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A phonon peak at 127 cm−1 due to nonlinear mixing of two transverse-optical phonon frequencies through anharmonicity of LiTaO3 is used to explain enhancements of effective second-order nonlinear coefficients by factors of up to 3.7.
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.
InGaN/GaN dot-in-a-wire nanostructure grown on Si(111) is extremely efficient for terahertz generation. The highest output power is measured to be 300 nW just from ten vertically stacked quantum dots in each quantum wire.
Narrowband terahertz pulses are generated by periodically-poled stoichiometric lithium tantalate with average output powers of 100 μW based on backward optical rectification, which is scalable to at least 10 mW.
We have generated broadband THz pulses within eight periods of InGaN/GaN quantum wells due to dipole radiation following generation of spatially-separated electrons and holes. Output powers as high as 1 μW have been obtained.
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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