Abstract
In order to verify the effect of stray light elimination design, the detailed stray light analysis of one modified large aperture optical telescope using TracePro is described in this paper. Firstly, the sources of stray light in optical telescope and the influence of stray light on optical telescope are introduced. Then, the principle of stray light analysis using TracePro is presented. The solid model, surface properties and light paths of the modified large aperture optical telescope are determined. Ray splitting and importance sampling are adopted to ensure the calculation accuracy and reduce the time consumption. The Point Source Normalized Irradiance Transmittance (PSNIT) curve of the system is plotted. It shows the PSNITs are less than 10<sup>-12</sup> when off-axis angles are larger than 30°, which satisfies the requirement of the system. Finally, the several special fields of stray light control are discussed.
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