Composite single crystal silicon scan mirror substrates, Phase I

Metadata Updated: May 2, 2019

Single crystal silicon is a desirable mirror substrate for scan mirrors in space telescopes. As diameters of mirrors become larger, existing manufacturing capabilities of single crystal silicon (SCSi) cannot supply sizes that are larger than about 450 mm in diameter. Onyx Optics proposes to develop a process based on our established technique of Adhesive-Free Bonding (AFB[HTML_REMOVED]) of single crystals, optical ceramics and glasses that can produce sizes that are larger than commercially available SCSi. The precision composites, consisting of SCSi components, are expected to perform as well as a single crystal. Precision grinding and polishing of large composite SCSi without subsurface damage is a desirable feature for large scan mirror substrates. As part of the proposed manufacturing process, Onyx Optics proposes to develop a technique that is based on electrolytic in-process dressing (ELID) of grinding wheels of decreasing diamond grain sizes. The process is generally applicable to ductile grinding of hard materials such as glass, sapphire, silicon carbide, silicon nitride and SCSi and is known to result in low stress components.

Composite SCSi interfaces will be charactized interferometrically at 1.55 micron by their transmitted wavefront. Heat transfer measurements across bonded interfaces of SCSi will be performed at room temperature and liquid nitrogen. Equi-biaxial fracture strength of composite disks will be determined and compared with control disks.

Access & Use Information

Public: This dataset is intended for public access and use. License: U.S. Government Work

Downloads & Resources


Metadata Created Date August 1, 2018
Metadata Updated Date May 2, 2019

Metadata Source

Harvested from NASA Data.json

Additional Metadata

Resource Type Dataset
Metadata Created Date August 1, 2018
Metadata Updated Date May 2, 2019
Publisher Space Technology Mission Directorate
Unique Identifier TECHPORT_16633
Maintainer Email
Public Access Level public
Bureau Code 026:00
Metadata Context
Metadata Catalog ID
Schema Version
Catalog Describedby
Datagov Dedupe Retained 20190501230127
Harvest Object Id 6d27fd1e-c722-44c8-ab22-7983b95bcee1
Harvest Source Id 39e4ad2a-47ca-4507-8258-852babd0fd99
Harvest Source Title NASA Data.json
Data First Published 2013-11-01
Homepage URL
Data Last Modified 2018-07-19
Program Code 026:027
Source Datajson Identifier True
Source Hash ce39d25dacdf6d56f276b322f2642739d5891bd3
Source Schema Version 1.1

Didn't find what you're looking for? Suggest a dataset here.