Optical design of the freeform reflective imaging system with wide rectangular FOV and low F-number

被引：32

作者：

Wu, Weichen ^{[1
]}

Jin, Guofan ^{[1
]}

Zhu, Jun ^{[1
]}

机构：

[1] Tsinghua Univ, Dept Precis Instrument, State Key Lab Precis Measurement Technol & Instru, Beijing 100084, Peoples R China

来源：

RESULTS IN PHYSICS | 2019年 / 15卷

基金：

中国国家自然科学基金;

关键词：

Freeform imaging system; Wide field-of-view; Low F-number; Field extension construction; ABERRATION FIELDS; SURFACES;

D O I：

10.1016/j.rinp.2019.102688

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In recent years, freeform optical surfaces have been used increasingly in a variety of off-axis reflective imaging systems with high performance levels. However, it is a difficult and challenging task to design an off-axis reflective imaging system that has a low F-number and a wide rectangular field-of-view (FOV) simultaneously. In this paper, the field extension construction (FEC) design method is proposed to design a freeform imaging system with both a low F-number and a wide rectangular FOV. When using an existing normal system with a small rectangular FOV as the input, an initial configuration that simultaneously has both a low F-number and a wide rectangular FOV can be obtained after several system construction attempts. A freeform reflective infrared camera is then successfully designed after optimization and has a focal length of 9.3 mm, an F-number of 1.39, and a wide rectangular FOV of 40 degrees x 30 degrees. The image quality is close to the diffraction-limited level in the farinfrared band and the maximum relative distortion is 5.5%. In addition, the system prototype is presented after fabrication and its good practical imaging performance is demonstrated.

引用

页数：7

共 27 条

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