Double Fourier spatio-spectral interferometry - Combining high spectral and high spatial resolution in the near infrared

Details Double Fourier spatio-spectral interferometry - Combining high spectral and high spatial resolution in the near infrared Double Fourier spatio-spectral interferometry - Combining high spectral and high spatial resolution in the near infrared

Apr 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...195..350m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 195, no. 1-2, April 1988, p. 350-363.

Astronomy and Astrophysics

Astronomy

40

Fourier Analysis, Infrared Interferometers, Spatial Resolution, Spectral Resolution, Absorption Spectra, Angular Resolution, Diffraction Limited Cameras, Infrared Sources (Astronomy), Molecular Spectra

Scientific paper

The authors present a new method to combine high angular with high spectral resolution interferometry. The fundamental characteristic of this method is that it is sequential in spatial frequency space and multiplexed in spectrum space. Hence, it combines the multiplex advantage of the Fourier Transform Spectrometry (when detector noise is dominant) with the non-redundancy advantage of pupil plane interferometry, that is, independence of the spatial transfer function from the seeing. The principle can be applied to single pupil interferometry, especially if coupled with detector mosaics, and to arrays of two or more telescopes. In this context, the natural preservation of the spectral phase gradient is very interesting. As for differential speckle interferometry, it should provide super-resolution in the spatial domain, and a possibility of estimating the object phase, leading to diffraction limited imaging.

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