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The shortest wavelengths, generated by periodically-poled lithium niobate, are in the vicinity of 62.5 μm at the poling period of 7.1 μm. Large enhancements in the output powers from three gratings are demonstrated.
In this paper, we demonstrate that THz generation can be a sensitive technique for investigating violations of Kleinman's symmetry condition and spatial symmetry of second-order nonlinear susceptibility tensor for GaSe.
We have observed unique polarization and azimuth-angle characteristics of THz waves, generated from anisotropic monoclinic GaTe when pump photon energy is below and above its bandgap, due to carrier unidirectional diffusion.
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