Design of a free-form off-axis three-mirror optical system with a low f-number based on the same substrate

Author:

Sun Yuanhe1,Sun Yuanqi1ORCID,Chen Xiaoyu1,Wang Fang1ORCID,Yan Xin1,Zhang Xuenan1,Cheng Tonglei1ORCID

Affiliation:

1. Northeastern University

Abstract

In this paper, we design a free-form off-axis three-mirror optical system with a low f -number and compact structure, which can be used as an infrared reflection imager. The initial structure is calculated from the near-axis optical transfer matrix based on third-order aberration theory. Particular constraints are designed to install all mirrors on the same substrate for simultaneous milling, which reduces the processing difficulty and effectively avoids errors caused by component assembly. Zernike free-form surfaces are introduced to correct aberrations. This optical system has a field of view of 5 × 5 and an f -number of 1.82; the modulation transfer function of the system is higher than 0.6 at 30 lp/mm. The results of the tolerance assignment of the system were verified by the Monte Carlo method, and the machining tolerance is reasonable and easy to achieve. This design not only improves the optical performance of the system but also enhances the feasibility of manufacturing.

Funder

111 Project

Natural Science Foundation of Hebei Province

Department of Science and Technology of Liaoning Province

Fundamental Research Funds for the Central Universities

National Natural Science Foundation of China

National Key Research and Development Program of China

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics,Engineering (miscellaneous),Electrical and Electronic Engineering

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