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Publication type: Article in scientific journal
Type of review: Peer review (publication)
Title: High-power few-cycle THz generation at MHz repetition rates in an organic crystal
Authors: Buchmann, Tobias Olaf
Railton Kelleher, Edmund John
Jazbinsek, Mojca
Zhou, Binbin
Seok, Jin-Hong
Kwon, O-Pil
Rotermund, Fabian
Jepsen, Peter Uhd
et. al: No
DOI: 10.1063/5.0022762
Published in: APL Photonics
Volume(Issue): 5
Issue: 10
Pages: 106103
Issue Date: 2020
Publisher / Ed. Institution: AIP Publishing
ISSN: 2378-0967
Language: English
Subjects: THz photonics
Subject (DDC): 540: Chemistry
621.3: Electrical, communications, control engineering
Abstract: Ultrafast terahertz (THz) spectroscopy is a potent tool for studying the fundamental properties of matter. Limitations of current THz sources, however, preclude the technique being applied in certain advanced configurations or in the measurement of, e.g., strongly absorbing samples. In response to this problem, here we demonstrate the generation of 1.38 mW broadband THz radiation at 10 MHz repetition rate by combining the highly efficient nonlinear organic crystal HMQ-TMS with ultrafast pump pulses generated using a simple and stable external pulse compression of a high power, near-infrared (NIR) femtosecond ytterbium-doped fiber (Yb:fiber) laser. Utilizing spectral broadening in a large core, polarization maintaining photonic crystal fiber and a pair of SF11 prisms, we achieve a tenfold pulse compression of the Yb:fiber laser, yielding compressed 0.35 µJ pulses with a full-width at half maximum pulse duration of 22 fs, exerting a peak power of 13.8 MW at a repetition rate of 10 MHz. THz generation through optical rectification of the NIR pulses is explored in two distinct thicknesses of the organic crystal, leading to a maximum conversion efficiency of ∼5.5 · 10−4, an order of magnitude higher than that achieved with inorganic nonlinear crystals, e.g., gallium phosphide, for similar pump parameters. The focused THz beam has a peak on-axis field strength greater than 6.4 kV cm−1 in unpurged atmosphere. We believe that our moderately strong-field THz source is well suited to a variety of applications in ultrafast THz spectroscopy, in particular THz-enabled scattering-type near-field, and scanning tunneling spectroscopy, where multi-MHz repetition rate sources are required.
Fulltext version: Published version
License (according to publishing contract): CC BY 4.0: Attribution 4.0 International
Departement: School of Engineering
Organisational Unit: Institute of Computational Physics (ICP)
Appears in collections:Publikationen School of Engineering

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