Dr. Christophe Michel Profile

Dr. Christophe Michel

Research Engineer

Area of Expertise:

IBS coatings, large optics

Websites:

Company Website

Publications (11)

Proceedings Article | 13 December 2020 Poster + Paper

Dichroic coatings for astronomical instrumentation

E. Barthélémy-Mazot, M. Coulon, D. Hofman, C. Michel, L. Pinard, J. Teillon, B. Sassolas

Proceedings Volume 11451, 114515K (2020) https://doi.org/10.1117/12.2563398

KEYWORDS: Optical coatings, Astronomical instrumentation, Optics manufacturing, Astronomy, Astronomical imaging, Optical testing, Lawrencium, Spectrographs

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Proceedings Article | 10 July 2018 Paper

Dichroic and anti-reflective coatings for astronomical instrumentation

C. Michel, E. Barthelemy, D. Hofman, L. Pinard, B. Sassolas, J. Teillon, G. Cagnoli

Proceedings Volume 10706, 107064Y (2018) https://doi.org/10.1117/12.2312076

KEYWORDS: Optical coatings, Lenses, Antireflective coatings, Optics manufacturing, Spectrographs, Cameras, Reflectivity, Thin film coatings, Silica

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Proceedings Article | 10 July 2018 Presentation + Paper

High uniformity IBS coatings for the world’s largest Fabry-Perot etalon of the VTF instrument

L. Pinard, C. Michel, B. Sassolas, J. Teillon, G. Cagnoli, M. Sigwarth, T. Kentischer, W. Schmidt, B. Reichman

Proceedings Volume 10706, 107061R (2018) https://doi.org/10.1117/12.2312007

KEYWORDS: Fabry–Perot interferometers, Mirrors, Optical coatings, Reflectivity, LIGO, Interferometers, Wavefronts, Absorption, Silica, Coating equipment

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Proceedings Article | 9 August 2016 Paper

Development of high reflectivity coatings for large format Fabry-Perot etalons

M. Sigwarth, J. Baumgartner, A. Bell, G. Cagnoli, A. Fischer, C. Halbgewachs, F. Heidecke, Th. Kentischer, B. Kestner, P. Kuschnir, O. von der Lühe, L. Pinard, Ch. Michel, W. Reichman, B. Sassolas, Th. Scheiffelen, W. Schmidt

Proceedings Volume 9908, 99084F (2016) https://doi.org/10.1117/12.2232271

KEYWORDS: Fabry–Perot interferometers, Optical coatings, Reflectivity, Silica, Antireflective coatings, Prototyping, Annealing, Ion beam finishing, Thin film coatings, Polishing

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The Visible Tunable Filter (VTF) is a diffraction-limited narrowband tunable instrument for imaging spectropolarimetry in the wavelength range between 520 and 860 nm. It is based on large-format Fabry Perot. The instrument will be one of the first-light instruments of the 4m aperture Daniel K. Inoue Solar Telescope (DKIST). To provide a field of view of 1 arcmin and a spectral resolution λ/Δλ of about 100.000, the required free aperture of the Fabry Perot is 250mm. The high reflectivity coatings for the Etalon plates need to meet the specifications for the reflectivity over the entire wavelength range and preserve the plate figure specifications of better λ/300, and a micro roughness of < 0.4 nm rms. Coated surfaces with similar specifications have successfully been made for reflecting mirrors on thick substrates but not for larger format Fabry-Perot systems. Ion Beam Sputtering (IBS) based coatings provide stable, homogeneous, and smooth coatings. But IBS coatings also introduce stresses to the substrate that influence the plate figure in our case at the nm level. In a joint effort with an industry partner and a French CNRS research laboratory, we developed and tested processes on small and full size substrates, to provide coated Etalon plates to the required specifications. Zygo Extreme Precision Optics, Richmond, CA, USA, is polishing and figuring the substrates, doing the metrology and FE analysis. LMA (Laboratoire Matériaux Avancés, Lyon, France) is designing and making the IBS coatings and investigating the detailed behavior of the coatings and related processes. Both partners provide experience from manufacturing coated plane optics for gravitational wave detection experiments and EUV optics. The Kiepenheuer-Institut für Sonnenphysik, Freiburg, Germany is designing and building the VTF instrument and is leading the coating development. We present the characteristics of the coatings and the substrate processing concept, as well as results from tests on sample size and from full size substrate processing. We demonstrate that the tight specifications for a single Etalon can be reached.

Proceedings Article | 23 September 2015 Paper

Anti-reflective coating corrrection for ultra-low-reflectance large optics

B. Sassolas, J. Teillon, J. Degallaix, C. Michel, L. Pinard, G. Cagnoli

Proceedings Volume 9627, 96271V (2015) https://doi.org/10.1117/12.2191242

KEYWORDS: Reflectivity, Coating, Antireflective coatings, Crystals, Quartz, Sensors, Refractive index, Calibration, Ion beams, Sputter deposition

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Proceedings Article | 28 June 2013 Paper

Large filters for wide-field survey telescope LSST

Nazario Morgado, Laurent Pinard, Benoit Sassolas, Raffaele Flaminio, Daniéle Forest, Bernard Lagrange, Christophe Michel, Pierre Antilogus

Proceedings Volume 8450, 84503Q (2013) https://doi.org/10.1117/12.926071

KEYWORDS: Linear filtering, Optical filters, Large Synoptic Survey Telescope, Optical coatings, Mirrors, Absorption, Sensors, Transmittance, Digital filtering, Silica

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Proceedings Article | 18 December 2012 Paper

Realization of low-loss mirrors with sub-nanometer flatness for future gravitational wave detectors

C. Michel, N. Morgado, L. Pinard, B. Sassolas, R. Bonnand, J. Degallaix, D. Forest, R. Flaminio, G. Billingsley

Proceedings Volume 8550, 85501P (2012) https://doi.org/10.1117/12.981766

KEYWORDS: Mirrors, Coating, Sensors, Silica, LIGO, Fabry–Perot interferometers, Absorption, Scattering, Planetary systems, Thin film coatings

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Proceedings Article | 24 September 2012 Paper

LSST camera optics design

Scot Olivier, Vincent Riot, David Gilmore, Brian Bauman, Steve Pratuch, Lynn Seppala, John Ku, Martin Nordby, Mike Foss, Pierre Antilogus, Nazario Morgado, Benoit Sassolas, Raffaele Flaminio, Christophe Michel

Proceedings Volume 8446, 84466B (2012) https://doi.org/10.1117/12.926710

KEYWORDS: Cameras, Optical filters, Large Synoptic Survey Telescope, Lenses, Coating, Interfaces, Optical design, Bandpass filters, Spherical lenses, Silica

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Proceedings Article | 4 October 2011 Paper

Thickness uniformity improvement for the twin mirrors used in advanced gravitational wave detectors

B. Sassolas, Q. Benoît, R. Flaminio, D. Forest, J. Franc, M. Galimberti, A. Lacoudre, C. Michel, J.-L. Montorio, N. Morgado, L. Pinard

Proceedings Volume 8168, 81681Q (2011) https://doi.org/10.1117/12.896318

KEYWORDS: Mirrors, Coating, Silica, LIGO, Sensors, Interferometers, Reflectivity, Sputter deposition, Tantalum, Refractive index

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Proceedings Article | 3 April 2008 Paper

EUV near normal incidence collector development at SAGEM

R. Mercier Ythier, X. Bozec, R. Geyl, A. Rinchet, Christophe Hecquet, Marie-Françoise Ravet-Krill, Franck Delmotte, Benoît Sassolas, Raffaele Flaminio, Jean-Marie Mackowski, Christophe Michel, Jean-Luc Montorio, Nazario Morgado, Laurent Pinard, Elodie Roméo

Proceedings Volume 6921, 692135 (2008) https://doi.org/10.1117/12.787620

KEYWORDS: Reflectivity, Mirrors, Coating, Extreme ultraviolet, Plasma, Manufacturing, Polishing, Annealing, Grazing incidence, Silicon carbide

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Proceedings Article | 26 February 2004 Paper

Original optical metrologies of large components

Bernard Cimma, Danielle Forest, Patrick Ganau, Bernard Lagrange, Jean-Marie Mackowski, Christophe Michel, Jean-Luc Montorio, Nazario Morgado, Renee Pignard, Laurent Pinard, Alban Remillieux

Proceedings Volume 5252, (2004) https://doi.org/10.1117/12.513279

KEYWORDS: Absorption, Coating, Birefringence, Silica, Sapphire, Mirrors, Sensors, Interferometers, Metrology, Scattering

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Showing 5 of 11 publications

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