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We report measurements of microwave (RF) generation in the centimeter bandaccomplished by irradiating a nonlinear KTiOPO$_4$ (KTP) crystal with ahome-made, infrared laser at $1064\,$nm as a result of optical rectification(OR). The laser delivers pulse trains of duration up to $1\,\mu$s. Each trainconsists of several high-intensity pulses at an adjustable repetition rate ofapproximately $ 4.6\,$GHz. The duration of the generated RF pulses isdetermined by that of the pulse trains. We have investigated both microwave-and second harmonic (SHG) generation as a function of the laser intensity andof the orientation of the laser polarization with respect to thecrystallographic axes of KTP.

Generation of microwave radiation by nonlinear interaction of a high-power, high-repetition rate, 1064-nm laser in KTP crystals