Reconstructing fringes for cavity-vibration experiments in FTIR spectrometers

Rabi splittings are now being routinely measured for condensed phase vibrations interacting with the modes of a parallel plate etalon of wavelength-scale spacing by means of Fourier Transform Infrared (FTIR) spectrometers. Considering that the width of an etalon fringe is a critical parameter in experiments of cavity-vibration interactions, it is noteworthy that the fringes are strongly affected by non-ideal conditions such as the angular spread of the FTIR beam and/or etalon misalignment. This work characterizes how parallel plate etalons are affected by angular spread in our FTIR and presents a method to reconstruct fringes that are strongly affected by vibrations by using those unaffected by strong vibrations.

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