Manufacturing and testing of 1-m class SiC aspherical mirror

Zhang, Xuejun; Zhang, Zhongyu; Li, Zhilai

doi:10.1117/12.782696

Cited by 4 publications

(2 citation statements)

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“…The Null compensator usually will be applied in the aspheric interferometry, since the regular laser interferometer can only provide either planar or spherical wavefront. Through a theoretical analysis and a large number of engineering practices, Offner compensator provides a good compensation in aspherical interferometry when measuring aspheric with a large relative aperture [8] . The aspheric interferometry with Offner compensator is illustrated in Null lens Lapping/rough polishing figure 4.…”

Section: Fabrication and Testingmentioning

confidence: 99%

Technology on Fabrication of Precise SiC Aspherical Mirror

Zhang

2011

AMR

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This paper represents a technique to produce the large size optical aspherical mirror by using reaction-bonded silicon carbide to meet the material requirements of the space used mirrors, based on the characters comparison of all types mirror material. Techniques are described in this paper, including the bonding procedure of silicon carbide to form a mirror shape, the CCOM technology for aspheric grinding, polishing on a home-developed tool –FSGJ-2, and the aspheric profilometry. A specialized Offner Null lens is also developed to measure the aspherical mirror with laser interferometer. With the technology depicted in the paper, a 502mm x 298 mm off-axis SiC aspherical mirror is successfully made with a surface accuracy better than 1/50λrms, the final result meets the design requirement.

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Section: Fabrication and Testingmentioning

confidence: 99%

Technology on Fabrication of Precise SiC Aspherical Mirror

Zhang

2011

AMR

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“…The square mirror studied in this paper is the secondary mirror in the off-axis optical system and the farthest optical element in the system, which needs to withstand the harshest mechanical and thermal environment, and its surface shape accuracy directly affects the imaging quality of the entire remote sensing payload. As the farthest end of the system, the optical element needs to have a relatively light weight and high thermal dimensional stability when exposed to harsh thermal environments, and high stiffness is also required under harsh mechanical environments [6]. However, light weight, high stiffness, and thermal dimensional stability are usually contradictory, and a successful design seeks a balance so that its performance indicators meet the requirements.…”

Section: Introductionmentioning

confidence: 99%

Lightweight Design and Evaluation of Square Reflector

et al. 2023

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In order to reduce the weight of optical elements in space remote sensors while increasing their stiffness, this paper takes an off-axis system secondary mirror as an example to design a square mirror with a size of 500 mm × 500 mm. The mirror adopts ultra-low expansion glass as the raw material. The paper proposed a lightweight form of gradual reinforcement and conducted the mirror assembly simulation analysis. The analysis results show that the weight of the lightweight mirror is 13.6 kg, and the surface density can reach 54.4 kg/m2. Under the circumstances of 1 g gravity and the temperature change of 15 °C~25 °C, the surface shape accuracy of the mirror assembly can reach 1/90λ (λ = 632.8 nm). Through the final testing, the first-order intrinsic frequency of the reflex mirror components is 167.8 Hz. The gap between the test results and the theoretical simulation results is less than 3%, which proves that the mirror assembly in the lightweight form of gradual reinforcement fully meets the index requirements and can provide a theoretical reference for the assembly of a mirror of similar size and type.

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