MHz-repetition-rate, sub-mW, multi-octave THz wave generation in HMQ-TMS

Tobias Olaf Buchmann, Edmund J.R. Kelleher, Korbinian J. Kaltenecker, Binbin Zhou, Seung Heon Lee, O. Pil Kwon, Mojca Jazbinsek, Fabian Rotermund, Peter Uhd Jepsen

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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.

Original languageEnglish
JournalOptics Express
Issue number7
Pages (from-to)9631-9641
Publication statusPublished - 30 Mar 2020


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