Large optical space-based telescopes

Kirichenko, D. V.; Kleymyonov, V.V.; Новикова, Е. В.

doi:10.17586/0021-3454-2017-60-7-589-602

Cited by 9 publications

(2 citation statements)

References 32 publications

(51 reference statements)

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“…However, the larger size of the primary mirror in modern ground-based telescopes and space cameras imposes demanding stringent requirements on mirror materials and full-spatial frequency (FSF) shape errors control 14 , 15 . Therefore, breakthroughs in mirror materials, accurate and efficient manufacturing of large aspherical mirrors are urgently expected 16 .…”

Section: Introductionmentioning

confidence: 99%

Challenges and strategies in high-accuracy manufacturing of the world’s largest SiC aspheric mirror

Zhang

Wang

et al. 2022

Light Sci Appl

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In the process of manufacturing the world’s largest silicon carbide (SiC) aspheric mirror, the primary difficulties are mirror blank preparation, asphere fabrication, and testing, as well as cladding and coating. Specifically, the challenges include the homogeneity of the complicated structure casting, accuracy and efficiency of the fabrication process, print-through effect, fidelity and precision of test procedure, stress and denseness of cladding process, the dynamic range of interferometric measurement, and air turbulence error due to the long optical path. To break through such a barrier of difficulties, we proposed the water-soluble room temperature vanishing mold and gel casting technology, homogeneous microstructure reaction-formed joint technology, nano-accuracy efficient compound fabrication, gravity unloading technology, high-denseness low-defect physical vapor deposition (PVD) Si-cladding technology, test data fusion method, and time-domain averaging method, etc. Based on the proposed technologies and methods, we have accomplished the world’s largest SiC aspheric mirror with a size of ⌀4.03 m. The impressive performance of the SiC aspheric mirror is validated by the characteristics of the fabricated SiC aspheric mirror. The aerial density of the SiC blank is less than 120 kg/m2, surface shape test accuracy is better than 6 nm RMS, thickness inhomogeneity of the cladding layer is less than 5%, and the final surface figure error and roughness are 15.2 nm RMS and 0.8 nm RMS, respectively.

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Section: Introductionmentioning

confidence: 99%

Challenges and strategies in high-accuracy manufacturing of the world’s largest SiC aspheric mirror

Zhang

Wang

et al. 2022

Light Sci Appl

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“…As the performance requirements and resolution of optical systems increase, the aperture of modern ground-based telescopes and space cameras becomes larger and larger consequently. Higher requirements are placed on the materials, apertures, surface morphology, surface accuracy, and roughness of mirrors [14][15] . Breakthroughs in high-accuracy manufacturing technology for large aspheric mirrors are a necessary way to achieve high-resolution optical imaging [16] .…”

Section: Introductionmentioning

confidence: 99%

Challenges and strategies in high-accuracy manufacture of the world's largest SiC aspheric mirror

Zhang

2022

Preprint

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In consideration of the difficulties in the high-accuracy manufacture of the world's largest aperture SiC (silicon carbide) aspheric mirror, such as the difficulty of processing complex mirror blanks, low accuracy and efficiency of conventional processing, print-through effect, inconsistent processing and testing states, high stress/poor denseness of conventional cladding, the insufficient dynamic range of conventional measurement, and air turbulence of long optical path testing, we proposed the water-soluble room temperature vanishing mold and gel casting technology, homogeneous microstructure reaction-formed joint technology, nano-accuracy efficient convergence processing technology, gravity unloading technology, high-denseness low-defect PVD (Physical Vapor Deposition) cladding process, data fusion testing technology, time-domain averaging method, etc. On the basis of the proposed key technologies and methods, we have currently developed the world's largest SiC aspheric mirror with the size of ⌀4.03m. The impressive performance of the SiC aspheric mirror is verified as follows. The area density of the SiC blank is less than 120kg/m2; surface error testing accuracy is less than 6nm RMS; the thickness inhomogeneity of cladding layer is less than 5%; the final surface error and roughness are 15.2nm RMS and 0.78nm RMS, respectively.

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Improving the Resolution of Optical Signals in Transport Systems

Sytko

Shirobokov

2023

Lecture Notes in Networks and Systems

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Large optical space-based telescopes

Cited by 9 publications

References 32 publications

Challenges and strategies in high-accuracy manufacturing of the world’s largest SiC aspheric mirror

Challenges and strategies in high-accuracy manufacturing of the world’s largest SiC aspheric mirror

Challenges and strategies in high-accuracy manufacture of the world's largest SiC aspheric mirror

Improving the Resolution of Optical Signals in Transport Systems

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