Frequency chirped Fourier-Transform spectroscopy

Abstract Fast (sub-second) spectroscopy with high spectral resolution is of vital importance for revealing quantum chemistry kinetics complex chemical and biological reactions. Fourier transform (FT) spectrometers can achieve operate at hundreds ms time scales in rapid-scan mode. However, the linear translation a scanning mirror imposes stringent time-resolution limitations to these systems, which makes simultaneous temporal very difficult. Here, we demonstrate an FT spectrometer whose operational principle based on continuous rotational motion mirror, effectively decoupling from one. Furthermore, show that such perform Mid-IR dual-comb single comb source, since Doppler-shifted version serves as second comb. In our realization, combine advantages using cascade laser frequency emitting 8.2 μm light source. Our technique does not require any diffractive or dispersive optical elements hence preserve Jacquinot’s-, Fellgett’s-, Connes’-advantages spectrometers. By integrating mulitple broadband sources, system could pave way applications where speed, large bandwidth, are desired.