Ritchey–Common sparse-aperture testing of the Giant Steerable Science Mirror

An, Qichang; Zhang, Jingxu; Yang, Fei; Zhao, Hongchao; Hai-feng, Cao

doi:10.1364/ao.57.007764

Cited by 4 publications

(3 citation statements)

References 33 publications

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“…The principle of detecting Φ2m plane mirror based on the Ritchey-Common method is shown in Figure 1 [1][2][3][4][5] .A beam of parallel light emitted by the interferometer is concentrated at point O through a standard spherical lens, and then reflected to a spherical mirror by a plane mirror. Then, it is reflected back to the interferometer by spherical mirror and plane mirror in turn, and forms interference with the reference beam in the interferometer.The center of curvature of the reflecting spherical mirror coincides with the focal position O of the interferometer.The angle between the chief ray and the normal of the plane mirror is called the Ritchey angle θ.…”

Section: Error Analysis Methods 21 Ritchey-common Detection Principlementioning

confidence: 99%

“…With the development of optical domains such as astronomical optics, space optics, and large-aperture optical systems, it is urgent to manufacture larger-aperture flat mirrors as standard components for detecting the above-mentioned devices [1,8] . In recent years, the demand for large-diameter flat mirrors at home and abroad has become more and more extensive, and the technical requirements for the detection of mirror surface shape accuracy are getting higher and higher.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Analysis and detection of optical path error of large aperture plane mirror

Wang

Yang

et al. 2023

AOPC 2022: Novel Optical Design; And Optics Ultra Precision Manufacturing and Testing

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When the Ritchey-Common method is used for high-precision surface shape detection of large-aperture plane mirrors, a reflective spherical mirror needs to be used to build the detection optical path.When building the detection optical path, the plane mirror and the spherical mirror has a large diameter and a long detection optical path, so there are various artificial adjustment errors.In order to solve the problems of high-precision surface shape detection of large-diameter plane mirrors, two common adjustment errors of eccentricity and tilt during optical path detection are analyzed.By using optical software to build a large-diameter plane mirror detection optical path model, set different eccentricity and tilt errors to obtain the system wave aberration, solve the system wave aberration data to obtain the plane mirror shape to be measured, and compare it with the preset standard surface shape.The simulation of a 2m plane mirror shows that the difference between the two Ritchey angles is in the range of 11°~30°.When the eccentricity error is controlled within 5% of the aperture and the tilt error is controlled within 1°,the surface shape recovery results are different from the standard surface RMS by the order of 10 -3 λ. Based on the above error simulation analysis, the actual Φ2m plane mirror shape detection is guided, and the results show that the RMS of the plane mirror reaches 0.0238λ, and the PV is 0.1629λ (λ=0.6328um). The purpose of this paper is to reveal the influence of the optical path adjustment error on the shape of the 2m plane mirror, so as to control the error of the plane mirror shape detection of the actual large-aperture mirror.

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Section: Error Analysis Methods 21 Ritchey-common Detection Principlementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis and detection of optical path error of large aperture plane mirror

Wang

Yang

et al. 2023

AOPC 2022: Novel Optical Design; And Optics Ultra Precision Manufacturing and Testing

View full text Add to dashboard Cite

show abstract

“…In the fields of space optics and astronomical optics, large optical flats are often used as reference surfaces in optical imaging system autocollimation tests. Thus, a high-quality surface or a suitable and highly precise test method is necessary [1,2]. Ritchey-Common (R-C) method is commonly used and effective for testing optical flat mirror surfaces of large aperture [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Influence of reference sphere on test accuracy of Ritchey–Common method

Zhu,

Zhang

2024

IET Optoelectronics

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The authors analyse the influence of reference sphere on the test accuracy of Ritchey–Common method during testing of flat mirror surface. A simulation model is established to simulate the influence of different radii of curvature of reference sphere on system wavefront. Then, the difference between the flat mirror surface result with reference sphere surface error to the actual flat mirror surface is examined by this model. The test accuracy of flat mirror result can be effectively improved by eliminating the influence of the surface error of reference sphere. When the surface accuracy of the reference sphere is better than 0.01 λ, the influence on RMS test accuracy is within 0.01 λ. R–C test path is built to test a 100 mm‐diameter flat mirror surface, and its results are compared with those of the flat mirror surface without surface error of reference sphere and with the test result of the interferometer. When the surface accuracy of the actual used area of reference sphere is better than 0.01 λ, the effect on flat mirror RMS accuracy is within 0.01 λ. The RMS test accuracy can reach 0.01 λ, when the surface error of reference sphere is retained. The experiment verifies the correctness of the simulation results and guarantees the improvement in the test accuracy of R–C method.

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Virtual-real combination Ritchey-Common interferometry

Liu

Zhang

et al. 2022

Opt. Express

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Large optical flats play a remarkable role in advanced large-aperture optical systems and the testing of the surface shape error is indispensable for the fabrication. The widely adopted Ritchey-Common test for large optical flats will fail without the rigorous test configurations including a large F/# prerequisition and a flat-to-interferometer distance invariance. A virtual-real combination Ritchey-Common interferometry is proposed to avoid the large F/# prerequisition by accurately modelling the optical path in a virtual interferometer. Furthermore, a virtual-real combination iterative algorithm is proposed in this method to break the flat-to-interferometer distance invariance. Measurement experiments for 100 mm and 422 mm aperture flats were performed to demonstrate the feasibility of this method. Compared with a direct testing in a standard Zygo interferometer, the peak to valley (PV) and root mean square (RMS) errors were less than 0.1 λ and 0.01 λ (λ=632.8 nm), respectively, in different Ritchey angles and flat-to-interferometer distances. Further numerical simulations demonstrate that RMS errors for various Zernike aberrations in arbitrary F/# are less than 0.01 λ. This method can break the distance invariance restriction and achieve high accuracy with an arbitrary F/#, thus providing substantial freedom in the design of test configurations to accommodate various test scenarios.

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Ritchey–Common sparse-aperture testing of the Giant Steerable Science Mirror

Cited by 4 publications

References 33 publications

Analysis and detection of optical path error of large aperture plane mirror

Analysis and detection of optical path error of large aperture plane mirror

Influence of reference sphere on test accuracy of Ritchey–Common method

Virtual-real combination Ritchey-Common interferometry

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