TY - JOUR
T1 - Four-mirror flat-field anastigmat aplanat telescopes with simple closed-form solutions
AU - Govindan, Rajesh
N1 - Publisher Copyright:
© 2018 Optical Society of America.
PY - 2018/5/1
Y1 - 2018/5/1
N2 - A four-mirror anastigmat aplanat telescope can be constructed using a Gregorian-form Mersenne afocal telescope as a feeder for a concentric spherical Schwarzschild objective. A flat image field can be obtained by adjusting the ratio of the radii of the mirrors. With the tertiary at the image of the aperture stop (the primary) the primary's conic K-1 can be varied, using the tertiary's conic K-3 to cancel the primary's spherical aberration without affecting the system's coma or astigmatism. For a spherical primary, the tertiary is an oblate ellipsoid (K-3 > 0). The minimum obscuration ratio is 44.7% (20% by area). (C) 2018 Optical Society of America.
AB - A four-mirror anastigmat aplanat telescope can be constructed using a Gregorian-form Mersenne afocal telescope as a feeder for a concentric spherical Schwarzschild objective. A flat image field can be obtained by adjusting the ratio of the radii of the mirrors. With the tertiary at the image of the aperture stop (the primary) the primary's conic K-1 can be varied, using the tertiary's conic K-3 to cancel the primary's spherical aberration without affecting the system's coma or astigmatism. For a spherical primary, the tertiary is an oblate ellipsoid (K-3 > 0). The minimum obscuration ratio is 44.7% (20% by area). (C) 2018 Optical Society of America.
KW - System
UR - https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=hbku_researchportal&SrcAuth=WosAPI&KeyUT=WOS:000431228000010&DestLinkType=FullRecord&DestApp=WOS_CPL
U2 - 10.1364/JOSAA.35.000779
DO - 10.1364/JOSAA.35.000779
M3 - Article
C2 - 29726483
SN - 1084-7529
VL - 35
SP - 779
EP - 784
JO - Journal of the Optical Society of America A: Optics and Image Science, and Vision
JF - Journal of the Optical Society of America A: Optics and Image Science, and Vision
IS - 5
ER -