Abstract: An off-axis type refractive/diffractive Gregorian telescopic optical system without any aspherical element and center obscuration is presented in this paper. A binary optical element is used to correct aberrations and its size is reduced to 1/3 or 1/4 of the Schmidt corrector. Using OSLO SIX4.2 (Sinclair Optics Inc.) optical design software, an off-axis infrared refractive/diffractive hybrid telescopic system is designed with the parameters: aperture $phi $EQ 120 mm, effective focal length f $EQ $MIN@1000 mm, wavelength $lambda $EQ 4.3 $mu@m, the field of view 2$DGR $MUL 6$DGR@, resolution Res $EQ 50 um, modulation transfer function $GREQ 0.4 when the spatial frequency v $LSEQ 10 cycles/mm.!5
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