Benjamin Willenberg,1 Christopher R. Phillips,1 Justinas Pupeikis,1 Lars Liebermeister,2 Robert Kohlhaas,2 Björn Globisch,2 Ursula Kellerhttps://orcid.org/0000-0002-1689-80411
1ETH Zurich (Switzerland) 2Fraunhofer-Institut für Nachrichtentechnik, Heinrich-Hertz-Institut, HHI (Germany)
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We present THz-TDS with a low-noise single-cavity dual-comb GHz oscillator. This solid-state laser delivers two mutually coherent combs with 70-fs pulses, 1055-nm center wavelength, 110 mW per comb, and a repetition rate difference up to 100 kHz. In a proof of principle THz experiment, we direct the two combs onto two photoconductive antennae to efficiently generate and electrooptically sample the THz waveform. At a repetition rate difference of 37 kHz we achieve 40-dB dynamic range in a 2-s integration time for a spectral resolution of 2 GHz allowing to resolve absorption features up to 3 THz.
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Benjamin Willenberg, Christopher R. Phillips, Justinas Pupeikis, Lars Liebermeister, Robert Kohlhaas, Björn Globisch, Ursula Keller, "Rapid THz-TDS enabled by single-cavity solid-state GHz dual-comb oscillator," Proc. SPIE PC12420, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XVI, PC1242006 (13 March 2023); https://doi.org/10.1117/12.2650093