Waveguided Approach for Difference Frequency Generation of Broadly-Tunable Terahertz Radiation

The spectral features of stabilized telecom sources can be transferred to the THz range by difference frequency generation. In this paper we extensively discuss the role of Lithium Niobate (LN) channel-waveguides in the experimental accomplishment of a room-temperature continuous wave (CW) spectrometer, with μW-range power levels and a spectral coverage of up to 7.5 THz. To this purpose, and looking for further improvements, a thought characterization of specially-designed LN waveguides is presented, whilst discussing its nonlinear efficiency and its unprecedented capability to handle high optical power on the basis of a three-wave-mixing theoretical model.

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