Manufacturing of glassy thin shell for adaptive optics: results achieved

Poutriquet, F.; Rinchet, A.; Carel, Jean-Louis; Leplan, H.; Ruch, Eric; Geyl, Roland; Marque, G.

doi:10.1117/12.925344

Cited by 6 publications

(6 citation statements)

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“…SAGEM has delivered successfully a first science grade thin shell mirror this January to the DSM contractors Microgate and ADS Intl. [16] which constitutes an important milestone and success for the AOF project. SESO has delivered the reference body, another complex optical piece, to ADS/Microgate in August 2010.…”

Section: Project Status Overviewmentioning

confidence: 98%

“…This is the first such thin shell produced in Europe and SAGEM has mastered and validated a full manufacturing process [16]. The shell optical face was tested before thinning and the testing for the concave face consisted in ensuring a constant shell thickness (constant after removal of the systematic difference due to the convex asphere).…”

Section: Optics Delivery For the Dsmmentioning

confidence: 99%

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ESO adaptive optics facility progress report

et al. 2012

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The ESO Adaptive Optics Facility (AOF) consists in an evolution of one of the ESO VLT unit telescopes to a laser driven adaptive telescope with a deformable mirror in its optical train.The project has completed the procurement phase and several large structures have been delivered to Garching (Germany) and are being integrated (the AO modules GRAAL and GALACSI and the ASSIST test bench). The 4LGSF Laser (TOPTICA) has undergone final design review and a pre-production unit has been built and successfully tested. The Deformable Secondary Mirror is fully integrated and system tests have started with the first science grade thin shell mirror delivered by SAGEM. The integrated modules will be tested in stand-alone mode in 2012 and upon delivery of the DSM in late 2012, the system test phase will start. A commissioning strategy has been developed and will be updated before delivery to Paranal. A substantial effort has been spent in 2011-2012 to prepare the unit telescope to receive the AOF by preparing the mechanical interfaces and upgrading the cooling and electrical network. This preparation will also simplify the final installation of the facility on the telescope.A lot of attention is given to the system calibration, how to record and correct any misalignment and control the whole facility. A plan is being developed to efficiently operate the AOF after commissioning. This includes monitoring a relevant set of atmospheric parameters for scheduling and a Laser Traffic control system to assist the operator during the night and help/support the observing block preparation.

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Section: Project Status Overviewmentioning

confidence: 98%

Section: Optics Delivery For the Dsmmentioning

confidence: 99%

ESO adaptive optics facility progress report

et al. 2012

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“…Shell optical quality has also been specified as for the previous adaptive secondary mirrors [2], [3] .…”

Section: General Requirementsmentioning

confidence: 99%

Specifications and design of the E-ELT M4 adaptive unit

Vernet¹,

Cayrel²,

Hubin³

et al. 2012

SPIE Proceedings

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A 40 meters class telescope does require adaptive optics to provide few milli arcseconds resolution images. In the current design of the E-ELT, M4 provides adaptive correction and has also to cancel part of telescope wind shaking and static aberrations. The 2.4 meters adaptive mirror will provide as well Nasmyth focus selection.We will present the main design drivers and the main specifications quaternary mirror will have to meet. We will discuss what the challenges are in term of stability and performance of the associated key technologies. We will finally describe the current baseline design and the required schedule and work plan to adequately manufacture the E-ELT quartenary mirror.

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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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Manufacturing of glassy thin shell for adaptive optics: results achieved

Cited by 6 publications

References 0 publications

ESO adaptive optics facility progress report

ESO adaptive optics facility progress report

Specifications and design of the E-ELT M4 adaptive unit

Manufacturing of thin glass shells for future space telescopes

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