THz time-domain spectroscopy with gigahertz Yb-based single-cavity dual-comb lasers

Dual-comb laser sources are of high interest for many scientific and industrial applications. The presentation will highlight the latest advances in high performance single-cavity dual-comb modelocking. Operating these sources at GHz repetition rates make them particularly suited for high resolution and high update rate spectroscopy measurements. Here, we apply a gigahertz single-cavity dual-comb laser with 77fs pulses at 1.05µm center wavelength to THz time-domain spectroscopy by driving Fe-doped photoconductive antennas. The laser’s ultra-low-noise properties enable averaging of the THz waveform for repetition rate differences from 1kHz to 22kHz, resulting in a dynamic range of up to 55dB for 2s integration.