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Highly efficient THz generation by optical rectification of mid-IR pulses in DAST

Gollner, Claudia; Shalaby, Mostafa; Brodeur, Corinne; Astrauskas, Ignas; Jutas, Rokas 1; Constable, Evan; Bergen, Lorenz; Baltuška, Andrius; Pugžlys, Audrius
1 Institut für Regelungs- und Steuerungssysteme (IRS), Karlsruher Institut für Technologie (KIT)

Abstract:
We report on efficient THz generation in DAST by optical rectification of intense mid-IR pulses centered at (i) 3.9 μm and (ii) its second harmonic at 1.95 μm. Suppression of multi-photon absorption shifts the onset of saturation of the THz conversion efficiency to pump energy densities, which are almost an order of magnitude higher as compared to conventional pump schemes at 1.5 μm. Despite strong linear absorption at 3.9 μm, DAST exhibits a high optical-to-THz conversion efficiency, which we attribute to resonantly enhanced nonlinearity and advantageous phase matching of the THz phase velocity and group velocity of the driving pulse. At 1.95 μm, we find that low linear and multi-photon absorption in combination with cascaded optical rectification lead to record optical-to-THz conversion efficiencies approaching 6%. The observed high sensitivity of the THz generation to the parameters of the mid-IR driving pulses motivates an in-depth study of the underlying interplay of nonlinear wavelength- and intensity-dependent effects.


Verlagsausgabe §
DOI: 10.5445/IR/1000132359
Veröffentlicht am 06.05.2021
Originalveröffentlichung
DOI: 10.1063/5.0037235
Scopus
Zitationen: 5
Web of Science
Zitationen: 4
Dimensions
Zitationen: 6
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Regelungs- und Steuerungssysteme (IRS)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 2378-0967
KITopen-ID: 1000132359
Erschienen in APL Photonics
Verlag American Institute of Physics (AIP)
Band 6
Heft 4
Seiten Art.-Nr.: 046105
Nachgewiesen in Dimensions
Scopus
Web of Science
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