Light weight optics made by glass thermal forming for future x-ray telescopes

Winter, Anita; Vongehr, Monika; Friedrich, Péter

doi:10.1117/12.857147

Cited by 10 publications

(10 citation statements)

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“…The glass is positioned into a box with sodium light reflected to its surface. Since both surfaces of the glass are close enough together, the reflected light from both surfaces overlay and create an interference pattern, which directly displays the thickness profile of the glass [12]. With this method the quality of the glasses can be confirmed, particularly good glasses can be selected, and also glasses polished down to thickness variations of less than 1µm can be verified.…”

Section: B Thickness Measurement By Interferometrymentioning

confidence: 87%

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X-ray telescope mirrors made of slumped glass sheets

Winter

Breunig

Friedrich

et al. 2017

International Conference on Space Optics — ICSO 2014

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Section: B Thickness Measurement By Interferometrymentioning

confidence: 87%

“…This has the disadvantage that the micro roughness of the mould surface affects directly the optical surface of the mirror glass. However, the indirect slumping has to deal with the thickness variations in the glass [12] which need to be minimised in order to obtain a good quality mirror surface. Fig.…”

Section: A Glass Slumping Processmentioning

confidence: 99%

X-ray telescope mirrors made of slumped glass sheets

Winter

Breunig

Friedrich

et al. 2017

International Conference on Space Optics — ICSO 2014

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“…In particular, in USA NASA/Goddard Space Flight centre and Centre for Astrophysics (CfA) are involved in slumping activities for IXO [3], [4]. In Europe, INAF-OAB is developing the direct slumping with pressure, while MPE is investigating the indirect slumping approach [5], [6]. Typical dimensions of the slumped plates being actually considered are 200 mm x 200 mm with a thickness of 0.4 mm.…”

Section: Production Of Thin Glass Substratesmentioning

confidence: 99%

Thermal shaping of thin glass substrates for segmented grazing incidence active optics

et al. 2010

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In the context of the AHEAD project of the FP7 European call, a group of UK and Italian Institutions is proposing a research on X-ray optics that can provide large collecting areas (a few decades of m 2 ) combined with a high angular resolution (0.1-1 arcsec). This requires the development of Active X-ray Optics in which the reflecting surfaces can be adjusted-manipulated in order to achieve and maintain the correct shape. In the context of an international collaboration with UK institutes, the Astronomical Observatory of Brera (INAF-OAB) is in charge of the production of thin (0.4 mm or less) glass mirror segments for the demonstration of a 2-reflection active X-ray system including piezoelectric actuators to improve the angular resolution, For the shell segments production the hot slumping approach of glass foils, already under investigation for the realization of IXO mirrors, is adopted. In this paper, a detailed description of the method is presented, reporting also on the metrological data of produced samples.

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“…Depending on the side of the forming mirror that comes in contact with the mold, two approaches are possible: the direct approach, in which the optical surface of the mirror comes in contact with the mold during the process, and the indirect approach, in which contact happens on the back side. 20 The deformation of glass could take place only under its own weight (that is, by gravity) or can be actively supported by the application of additional external forces. The particular process considered in the present work is known as direct hot slumping with pressure assistance, 21 and is a direct approach characterized by the active application of pressure to help the glass reach full contact with the mold surface, ensuring the absence of mid-frequencies deformations (in the range between a few millimeters and a couple of centimeters) that degrade the optical performances.…”

Section: Hot Slumping Process With Pressure Assistancementioning

confidence: 99%

Evaluation of the surface strength of glass plates shaped by hot slumping process

et al. 2014

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Abstract. Hot slumping technology is under development by several research groups in the world for the realization of grazing-incidence segmented mirrors for x-ray astronomy, based on thin glass plates shaped over a mold at temperatures above the transformation point. The performed thermal cycle and related operations might have effects on the strength of the glass, with consequences for the structural design of the elemental optical modules and, consequently, on the entire x-ray optic for large astronomical missions such as IXO and ATHENA. The mechanical strength of glass plates after they underwent the slumping process was tested through destructive double-ring tests in the context of a study performed by the Astronomical Observatory of Brera with the collaboration of Stazione Sperimentale del Vetro and BCV Progetti. The entire study was done on more than 200 D263 Schott borosilicate glass specimens of dimensions 100 mm × 100 mm and a thickness 0.4 mm, either flat or bent at a radius of curvature of 1000 mm through the pressure-assisted hot slumping process developed by INAF-OAB. The collected experimental data have been compared with nonlinear finite element model analyses and treated with the Weibull statistic to assess the current IXO glass x-ray telescope design, in terms of survival probability, when subjected to static and acoustic loads characteristic of the launch phase. The paper describes the activities performed and presents the obtained results. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Light weight optics made by glass thermal forming for future x-ray telescopes

Cited by 10 publications

References 0 publications

X-ray telescope mirrors made of slumped glass sheets

X-ray telescope mirrors made of slumped glass sheets

Thermal shaping of thin glass substrates for segmented grazing incidence active optics

Evaluation of the surface strength of glass plates shaped by hot slumping process

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