Waveguided approach for difference frequency generation of broadly-tunable continuous-wave terahertz radiation

Year: 2018

Authors: De Regis M., Consolino L., Bartalini S., De Natale P.

Autors Affiliation: INO, CNR, Largo E Fermi 6, I-50125 Florence, Italy; LENS, European Lab Nonlinear Spect, Via N Carrara 1, I-50019 Fiorentino, Italy.

Abstract: The 1-10 terahertz (THz) spectralwindowis emerging as a key region for plenty of applications, requiring not yet available continuous-wave room-temperature THz spectrometers with high spectral purity and ultra-broad tunability. In this regard, the spectral features of stabilized telecom sources can actually be transferred to the THz range by difference frequency generation, considering that the width of the accessible THz spectrum generally scales with the area involved in the nonlinear interaction. For this reason, 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 (107 W/cm2), on the basis of a three-wave-mixing theoretical model.

Journal/Review: APPLIED SCIENCES-BASEL

Volume: 8 (12)      Pages from: 2374-1  to: 2374-13

More Information: Authors would like to acknowledge support from: European Union FET-Open grant 665158 Ultrashort Pulse Generation from Terahertz Quantum Cascade Lasers-ULTRAQCL Project; European ESFRI Roadmap Extreme Light Infrastructure-ELI Project; European Commission-H2020 Laserlab-Europe, EC grant agreement number: 654148.
KeyWords: waveguide; nonlinear optics; terahertz sources
DOI: 10.3390/app8122374

Citations: 18
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