采用折/衍光学元件结合的方法,使用两种普通国产玻璃K9和TF3,设计了工作波段为0.546~0.768 μm的3片式长焦物镜系统,并对其二级光谱进行了校正。将此设计结果与7片型,4种材料的全折射式长焦物镜的光学性能进行比较。结果表明,利用折/衍光学元件能在简化系统的基础上有效校正长焦物镜的像差,极大降低系统的长度、重量和复杂程度,其光学成像和结构性能优于全折射型。

By means of hybrid refractive-diffractive structure,a kind of three-elements telephoto lens based on two kinds of ordinary homebred glass K9 and TF3 has been designed. The working wavelength range of the system is 0.546~0.768 μm. The secondary spectrum has been revised. Its optical performances are compared with all refractive ones which are made of seven pieces of optical elements and four kinds of glass. The results show that hybrid refractive-diffractive lens can effectively eliminate the aberrance of telephoto lens and greatly reduce system length,weight,and complexity. The optical imaging and structure performances of hybrid refractive-diffractive telephoto lens are superior to all refractive system.