Physics – Optics
Scientific paper
Nov 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005josaa..22.2454c&link_type=abstract
Optical Society of America Journal, Volume 22, Issue 11, pp. 2454-2464 (2005).
Physics
Optics
1
Mirrors, Geometrical Optics, Aberrations, Astronomical Telescopes, Aberration Theory, Telescopes, Astronomical Optics
Scientific paper
A geometrical theory of aberrations for the vicinity of the focus of arbitrary off-axis sections of conic mirrors is derived. It is shown that an off-axis conic mirror introduces linear astigmatism in the image. However, in classical two-mirror telescopes this aberration can be eliminated by tilting the secondary parent mirror axis. It is also shown that the practical geometrical-optics performance of a classical off-axis two-mirror telescope with no linear astigmatism is equivalent to the performance of an on-axis system, proving that both systems have identical third-order coma. To demonstrate the applicability of the theory developed in a practical system, a fast (i.e., f-2), compact, obstruction-free classical off-axis Cassegrain telescope is designed.
Chang Seunghyuk
Prata Aluizio
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