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Phonon-polariton resonances are manifestation of the strong interaction between an electromagnetic wave interacts and transverse-optical phonons in a crystalline solid. Such resonances result in great enhancements of ionic second-order nonlinearities [1]. For LiNbO3, dominant element of the ionic second-order nonlinear susceptibility tensor coefficients d33 at 7.5 THz is a factor of about 50 larger...
We have observed enhancement factors of at least 21 for backward-propagating anti-Stokes Raman signals generated by Ti-diffused lithium niobate waveguides under the microwatt pump power and using a single-photon detector.
Transversely-propagating THz radiation can be up-converted to an optical wave propagating in the waveguide. Complete photon conversion and single-photon detection can be reached.
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.
We have implemented a single-photon detector in the 1500-nm band based on frequency up-conversion in a MgO-doped periodically-poled LiNbO3 waveguide, with a record-low dark count rate and a record-low detectable signal photon rate.
We demonstrate efficient generation of far-infrared radiation at the center wavelength of 20.8 μm in lithium niobate in the vicinity of one of the polariton resonances.
In the near-IR and mid-IR regions, periodically-poled LiNbO3 (PPLN) has become an extremely efficient nonlinear medium. However, since long-wavelength cutoff for LiNbO3 is 5.5 µm, the longest wavelength ever generated from such a crystal is 6.8 µm [1]. Such a limit is caused by the strong polariton resonances due to the coupling of transverse-optical phonons with electromagnetic waves, see Fig. 1(a)...
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.
By coupling two counter-propagating fundamental beams into a LiNbO3 channel waveguide, we have generated a strong surface-emitting second-harmonic beam, with normalized conversion efficiency being enhanced by seven orders of magnitude.
Transverse-pumping geometry can be utilized for efficient generation of far-infrared radiation in 13–30 μm based on difference-frequency generation in periodically-poled LiNbO3 at its polariton resonances. High conversion efficiencies are achievable.
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