High-power few-cycle THz generation at MHz repetition rates in an organic crystal

Buchmann, Tobias Olaf; Railton Kelleher, Edmund John; Jazbinsek, Mojca; Zhou, Binbin; Seok, Jin-Hong; Kwon, O-Pil; Rotermund, Fabian; Jepsen, Peter Uhd

doi:10.1063/5.0022762

Please use this identifier to cite or link to this item: https://doi.org/10.21256/zhaw-21559

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 10.21256/zhaw-21559
Published in:	APL Photonics
Volume(Issue):	5
Issue:	10
Page(s):	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.
URI:	https://digitalcollection.zhaw.ch/handle/11475/21559
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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Buchmann, T. O., Railton Kelleher, E. J., Jazbinsek, M., Zhou, B., Seok, J.-H., Kwon, O.-P., Rotermund, F., & Jepsen, P. U. (2020). High-power few-cycle THz generation at MHz repetition rates in an organic crystal. APL Photonics, 5(10), 106103. https://doi.org/10.1063/5.0022762

Buchmann, T.O. et al. (2020) ‘High-power few-cycle THz generation at MHz repetition rates in an organic crystal’, APL Photonics, 5(10), p. 106103. Available at: https://doi.org/10.1063/5.0022762.

T. O. Buchmann et al., “High-power few-cycle THz generation at MHz repetition rates in an organic crystal,” APL Photonics, vol. 5, no. 10, p. 106103, 2020, doi: 10.1063/5.0022762.

BUCHMANN, Tobias Olaf, Edmund John RAILTON KELLEHER, Mojca JAZBINSEK, Binbin ZHOU, Jin-Hong SEOK, O-Pil KWON, Fabian ROTERMUND und Peter Uhd JEPSEN, 2020. High-power few-cycle THz generation at MHz repetition rates in an organic crystal. APL Photonics. 2020. Bd. 5, Nr. 10, S. 106103. DOI 10.1063/5.0022762

Buchmann, Tobias Olaf, Edmund John Railton Kelleher, Mojca Jazbinsek, Binbin Zhou, Jin-Hong Seok, O-Pil Kwon, Fabian Rotermund, and Peter Uhd Jepsen. 2020. “High-Power Few-Cycle THz Generation at MHz Repetition Rates in an Organic Crystal.” APL Photonics 5 (10): 106103. https://doi.org/10.1063/5.0022762.

Buchmann, Tobias Olaf, et al. “High-Power Few-Cycle THz Generation at MHz Repetition Rates in an Organic Crystal.” APL Photonics, vol. 5, no. 10, 2020, p. 106103, https://doi.org/10.1063/5.0022762.