Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jopt...11..149r&link_type=abstract
Journal of Optics, vol. 11, May-June 1980, p. 149-152. Research supported by the Centre National de la Recherche Scientifique.
Astronomy and Astrophysics
Astronomy
10
Astronomy, Holographic Interferometry, Lens Design, White Light Holography, Blurring, Data Recording, Diffraction Patterns, Image Processing, Image Reconstruction, Incoherence, Magnification, Spectral Line Width
Scientific paper
The bandwidth limitation to incoherent twin-image holography is examined, and a solution to the problem for the reconstruction and recording of turbulence- or aberration-degraded astronomical images is presented. The maximum usable bandwidth to prevent chromatic blurring is shown to vary inversely with the total number of pixels in the reconstructed image; however, it is noted that the use of very short exposures in the restoration of turbulence-degraded images favors an increase in bandwidth. Previously designed achromatic interferometers are indicated, and it is pointed out that the chromatic effect in the hologram irradiance distribution disappears if an image is produced in front of the interferometer with a magnification proportional to the wavelength, as in rotation shearing interferometry. A chromatic lens system based on two meniscus lenses providing a chromatic change in magnification is outlined, and experimental results obtained with the system and demonstrating the utility of the system in increasing fringe numbers are presented.
Baranne Andre
Brun Rene
Martin Francisco
Roddier Claude
Roddier Francois
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