A side-fed crossed Dragone telescope provides a wide field-of-view .
This type of a telescope is commonly employed in the measurement of cosmic microwave background ( CMB ) polarization , which requires an image-space telecentric telescope with a large focal plane over broadband coverage .
We report the design of the wide field-of-view crossed Dragone optical system using the anamorphic aspherical surfaces with correction terms up to the 10th order .
We achieved the Strehl ratio larger than 0.95 over 32 \times 18 square degrees at 150 GHz .
This design is an image-space telecentric and fully diffraction-limited system below 400 GHz .
We discuss the optical performance in the uniformity of the axially symmetric point spread function and telecentricity over the field-of-view .
We also address the analysis to evaluate the polarization properties , including the instrumental polarization , extinction rate , and polarization angle rotation .
This work is a part of programs to design a compact multi-color wide field-of-view telescope for LiteBIRD , which is a next generation CMB polarization satellite .