title: Improved mid infrared detector for high spectral or spatial resolution and synchrotron radiation use.
abstract: When using bright, small effective size sources, such as synchrotron radiation light beam, for broadband spectroscopy at spectral or spatial high resolution for mid-IR FTIR measurements, a marked detectivity improvement can be achieved by setting up a device matching the detector optical étendue to that of the source. Further improvement can be achieved by reducing the background unmodulated flux and other intrinsic noise sources using a lower temperature cryogen, such as liquid helium. By the combined use of cooled apertures, cold reimaging optics, filters and adapted detector polarization, and preamplification electronics, the sensitivity of a HgCdTe photoconductive IR detector can be improved by a significant factor with respect to standard commercial devices (more than one order of magnitude on average over 6-20 μm region) and the usable spectral range extended to longer wavelengths. The performances of such an optimized detector developed on the AILES Beamline at SOLEIL are presented here.
authors.affiliation: Synchrotron SOLEIL, L'Orme des Merisiers, F-91192 Gif-sur-Yvette, France.
authors.forename: Mbaye
authors.initials: M
authors.lastname: Faye
authors.affiliation: Synchrotron SOLEIL, L'Orme des Merisiers, F-91192 Gif-sur-Yvette, France.
authors.forename: Michel
authors.initials: M
authors.lastname: Bordessoule
authors.affiliation: Synchrotron SOLEIL, L'Orme des Merisiers, F-91192 Gif-sur-Yvette, France.
authors.forename: Brahim
authors.initials: B
authors.lastname: Kanouté
authors.affiliation: Synchrotron SOLEIL, L'Orme des Merisiers, F-91192 Gif-sur-Yvette, France.
authors.forename: Jean-Blaise
authors.initials: JB
authors.lastname: Brubach
authors.affiliation: Synchrotron SOLEIL, L'Orme des Merisiers, F-91192 Gif-sur-Yvette, France.
authors.forename: Pascale
authors.initials: P
authors.lastname: Roy
authors.affiliation: Synchrotron SOLEIL, L'Orme des Merisiers, F-91192 Gif-sur-Yvette, France.
authors.forename: Laurent
authors.initials: L
authors.lastname: Manceron