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New design method proposed for reflective optical system with low tilt error sensitivity

New design method proposed for reflective optical system with low tilt error sensitivity
FIG. 1. Mathematical model of single-mirror optical system. Credit: DOI: 10.1364 / OE.447556

Characterized by large aperture and long focal length, the reflective optical system has the advantages of a small number of optical elements and simple optical structure. However, the inherent aberration and the misalignment-derived aberration increase exponentially with the increase in focal length and aperture, resulting in a significant deterioration of the image quality of the optical system caused by only a small amount of misalignment.

In a study published in Optik Express, Prof. Meng Qingyu and his PhD student Qin Zichang from the Changchun Institute of Optics, Fine Mechanics and Physics (CIOMP) of the Chinese Academy of Sciences (CAS) proposed a comprehensive reflective optical system design method with low tilt error sensitivity. This method not only optimizes the imaging performance of the system and controls the tilt error sensitivity of the optical system, but also takes into account the uniformity of the sensitivity of each mirror in the system.

Using the method of geometric optics, the researchers established the mathematical analysis models of single-mirror system and two-mirror system. Through the theoretical derivation of the relationship between the diversity of optical path difference (OPD) caused by the slope of the optical system and the parameters of the optical system, they concluded that the large angle system has greater variation of OPD and higher sensitivity when tilt error applied, and the tangent tilt at the intersection of the beam and the mirror is the key factor in determining the error sensitivity of the optical system.

Based on the above findings, the researchers proposed the evaluation function S for tilt error sensitivity of optical system and established a desensitization design method for reflective optical system. Taking an off-axis three-mirror optical system with a focal length of 100 mm and an F-number of 5 as examples, they compared the tilt error sensitivity of the two systems before and after the desensitization design using the proposed method. The results showed that this method is effective.


Towards automatic design for free-form optics

More information: Zichang Qin et al., Design method for a reflective optical system with low tilt error sensitivity, Optik Express (2021). DOI: 10.1364 / OE.447556
Provided by the Chinese Academy of Sciences

Citation: New design method proposed for reflective optical system with low tilt-error sensitivity (2022, 18 January) retrieved 19 January 2022 from https://phys.org/news/2022-01-method-optical-tilt-error- sensitivity. html

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