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Publication type: Article in scientific journal
Type of review: Peer review (publication)
Title: MHz-repetition-rate, sub-mW, multi-octave THz wave generation in HMQ-TMS
Authors: Buchmann, Tobias Olaf
Kelleher, Edmund J. R.
Kaltenecker, Korbinian J.
Zhou, Binbin
Lee, Seung-Heon
Kwon, O-Pil
Jazbinsek, Mojca
Rotermund, Fabian
Jepsen, Peter Uhd
et. al: No
DOI: 10.1364/OE.386604
Published in: Optics Express
Volume(Issue): 28
Issue: 7
Pages: 9631
Pages to: 9641
Issue Date: 19-Mar-2020
Publisher / Ed. Institution: Optical Society of America
ISSN: 1094-4087
Language: English
Subjects: THz Photonics
Subject (DDC): 540: Chemistry
621.3: Electrical, communications, control engineering
Abstract: We demonstrate the first megahertz (MHz) repetition-rate, broadband terahertz (THz) source based on optical rectification in the organic crystal HMQ-TMS driven by a femtosecond Yb:fibre laser. Pumping at 1035 nm with 30 fs pulses, we achieve few-cycle THz emission with a smooth multi-octave spectrum that extends up to 6 THz at -30 dB, with conversion efficiencies reaching 10-4 and an average output power of up to 0.38 mW. We assess the thermal damage limit of the crystal and conclude a maximum fluence of ∼1.8 mJ·cm-2 at 10 MHz with a 1/e2 pump beam diameter of 0.10 mm. We compare the performance of HMQ-TMS with the prototypical inorganic crystal gallium phosphide (GaP), yielding a tenfold electric field increase with a peak on-axis field strength of 7 kV·cm-1 and almost double the THz bandwidth. Our results further demonstrate the suitability of organic crystals in combination with fibre lasers for repetition-rate scaling of broadband, high-power THz sources for time-domain spectroscopic applications.
Fulltext version: Published version
License (according to publishing contract): Licence according to publishing contract
Departement: School of Engineering
Organisational Unit: Institute of Computational Physics (ICP)
Appears in collections:Publikationen School of Engineering

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