000402724 001__ 402724 000402724 005__ 20250717101438.0 000402724 0247_ $$2doi$$a10.1364/OE.26.012536 000402724 0247_ $$2datacite_doi$$a10.3204/PUBDB-2018-01885 000402724 0247_ $$2pmid$$apmid:29801292 000402724 0247_ $$2WOS$$aWOS:000432457600039 000402724 0247_ $$2openalex$$aopenalex:W2801844006 000402724 037__ $$aPUBDB-2018-01885 000402724 041__ $$aEnglish 000402724 082__ $$a530 000402724 1001_ $$0P:(DE-H253)PIP1023642$$aHemmer, Michael$$b0$$eCorresponding author$$udesy 000402724 245__ $$aCascaded Interactions Mediated by terahertz radiation 000402724 260__ $$aWashington, DC$$bOSA$$c2018 000402724 3367_ $$2DRIVER$$aarticle 000402724 3367_ $$2DataCite$$aOutput Types/Journal article 000402724 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article$$bjournal$$mjournal$$s1525350210_16473 000402724 3367_ $$2BibTeX$$aARTICLE 000402724 3367_ $$2ORCID$$aJOURNAL_ARTICLE 000402724 3367_ $$00$$2EndNote$$aJournal Article 000402724 520__ $$aWe investigate a regime of parametric amplification in which the pump and signal waves are spectrally separated by only a few hundreds of GHz frequency – therefore resulting in a sub-THz frequency idler wave. Operating in this regime we find an optical parametric amplifier (OPA) behavior which is highly dissimilar to conventional OPAs. In this regime, we observe multiple three-wave mixing processes occurring simultaneously which results in spectral cascading around the pump and signal wave. Via numerical simulations, we elucidate the processes at work and show that cascaded optical parametric amplification offers a pathway toward THz-wave generation beyond the Manly-Rowe limit and toward the generation of high-energy, sparse frequency-combs. 000402724 536__ $$0G:(DE-HGF)POF3-6211$$a6211 - Extreme States of Matter: From Cold Ions to Hot Plasmas (POF3-621)$$cPOF3-621$$fPOF III$$x0 000402724 536__ $$0G:(EU-Grant)609920$$aAXSIS - Frontiers in Attosecond X-ray Science: Imaging and Spectroscopy (609920)$$c609920$$fERC-2013-SyG$$x1 000402724 536__ $$0G:(GEPRIS)194651731$$aCUI - Hamburger Zentrum für ultraschnelle Beobachtung (194651731)$$c194651731$$x2 000402724 588__ $$aDataset connected to CrossRef 000402724 693__ $$0EXP:(DE-H253)CFEL-Exp-20150101$$5EXP:(DE-H253)CFEL-Exp-20150101$$eExperiments at CFEL$$x0 000402724 7001_ $$0P:(DE-H253)PIP1015912$$aCirmi, G.$$b1$$udesy 000402724 7001_ $$0P:(DE-H253)PIP1019059$$aRavi, K.$$b2 000402724 7001_ $$0P:(DE-H253)PIP1007643$$aReichert, Fabian$$b3 000402724 7001_ $$0P:(DE-H253)PIP1019231$$aAhr, Frederike$$b4 000402724 7001_ $$0P:(DE-H253)PIP1017820$$aZapata, L.$$b5 000402724 7001_ $$0P:(DE-H253)PIP1014908$$aMücke, O. 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