China Successfully Developed The World''s Largest …
According to reports, the 1.5-meter and 2-meter-scale silicon carbide aspheric mirrors developed based on this project have been successfully applied to national major model tasks. In the future, the 4 m-scale silicon carbide aspherical mirror will also be applied to the national large-scale photovoltaic system, solving the core technical problems for the development of large-caliber optical
The Ultra-Precision Polishing of Large Aperture Reaction …
Problem statement: Silicon Carbide (SiC) optical materials have become the first choice for mirrors in space optical systems and large ground-based optical systems due to their outstanding mechanical, physical and optical properties. Compared with
Study on Surface Roughness of Modified Silicon Carbide …
2018/2/13· Study on Surface Roughness of Modified Silicon Carbide Mirrors polished by Magnetorheological Finishing Hang Du 1,2, Ci Song 1,2 and Shengyi Li 1,2 Published under licence by IOP Publishing Ltd IOP Conference Series: Materials Science and Engineering, ,
Optical Mirrors and Coatings for UV to IR - Pleiger …
Optical mirrors for maximum reflectivity on precisely polished silicon, copper, fused silica, beryllium, alu and SiC. Coating options available. Front Surface Optical Mirrors PLEIGER offers a wide range of optical first surface coatings for optical instruments and laser
Home | Aperture Optical Sciences - Optical Components
We employ advanced technologies for making high resolution satellite telescopes, aspheric mirrors, and have championed the implementation of Silicon Carbide Optics in the commercial marketplace. AOS optics are deployed around the world in aerospace imaging systems, industrial scanners, research facilities using advanced lasers, and remote sensing appliions.
AOA Xinetics – Image Metrology – Northrop Grumman
Recent processing breakthroughs attained the fabriion of meter class mirrors with areal densities of 5 kg/m2. CERAFORM Silicon Carbide can be directly polished to <10 Angstroms rms surface finish and with figures better than 1/10 PV. AOA Xinetics also
Silicon Carbide Structure Material for Optical Communiion
lid to protect the mirrors and as a transparent window that allows the optical probing signal to pass through and reach the CCR. We will first be discussing the silicon carbide as the structure layer and later illustrate how the vertical mirror was released and
Principal Program Cost Control Analyst at Northrop …
AOA Xinetics (AOX) designs, develops, and manufactures precision, advanced optical products and systems such as deformable mirrors, optical systems, adaptive optics control systems and silicon carbide optical structures for the U.S. Government
ION BEAM FIGURING OF CVD SILICON CARBIDE …
Chemical vapor deposited silicon carbide (CVD-SiC) is used as a reflective coating on SiC optics in reason of its good behavior under polishing. The advantage of applying ion beam figuring (IBF) to CVD-SiC over other surface figure-improving techniques is discussed herein.
Design, fabriion, and evaluation of an internally cooled …
In this article, the design, fabriion, prepolish coating, and polishing of a reaction-bonded (RB) internally cooled silicon carbide (SiC) mirror is described. The mirror was developed from a mold of SiC powder in a near-net shape and then infused with silicon vapor to make a dense mirror substrate. substrate.
Open Access proceedings Journal of Physics: Conference series
4. MRF Experiment of Modified Silicon Carbide As the "comet tail" is due to the difference material removed in the microscopic region, it is necessary to study the modified silicon carbide mirrors by MRF. The experimental method is to polish the
MERSEN | high-speed mirrors | Optosic | silicon carbide | …
These mirrors are manufactured as optoSiC+ grade, a unique Silicon Carbide, to give optimum stiffness, dynamic flatness and high resonant frequencies under high torque loadings. Our unique solution offers very low Moment of Inertia for all moving appliions where processing speed and precise performance is paramount.
Ultra-lightweight C/SiC Mirrors and Structures
Silicon-carbide (SiC) ceramic mirrors and structures are becoming increasingly important for lightweight opto-mechanical systems that must work in adverse environments. At DSS and IABG, a special form of SiC ceramic (C/SiC) has been developed under ESA
Optical Mirrors - Zygo Corporation
ZYGO''s Optics business segment manufactures reference mirrors to exacting standards. Our large polishing machines, (from 48" to 196" in diameter), allow ZYGO to make reference mirrors using a variety of materials including Fused Silica and low expansion
Boostec® Silicon Carbide - OPTOSIC - REFLECTING …
Boostec® Silicon Carbide Boostec® Silicon carbide is AN ADVANCED CERAMIC WITH MANY KEY ADVANTAGES high purity composition, with no secondary phase isotropic physical properties low density very high mechanical strength and rigidity (420 GPa)
Advancing aerospace materials - Company - Airbus
The largest mirrors in space “It started in the 1990s: astronomical telescopes were becoming larger and we needed a new material to reduce the mirror weight,” explains Airbus Defence and Space’s Emmanuel Sein. The answer was silicon carbide: lighter than metal
Porous single crystalline 4H silicon carbide rugate …
Porous 4H silicon carbide optical rugate mirrors have been fabried with a coination of metal assisted photochemical etching and photoelectrochemical etching. The degree of porosity was controlled by the applied voltage, while the etching depth was controlled by measuring the transferred charge.
Zygo Corporation Optical Mirrors Data Sheets | …
Silicon Carbide Mirror ZYGO''s Optics business segment custom manufactures silicon carbide mirrors to exacting standards. Silicon carbide (SiC) has long been recognized as an attractive mirror material due to its superior mechanical and
Shape Adaptive Grinding of CVD Silicon Carbide on Graphite for …
Shape Adaptive Grinding of CVD Silicon Carbide on Graphite for X-Ray Mirror Molding Dies Yoshiharu Naa, Anthony Beaucamp Richard Freeman (Zeeko Ltd.) Producing X-ray imaging telescopes is a very expensive endeavor, due in large
Theory reveals the nature of silicon carbide crystals defects
In addition, silicon carbide systems can operate at temperatures up to 650 degrees Celsius, while silicon systems already begin to have problems at 120 degrees Celsius. SiC also has a high melting
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ESA Science & Technology - Gaia mirrors ready to shine
All of the mirrors were fabried from blanks made of sintered silicon carbide (SiC), which were made by Boostec in France. After preliminary grinding and lapping to achieve a flat surface, all of the mirror blanks were sent to Schunk Kohlenstofftechnik in
NASA Technical Reports Server (NTRS) - Surface Figure …
2004/1/1· Two mirrors were supplied to GSFC by the European Space Technology Center, so that GSFC could render a second, independent cryo-measurement of their surface figures at 20K. These mirrors, produced by Galileo Avionica and its partners, demonstrate the technology of silicon carbide and SiC-composite lightweighted mirrors, designed for high accuracy (10 nm rms surface figure …
Silicon Carbide Substrates & Wafers Polishing Service | …
Silicon carbide wafers, substrates polished from Valley Silicon Carbide (SiC) Polished to Mirror Finish CVD Silicon Carbide theoretically dense and intrinsically pure, is available as lapped or polished substrates and wafers from 2" diameter up to 300mm diameter with surface finishes to better than 10 angstroms, while maintaining a 1/4 wave flatness depending on thickness and size.
Silicon infiltrated silicon carbide from extruded thermoplastic …
pumps, telescope mirrors as well as carriers for photovoltaic and solar thermic systems. The specific properties of SiC depend on the manufacturing route. Common types of SiC are sintered silicon carbide (SSiC), hot isostatically pressed silicon carbide The
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