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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 shown that Raman oscillation, frequency upconversion, and Raman amplification can be achieved in a second-order nonlinear medium at the phonon-polariton resonance.
When adhesive free bonded (AFB) periodically-inverted potassium titanyl phosphate (KTiOPO4, KTP) plates were used as a nonlinear medium inside a cavity, coupled optical parametric oscillators (OPOs) were implemented [1]. As a result, two signal waves and two idler waves can be simultaneously generated. In singly resonant OPOs, two idler waves were used to efficiently generate THz waves [2]. When a...
THz radiation was generated by mixing idler-idler waves from coupled optical parametric oscillators based on stacked KTP plates. Power enhancement, noise reduction, and linewidth narrowing have been attributed to noise reduction between idler waves.
We investigated multiple coupled optical parametric oscillators, exhibiting behaviors of strong coupling. Conversion efficiency and slope efficiency stay the same as those for conventional and two coupled optical parametric oscillators whereas linewidths are significantly reduced.
We have implemented a THz source based on intracavity difference frequency generation in stacked GaP plates as an output coupler of an optical parametric oscillator. The total THz output peak power approaches 200 W.
By mixing three optical frequencies generated by an optical parametric oscillator under a novel configuration based in nonlinear crystals, multiple THz frequencies are efficiently generated. They can be used to pursue variety of novel applications.
Based on adhesive-free-bonded periodically inverted KTiOPO4 plates, we implemented a singly-resonant optical parametric oscillator, which has superior advantages of compensating walk-off and oscillating dual-signal wavelengths based on QPM.
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