Physics – Optics
Scientific paper
Sep 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989opten..28.1014r&link_type=abstract
Optical Engineering (ISSN 0091-3286), vol. 28, Sept. 1989, p. 1014-1018.
Physics
Optics
3
Cassegrain Optics, Geometrical Optics, Lens Design, Telescopes, Zoom Lenses, Mirrors, Numerical Analysis
Scientific paper
A method of aplanatic zooming of a four-spherical-mirror system by use of the third order aberration theory is developed. Among the three types of aplanatic systems theoretically possible, only the Cassegrainian-Cassegrainian type is suitable for a practical zoom system. The aberrations of the zoom system are minimized to the extent that it shows nearly diffraction limited performance at the wavelength of 10.6 microns in the focal length range of 60 to 140 cm and the f-number range f/4.0 to f/8.0 for a half-field angle of 1 degree due to astigmatism. An attempt to reduce the astigmatism of the four-spherical-mirror zoom system is currently in progress. It is found that a conic surface, such as an ellipsoid, for the primary surface of the four-mirror zoom system developed from an anastigmatic initial design is effective in reducing the astigmatism throughout the zooming range.
Lee Sang Soo
Rah Seung Yu
No associations
LandOfFree
Four-spherical-mirror zoom telescope continuously satisfying the aplanatic condition does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Four-spherical-mirror zoom telescope continuously satisfying the aplanatic condition, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Four-spherical-mirror zoom telescope continuously satisfying the aplanatic condition will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-766530