Optical glasses and glass ceramics for large optical systems

Doehring, Thorsten; Hartmann, Péter; Morian, Hans F.; Jedamzik, Ralf

doi:10.1117/12.458068

Cited by 9 publications

(4 citation statements)

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“…ZERODUR ® is an inorganic, non-porous glass ceramic with some extraordinary properties 1,3,4 . It owes approximately 70 to 78 percent of its weight to nano-crystallites of 30 nm to 50 nm in size, embedded in a remaining glassy phase (Figure 1a).…”

Section: Excurse: Technical Characteristics Of Zerodur ®mentioning

confidence: 99%

Forty years of ZERODUR mirror substrates for astronomy: review and outlook

Döhring

Jedamzik

Thomas

et al. 2008

Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation

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Initiated in 1968 by the first order of the Max-Planck-Institute in Heidelberg the successful history of ZERODUR ® continues now since 40 years. ZERODUR ® zero expansion glass ceramic from SCHOTT has been the material of choice in astronomy for decades, thanks to its special properties such as its extremely high thermal and mechanical stability. Today most of the major modern optical telescopes of the 4 m class and of the 8 m to 10 m class are equipped with ZERODUR ® . For the future several Extremely Large Telescope (ELT) projects are in development, which are designed with even larger primary mirrors ranging from 30 m to 42 m. Also here ZERODUR ® is under consideration. A historical review, the actual status of developments and an outlook to the future is given in this paper.

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Section: Excurse: Technical Characteristics Of Zerodur ®mentioning

confidence: 99%

Forty years of ZERODUR mirror substrates for astronomy: review and outlook

Döhring

Jedamzik

Thomas

et al. 2008

Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation

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“…In the construction of ELT´s one should not forget about the requirements of other large optical elements 18 . Especially the dimensions of the required optical blanks for correction lenses, spectrometers and for the camera systems may increase significantly.…”

Section: Discussionmentioning

confidence: 99%

Status of ZERODUR mirror blank production at SCHOTT

et al. 2005

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SCHOTT has a history of more than 35 years with the production of the zero expansion glass ceramic material ZERODUR. More than 250 ZERODUR mirror blanks were already delivered to the large segmented telescopes KECK I, KECK II, HET, GTC, and LAMOST. The increasing worldwide demand on large ZERODUR components for LCD display lithography machines is similar to the expected demand for an Extremely Large Telescope. Last year SCHOTT has ramped up its ZERODUR production capacity. These recent investments in additional melting and ceramisation capabilities are accompanied by improvements of quality assurance and processing technology. SCHOTT is now prepared also for a future production of mirror blanks for Extremely Large Telescopes. The present status of the production capacity and the mass production of ZERODUR mirror blanks for industrial applications are discussed.

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“…In [1,2] it was shown that the production of large format blanks is a time consuming process. The overall time needed is depending on the quality and dimensions of the glass, whereby the fine annealing is the most time consuming step in the process chain.…”

Section: Introductionmentioning

confidence: 99%

Large optical glass blanks for astronomy

Jedamzik

Hartmann

2004

Optical Fabrication, Metrology, and Material Advancements for Telescopes

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At present extremely large telescopes are planned with primary mirrors from 20 m up to 100 m. Such telescopes need not only huge mirror arrays but also downstream refractive optics like atmospheric dispersion correctors, color correctors for imaging and beam shapers for spectrometers. For classical boro-crown and lead-flint glass types blanks have been made in the past up to about 1 m. Now there is a increasing demand to be expected for optical glass blanks with diameters up to 1.5 m for use as lenses or prisms. Additionally optics designers ask for glass types like the low dispersion fluoro-phosphate glasses. The production of high quality blanks of such glasses has been a challenge even for diameters around 200 mm. This presentation shall give information about the feasibility of large glass blanks and recommendations how to specify the quality balancing the requirements of the application on one side and the possibilities and conditions of the production and the measurement for inspection on the other side.

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Optical glasses and glass ceramics for large optical systems

Cited by 9 publications

References 0 publications

Forty years of ZERODUR mirror substrates for astronomy: review and outlook

Forty years of ZERODUR mirror substrates for astronomy: review and outlook

Status of ZERODUR mirror blank production at SCHOTT

Large optical glass blanks for astronomy

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