This paper described an off-axis five-mirror-anastigmatic telescope. It is composed of
three aspheric surfaces and one spherical surface while the third mirror and fifth mirror have the
same parameters at the same place. This configuration is useful for having wide field of view. The
strip full field of view for the near infrared telescope is
20°×0.2°. The entrance pupil is located in front of
the first mirror. There is an intermediate image between the second mirror and the third mirror. The
entrance pupil diameter is 100 mm and the effective focal length is 250 mm. The spectral range is
0.85-1.75 μm. The pixel pitch is 15 μm. The
image quality is near the diffraction limit. Some methods were used to restrain the stray light such
as a field stop near the intermediate image, the baffle, the narrow-band pass filter and a stop in
front of the focal plane.
© 2012 Optical Society of Korea
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