NDLI: Quasi-monolithic structures for spaceflight using hydroxide-catalysis bonding

Content Provider	IEEE Xplore Digital Library
Author	Preston, A. Thorpe, J.I. Miner, L.
Copyright Year	2012
Description	Author affiliation: Goddard Space Flight Center, 8800 Greenbelt Rd, Greenbelt, MD 20771 (Preston, A.; Thorpe, J.I.; Miner, L.)
Abstract	Next generation space telescopes and interferometric missions will require stringent position and stability tolerances. To do this, these missions will require materials and bonding techniques with ever-increasing stability in order to make their measurements. As an example, the Laser Interferometer Space Antenna (LISA) will detect and observe gravitational waves in the 0.1 mHz to 1 Hz frequency range with strain sensitivities on the order of $10^{−21}$ at its most sensitive frequency. To make these measurements, critical components such as the optical bench or telescope support structure will need to have path-length stabilities of better than 1 pm/√Hz. The baseline construction method for the LISA optical bench is to affix fused silica components to a Zerodur baseplate using hydroxide-catalysis bonding (HCB). HCB is a recently developed technique that allows the bonding of glasses, some metals, and silicon carbide with significant strength and stability with a bond thickness of less than a few micrometers. In addition, a wide range of surface profiles can be bonded using only a small amount of hydroxide solution. These characteristics make HCB ideal for adhering components in complex optical systems. In addition to being used to construct the LISA optical bench, the HCB technique shows great promise for constructing other structures such as hollow retroreflectors to be used for lunar laser ranging, or a visible nulling coronograph to be used for exoplanet detection. Here we present construction techniques that could be used to make an optical bench, hollow retroreflector, nulling coronograph, or other quasi-monolithic structures using HCB. In addition, we present dimensional stability results of an optical bench that was made using HCB, as well as HCB strength measurements.
Starting Page	1
Ending Page	8
File Size	1003292
Page Count	8
File Format	PDF
ISBN	9781457705564
ISSN	1095323X
e-ISBN	9781457705571
DOI	10.1109/AERO.2012.6187157
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-03-03
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Optical interferometry Silicon compounds Bonding Cavity resonators Optical fibers Laser stability
Content Type	Text
Resource Type	Article
Subject	Aerospace Engineering Space and Planetary Science

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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