Waveguided approach for difference frequency generation of broadly-tunable continuous-wave terahertz radiation
Authors: De Regis M., Consolino L., Bartalini S., De Natale P.
Autors Affiliation: INO, Istituto Nazionale di Ottica-CNR, Largo E. Fermi 6, Firenze, I-50125, Italy; LENS, European Laboratory for Nonlinear Spectroscopy, Via N. Carrara 1, Sesto, Fiorentino, I-50019, 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: Nonlinear optics; Terahertz sources; WaveguideDOI: 10.3390/app8122374Citations: 10data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2021-10-10References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here