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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)...
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.
We show that transverse-pumping geometry can be exploited for THz generation when a second-order nonlinear medium is highly lossy at its polariton resonance. High conversion efficiencies can be achieved via such a novel configuration.
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