The main feature of the compound diffractive telescope is the combination of diffractive optics with compound structure
arranged eyepieces. In this paper, a design of the compound diffractive telescope is firstly introduced, and a 4.2° FOV
is obtained with one primary lens and twenty-one eyepieces. Secondly, image characteristic of different channels is
analyzed with the design wavelength in ASAP, and one modified phase function model of diffractive optical element is
introduced to analyze the MTF curves for 0° FOV, which provides a more accurate prediction of the performance of the
system. Then the system is tested by the star image test, and the diffraction limit images are got within ± 2° FOV. And
finally, two pictures taken from the adjacent FOV proved to be able to be spliced together. All the results above
demonstrate that a good performance of the compound diffractive telescope.
The diffractive optical element (DOE) is always modeled as an ideal pure diffractive element which neglects the
refractive dispersion of the element's material. In this paper, a new model of the diffractive optical element is proposed,
in which the effect of the refractive dispersion of the DOE's material is considered. The new model is explained and
compared with standard diffraction-order expansion with the help of a hybrid system example. The analytical results
show that the new model has an important meaning for the exact analysis of the hybrid refractive-diffractive optical
system.
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