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We report on the experimental investigation of the efficiency of somenonlinear crystals to generate microwave (RF) radiation as a result of opticalrectification (OR) when irradiated with intense pulse trains delivered by amode-locked laser at $1064\,$nm. We have investigated lithium triborate (LBO),lithium niobate (LiNbO$_3$), zinc selenide (ZnSe), and also potassium titanylorthophosphate (KTP) for comparison with previous measurements. The results arein good agreement with the theoretical predictions based on the form of thesecond-order nonlinear susceptibility tensor. For some crystals we investigatedalso the second harmonic generation (SHG) to cross check the theoretical model.We confirm the theoretical prediction that OR leads to the production of higherorder RF harmonics that are overtones of the laser repetition rate.

Microwave emission by nonlinear crystals irradiated with a high-intensity, mode-locked laser