Improved reflective/diffractive hybrid wide field Cassegrain telescope

• Main Authors: GAO YIQING, XIAO MENGCHAO, LUO NINGNING, LI YUN, GONG YONGQING, YANG JUAN
• Format: Patent
• Language: Chinese; English
• Published: 01.08.2012
• Subjects: OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS

An improved reflective/diffractive hybrid wide field Cassegrain telescope is characterized in that a secondary lens is arranged on the left side of a prime lens; a light screen is connected to the back of the secondary lens; a follow-up corrective lens assembly is arranged on the right side of the prime lens; the follow-up corrective lens assembly consists of three sequential lenses that are all made of ordinary materials; the prime lens and the secondary lens are aspheric lenses and merely conicoid lenses, and diffractive optical elements are etched on the lenses, so as to facilitate correcting the systematic aberration. The invention has the characteristics that: firstly, the prime lens and the secondary lens are additionally provided with the diffractive optical elements on the basis of the conicoid, so as to meet the requirements of systematic wide field and improve the imaging quality; secondly, satisfactory imaging effect can be achieved by adopting the special materials or the complicated surface shape