Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...274..983l&link_type=abstract
Astronomy and Astrophysics, Vol. 274, p. 983 (1993)
Astronomy and Astrophysics
Astrophysics
3
Instrumentation: Miscellaneous, Telescopes
Scientific paper
Fixed telescopes are considerably less expensive than tiltable ones but can only access a limited region of the sky. To extend their field of view, we have investigated the use of holographic elements. We have used the scalar approximation to compute holographic correctors for a 4-m diameter f/4 parabolic primary mirror. We identify a few critical areas of research. The computation of the reference wave needed for our holographic correctors is presently limited by computing power, because of the large parameters of the mirror at optical wavelengths. Our computations show that it is possible to achieve an excellent correction with a single CGH for monochromatic light at the recording wavelength. We obtained a very satisfactory correction over a 100 Å bandpass. Although a corrector effective only over 100 Å can be used for some astronomical research, the chromaticism of a single hologram is a major limitation for the use of CGH correctors in astronomy. With this limited bandpass, we can construct a mosaic hologram that will extend the field of view of the entire holographic corrector. Fortunately, it should be possible to increase the achromaticity of a CGH by adding additional optical elements (holograms, lenses, prisms).
Borra Ermanno F.
Lemelin Guylain
Lessard Roger A.
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