Precision multiplex molecular fingerprinting with femtosecond frequency combs.

In this contribution, we report on frequency comb Fourier transform molecular spectra retrieved from a highly versatile and compact experimental scheme that allows extremely high resolution, fast acquisition times and high accuracy. Fourier spectra, comprising 500,000,000 spectral elements spanning 1 nm with 2.3 kHz resolution, are recorded within 6 s. Moving mirror of equivalent interferometers should cover 130 km path-difference excursion at 10 km.s^-1 velocity. Interleaved procedure enhances the effective resolution to a formal limit only due to the combs linewidth. Accurate molecular spectroscopy is reported on the overtone spectrum of acetylene in the near- infrared region. The intriguing perspectives envisioned for our technique for multiplex accessing of self-calibrated spectra with negligible instrumental lineshape are discussed.