ZERODUR: progress in CTE characterization

Ralf Jedamzik; Clemens Kunisch; Thomas Westerhoff

doi:10.1117/12.2022445

26 September 2013 ZERODUR: progress in CTE characterization

Ralf Jedamzik, Clemens Kunisch, Thomas Westerhoff

Proceedings Volume 8860, UV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts VI; 88600P (2013) https://doi.org/10.1117/12.2022445
Event: SPIE Optical Engineering + Applications, 2013, San Diego, California, United States

Abstract

In 2010, SCHOTT introduced a method for the modeling of the thermal expansion behavior of ZERODUR^® under arbitrary temperature profiles for an optimized production of material for the upcoming Extremely Large Telescope (ELT) projects. In 2012 a new product was introduced based on this method called ZERODUR^® TAILORED. ZERODUR^® TAILORED provides an evolution in the specification of the absolute Coefficient of Thermal Expansion (CTE) value by including the individual customer requirements in this process. This paper presents examples showing the benefit of an application oriented approach in the design of specifications using ZERODUR^®. Additionally it will be shown how the modeling approach has advanced during the last years to improve the prediction accuracy on long time scales. ZERODUR^® is known not only for its lowest CTE but also for its excellent CTE homogeneity as shown in the past for disc shaped blanks typical for telescope mirror substrates. Additionally this paper presents recent results of CTE homogeneity measurements in the single digit ppb/K range for a rectangular cast plate proving that the excellent CTE homogeneity is independent of the production format.

Citation Download Citation

Ralf Jedamzik, Clemens Kunisch, and Thomas Westerhoff "ZERODUR: progress in CTE characterization", Proc. SPIE 8860, UV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts VI, 88600P (26 September 2013); https://doi.org/10.1117/12.2022445

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available