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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 have observed frequency upconversion of the incoming photons within the communication band to a visible band in a gallium phosphide crystal. Such a crystal is capable of reaching the single-photon detection level.
Terahertz output peak power as high as 2.7 kW is achieved by difference-frequency generation. Conversion efficiency reaching maximum value of 40% is obtained by reversely stacking four GaP plates.
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