ZERODUR iso-grid design of a 3m class light weighted mirror blank for the E-ELT M5

Ralf Jedamzik; Antoine Leys; Volker Seibert; Thomas Westerhoff

doi:10.1117/12.2054929

18 July 2014 ZERODUR iso-grid design of a 3m class light weighted mirror blank for the E-ELT M5

Ralf Jedamzik, Antoine Leys, Volker Seibert, Thomas Westerhoff

Proceedings Volume 9151, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation; 91510H (2014) https://doi.org/10.1117/12.2054929
Event: SPIE Astronomical Telescopes + Instrumentation, 2014, Montréal, Quebec, Canada

Abstract

The tip and tilt M5 mirror of the European Extremly Large Telescope (E-ELT) requires a demanding approach in light weighting. The approximately 3 m x 2.5 m elliptical plano mirror is specified to a weight of less than 500 kg with high Eigenfrequencies and low deformation under different inclination angles. In 2011 SCHOTT has presented a study to develop a design for the M5 mirror blank of the ESO E-ELT. The design presented was based on a radial square design to achieve the best compromise between performance and manufacturability. With the fabrication of a prototype section SCHOTT demonstrated its capability to manufacture the demanding features including pockets with 350 mm depth, thin walls and sloped pocket bottoms. Now 3 years later SCHOTT presents an iso-grid based design that is in accordance with the manufacturability progress that has been demonstrated in various ELZM (Extremely Lightweighted ZERODUR Mirrors) publications in the last two years. The achievements on the specified mechanical parameters are compared to the first approach from 2011. In this paper the results are presented and the performance parameters are discussed.

Citation Download Citation

Ralf Jedamzik, Antoine Leys, Volker Seibert, and Thomas Westerhoff "ZERODUR iso-grid design of a 3m class light weighted mirror blank for the E-ELT M5", Proc. SPIE 9151, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation, 91510H (18 July 2014); https://doi.org/10.1117/12.2054929

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KEYWORDS

Mirrors

Manufacturing

Zerodur

Polishing

Prototyping

Telescopes

Plano

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