Abstract

The influence of spatial limitation femtosecond laser pulse as both on generation efficiency of difference frequency radiation by an optical rectification in periodically-poled <i>GaAs</i> crystal, and on a space-time profile of generated radiation in near and far zones is investigated. The difference frequency radiation features generated by spatially-limited femtosecond laser pulse with Gaussian spatial profile of intensity and the amplitude front in periodically-poled GaAs crystal are considered. As a result of Fresnel transformation application, an expression for the frequency-angular spectrum and the spectral density of difference frequency radiation in the far field is obtained. It is shown that generating the difference frequency radiation via optical rectification of spatially-limited femtosecond laser pulse in cross-section distribution of difference frequency radiation near field a certain coordinate corresponds to the appropriate spectral component.

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