E Yu Morozov

Second optical harmonic generation in nonlinear crystals with a disordered domain structure

A theory describing the second harmonic generation in nonlinear-optical crystals with random domains is developed. The theory takes into account the fluctuations of both the phase mismatch and the nonlinear coupling coefficient of the interacting waves. It is shown that, in such crystals, the maximal efficiency of fundamental-to-second harmonic conversion is low, and the dependence of the average intensity of the second harmonic on the fundamental intensity differs considerably from a square law.

Consecutive parametric interactions of light waves with aliquant frequencies

The process of parametric amplification with low frequency pumping in the case of aliquant frequencies of interacting waves has been studied. It has been shown that this process can be realized in a periodically poled LiNbO3 crystal. It has been established that in periodically poled nonlinear crystals the regime of exponential changing intensity of interacting waves can be implemented. The highest possible conversion efficiency in the parametrically amplified wave reaches approximately 70%.

Simultaneous generation second and third harmonics in crystal with the modulated second-order nonlinearity

We present results of theoretical and experimental study of the consecutive third harmonic generation in a periodically poled bulk LiNbO/sub 3/:Y crystal. It is shown theoretically that under certain conditions for nonlinear coefficients the energy of wave with frequency /spl omega/ in the consecutive considered interaction can be almost completely converted to the energy of wave with frequency 3/spl omega/.