23 July 2008 Optical materials for astronomy from SCHOTT: the quality of large components
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Abstract
The new generation of survey telescopes and future giant observatories such as E-ELT or TMT do not only require very fast or very large mirrors, but also high sophisticated instruments with the need of large optical materials in outstanding quality. The huge variety of modern optical materials from SCHOTT covers almost all areas of specification needs of optical designers. Even if many interesting optical materials are restricted in size and/or quality, there is a variety of optical materials that can be produced in large sizes, with excellent optical homogeneity, and a low level of stress birefringence. Some actual examples are high homogeneous N-BK7 blanks with a diameter of up to 1000 mm, CaF2 blanks as large as 300 mm which are useable for IR applications, Fused Silica (LITHOSIL®) with dimensions up to 700 mm which are used for visible applications, and other optical glasses like FK5, LLF1 and F2 in large formats. In this presentation the latest inspection results of large optical materials will be presented, showing the advances in production and measurement technology.
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Ralf Jedamzik, Joachim Hengst, Frank Elsmann, Christian Lemke, Thorsten Döhring, Peter Hartmann, "Optical materials for astronomy from SCHOTT: the quality of large components", Proc. SPIE 7018, Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation, 70180O (23 July 2008); doi: 10.1117/12.788815; https://doi.org/10.1117/12.788815
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KEYWORDS
Birefringence

Glasses

Silica

Refractive index

Telescopes

Interferometers

Temperature metrology

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