A new method of realization of coupled nonlinear optical interactions in single aperiodically poled nonlinear crystal is
studied. The simultaneous two and three coupled wave processes are investigated in detail.
The intracavity self-frequency conversion of laser radiation in active nonlinear crystal is studied. The spatial distributions of intensities and powers of laser radiation and radiation with conversed frequency are calculated by the method of numerical simulations as functions of parameters of cavity, active nonlinear crystal and pump. The analysis is performed for periodically poled Nd:Mg:LiNbO3 crystal taking diffraction into account.
We introduce the results of the study of quasi-phase matched processes of self-frequency conversion in periodically poled active nonlinear crystals. The processes of self-frequency doubling and self-frequency summing have been experimentally realized and studied in periodically poled Nd:Mg:LiNbO3 crystals in CW and Q-switched regimes. The theory of self-frequency conversion has developed. The results of theory are in good agreement with experiments.
We introduce the results of the study of intracavity quasi-phase-matched three-frequency wave interactions in active nonlinear periodically poled crystals. The process of self-frequency summing in periodically poled Nd:Mg:LiNbO3 has been studied. Quasi-phase-matched sum-frequency generation at 0.464 μm by self-frequency summing of fundamental radiation at 1.084 μm and unabsorbed part of pump radiation of diode laser at 0.810 μm in periodically poled Nd:Mg:LiNbO3 crystal has been realized experimentally.
We introduce the theory of intracavity quasi-phase-matched three-frequency wave interactions in active-nonlinear periodically poled medium, and in particular, self-frequency doubling and halving. The combination of laser oscillation of active ions with nonlinear optical properties of the host material provides an opportunity for creation laser with self- frequency conversion. Quasi-phase-matched second harmonic generation at 0.542 micrometer by self-frequency doubling of fundamental radiation laser radiation at 1.084 micrometer in periodically poled Nd:Mg:LiNbO3 crystal pumping by diode laser at 0.810 micrometer has been observed experimentally.
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