Abstract

A femtosecond mode-locked laser is used for what is believed to be the first time as a broadband infrared source for high-resolution Fourier transform absorption spectroscopy. A demonstration is made with a Cr4+:YAG laser. The entire ν1+ν3 vibration–rotation band region of acetylene, observed after passing through a single-pass 80-cm-long cell, is simultaneously recorded between 1480 and 1600nm, in 7.9s with a signal-to-noise ratio equal to 1000. Two hot bands of the most abundant acetylene isotopologue and the ν1+ν3 band of the C1213CH2 are also present. Replacement of the usual conventional tungsten lamp by the bright laser source reduces by about a factor of 150 the recording time needed to get similar results. The noise equivalent absorption coefficient at 1s averaging is equal to 7×107cm1Hz12 per spectral element.

© 2007 Optical Society of America

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