宽波段超大孔径反衍望远系统设计

二元光学器件除了能减小成像系统的体积、重量和成本外,还具有许多传统光学元件无法比拟的优越性.分别利用两个二元光学器件作为系统物镜和目镜,依据Schupmann望远系统设计了25 m口径超大孔径反衍混合望远系统,弥散斑大小以及MTF函数都能够达到设计要求.并提出使用谐衍射透镜代替普通衍射透镜,对系统进行了进一步改进,使望远系统获得较宽的光谱范围.研究结果表明,该望远系统无论是在单一光谱,多频带光谱或者连续光谱范围,都能够获得接近衍射极限的成像质量.

Design of Hybrid Reflective-diffractive Telescope with Very Large Aperture and Broad Bandwidth

The binary optical elements used in imaging systems have many advantages besides the features of saving in mass, volume and low cost. According to Schupmann telescope,a hybrid reflective and diffractive telescope with very large aperture about 25 m was designed,using two binary optical elements as its objective and eyepiece, and the diffuse spot size and MTF function of the telescope could meet requirements. Instead of ordinary diffractive lenses, multiorder diffractive lenses were introduced to improve the performance of the system, so that telescope could get broad bandwidth. Result shows that, the telescope can provide near diffraction-limited imaging with either single-band,multiband,or continuous coverage.