlinear optical susceptibility.