In order to deduce the difficulty of fixing the Ritchey-Chretien (R-C) dual reflective
optical system and enhance the stability of the secondary mirror, a compact integral structure is
presented here composed of two transmitting and two reflective aspheric surfaces. The four surfaces
were manufactured from a single germanium lens and integrated together. The two reflective surfaces
formed by coating the inner reflecting films were assembled in one lens. It makes the installation
of the two mirrors easier and the structure of the secondary mirror more stable. A design of
mid-wave infrared (MWIR) compact imaging system is presented with a spectral range chosen as
3.7-4.8 μm. The effective focal length is f=90 mm. The field of view
(FOV) for the lens is 4.88°. It has good imaging capability with
Modulation Transfer Function (MTF) of all field of view more than 0.55 close to the diffraction
limitation. Outdoor experiments were carried out and it is shown that the integral catadioptric
optical system performs well on imaging.
© 2013 Optical Society of Korea
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