High-resolution electro-optically sampled broadband dual-comb spectroscopy across mid-IR to terahertz at video rate

Ultrabroadband electro-optic sampling with few-cycle optical pulses is known to be an extremely sensitive technique to detect electric field amplitudes. By combining this method with dual-comb spectroscopy and with a new class of ultrafast lasers, we perform high-resolution (200,000 comb-mode spectral lines) at up to a video rate of 69 Hz and with the high dynamic range limited by the shot noise of the near-IR EOS balanced detection. Our long-wavelength IR measurements with low-pressure gases: ethanol, isoprene, and dimethyl sulfide reveal spectroscopic features that had never been explored before.