Development of large aperture telescope technology (LATT): test results on a demonstrator bread-board

Briguglio, Runa; Xompero, Marco; Riccardi, Armando; Lisi, F.; Duò, Fabrizio; Vettore, Christian; Gallieni, Daniele; Tintori, Matteo; Lazzarini, Paolo; Patauner, Christian; Biasi, Roberto; D’Amato, Francesco; Pucci, Mauro; Carmo, J. Pereira do

doi:10.1117/12.2304228

Cited by 4 publications

(3 citation statements)

References 5 publications

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“…Methods for manufacturing thin glass optics were developed, often in the framework of adaptive optics solutions [5], which allow boosting the performance of present ground-based telescopes. The manufacturing processes used up to now involve the thinning and grinding of high-quality thick blanks in combination with stress polishing [6], stressed lap figuring [7], polishing and figuring [8,9] technologies. The baseline process of thinning a high value blank is a delicate step adequate for the production of single pieces, but less suited for the production of several units required for the assembly of large segmented adaptive or active systems.…”

Section: Introductionmentioning

confidence: 99%

Manufacturing of thin glass shells for future space telescopes

Vecchi

Basso

Civitani

et al. 2019

International Conference on Space Optics — ICSO 2018

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We present a method for the manufacturing of thin shells of glass, which appears promising for the production of lightweight mirrors for future space telescopes. The method exploits the synergy of different mature technologies, while it takes advantage of the commercial availability of large, high-quality sheets of glass, with thickness up to few millimeters. The first step of the method foresees the pre-shaping of flat substrates of glass by replicating the accurate shape of a mold via hot slumping technology. The replication concept can be strongly beneficial for making large optics composed of many identical or similar segments. After the hot slumping, the shape error residual on the optical surface is addressed by applying a deterministic sub-aperture technology as computer-controlled bonnet polishing and/or ion beam figuring. Here we focus on the bonnet polishing case, during which the thin, deformable substrate of glass is temporary stiffened by a removable holder. In this paper, we report on the latest results achieved on a 130 mm glass shell case study.

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Section: Introductionmentioning

confidence: 99%

Manufacturing of thin glass shells for future space telescopes

Vecchi

Basso

Civitani

et al. 2019

International Conference on Space Optics — ICSO 2018

View full text Add to dashboard Cite

show abstract

“…Methods for manufacturing thin glass optics were developed, often in the framework of adaptive optics solutions [8], which improve the performance of present ground-based telescopes. The manufacturing processes may involve the thinning and grinding of high-quality thick blanks in combination with stress polishing [9], stressed lap figuring [10], polishing and figuring [11][12][13] technologies. The baseline process of thinning a high value blank is a delicate step so far successfully applied for the production of monolithic units or few segments.…”

Section: Introductionmentioning

confidence: 99%

Thin glass shells for active optics for future space telescopes

et al. 2019

View full text Add to dashboard Cite

We present a method for the manufacturing of thin shells of glass, which appears promising for the development of active optics for future space telescopes. The method exploits the synergy of different mature technologies, while leveraging the commercial availability of large, high-quality sheets of glass, with thickness up to few millimeters. The first step of the method foresees the pre-shaping of flat substrates of glass by replicating the accurate shape of a mold via hot slumping technology. The replication concept is advantageous for making large optics composed of many identical or similar segments. After the hot slumping, the shape error residual on the optical surface is addressed by applying a deterministic sub-aperture technology as computer-controlled bonnet polishing and/or ion beam figuring. Here we focus on the bonnet polishing case, during which the thin, deformable substrate of glass is temporary stiffened by a removable holder. In this paper, we report on the results so far achieved on a 130 mm glass shell case study.

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“…Because of the thinning process, the optical shape is poorly controlled at the low orders; the high orders were, on the contrary, corrected down to 38 nm RMS and 72 nm RMS for the first and second TS respectively, when the polishing was stopped after meeting the project specifications. Details concerning the shape and optical quality of the TS produced for AO so far are given in [7]; more on the manufacturing may be found in [9]. On the back surface, a set of 19 magnets has been glued to provide the actuation point for the voice coil motors.…”

Section: Laboratory Demonstration With the Optical Breadboard (Obmentioning

confidence: 99%