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Updated: Jun 14, 2026

Implementation of a Reference Interferometer for Nanodetection
Published on: April 26, 2014
Differential Fourier spectroscopy with simultaneous interferograms: application to extensive accurate pressure-shift
Abstract:
A new method is described, allowing cancellation of systematic effects in the comparison between different spectra recorded with a general purpose high-information Fourier spectrometer. Preliminary tests on pressure-shift measurements of the 1-0 vibration-rotation band of CO at 5 microm demonstrate improvement in the sensitivity and the precision of two orders of magnitude. With a SNR of ~200, no evidence of systematic shifts due to the method itself exists over 10(-6) cm(-1) (30 KHz). (This corresponds, for example, to an astronomical radial velocity of 0.15 msec(-1).) Wave number pressure shifts due to 5 Torr of CO are easily detectable. The 50 analyzed lines of the CO band belong to 300,000 spectral elements recorded in spectra covering 1000 cm(-1). This clearly indicates that accurate pressure-shift measurements of very extensive spectra become possible. The method has also all the known advantages of differential spectroscopy performed here for the first time with Doppler-limited resolution.
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