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Active optics with a minimum number of actuators

  • Gerard R. Lemaitre

    Gerard R. Lemaitre is an emeritus professor at Aix-Marseille University (AMU). His research interests are in the fields of active optics methods, elasticity theory, optical design for telescopes, and astronomical instrumentations. He develops active optics methods, discovering and making variable curvature mirrors, a two-zone loading method for making aspheric plates, optics replication method via active deformable masters for making toroid or plane-apheric aberration-corrected gratings. He found the tulip form mirror class, cycloid-like form mirror class, vase form mirrors, and closed vase form mirrors for the aspherization by the elastic relaxation of telescope secondary mirrors and off-axis aberration-correcting mirrors. He is a holder of 10 patents and author of the book ‘Astronomical Optics and Elasticity Theory,’ Springer, 2010 (600p.). He has been leader for 30 years of the Marseille Observatory Optical Lab (LOOM) now at LAM. He established the optimal optical design to be given a reflective Schmidt system, was named an international member of the giant reflective Schmidt telescope LAMOST project committee by the Chinese Academy of Sciences – under operation at the Xinglong Station observatory of the NAOC – and of the 39-m ESE telescope committee for the E-ELT project by European Southern Observatory.

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Veröffentlicht/Copyright: 7. Juni 2014
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Advanced Optical Technologies
Aus der Zeitschrift Advanced Optical Technologies Band 3 Heft 3

Abstract

Optics for astronomy implies powerful developments of active and adaptive optics methods applied to instrumentation from X-rays to the near infrared for the design of telescopes, spectrographs, and coronagraph planet finders. This presentation particularly emphasizes the development of active optics methods. Highly accurate and remarkably smooth surfaces from active optics methods allow new optical systems that use highly aspheric and non-axisymmetric – freeform – surfaces. Depending on the goal and performance required for a deformable optical surface, elasticity theory analysis is carried out either with small deformation thin plate theory, large deformation thin plate theory, shallow spherical shell theory, or the weakly conical shell theory. A mirror thickness distribution is then determined as a function of associated bending actuators and boundary conditions. For a given optical shape to generate, one searches for optical solutions with a minimum number of actuators.

Keywords: active optics; astronomical optics; elasticity theory; optical design; X-ray optics
OCIS codes: 010.1080; 220.0220; 050.1950; 220.1000; 220.1250; 340.7470; 350.1260
Corresponding author: Gerard R. Lemaitre, Laboratoire d’Astrophysique de Marseille, LOOM, Aix Marseille Université and CNRS, 38 rue Fréderic Joliot-Curie, F-13388 Marseille CX 13, France, EU, e-mail:

About the author

Gerard R. Lemaitre

Gerard R. Lemaitre is an emeritus professor at Aix-Marseille University (AMU). His research interests are in the fields of active optics methods, elasticity theory, optical design for telescopes, and astronomical instrumentations. He develops active optics methods, discovering and making variable curvature mirrors, a two-zone loading method for making aspheric plates, optics replication method via active deformable masters for making toroid or plane-apheric aberration-corrected gratings. He found the tulip form mirror class, cycloid-like form mirror class, vase form mirrors, and closed vase form mirrors for the aspherization by the elastic relaxation of telescope secondary mirrors and off-axis aberration-correcting mirrors. He is a holder of 10 patents and author of the book ‘Astronomical Optics and Elasticity Theory,’ Springer, 2010 (600p.). He has been leader for 30 years of the Marseille Observatory Optical Lab (LOOM) now at LAM. He established the optimal optical design to be given a reflective Schmidt system, was named an international member of the giant reflective Schmidt telescope LAMOST project committee by the Chinese Academy of Sciences – under operation at the Xinglong Station observatory of the NAOC – and of the 39-m ESE telescope committee for the E-ELT project by European Southern Observatory.

References

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Received: 2014-2-27
Accepted: 2014-4-17
Published Online: 2014-6-7
Published in Print: 2014-6-1

©2014 THOSS Media & De Gruyter Berlin/Boston

Artikel in diesem Heft

  1. Frontmatter
  2. Community
  3. News from the European Optical Society
  4. Conference Notes
  5. Conference Calendar
  6. Topical Issue: Optics for Astronomy / Guest Editors: Jan Burke, Andrew Rakich and Jim Burge
  7. Editorial
  8. Optics for astronomy – Editorial
  9. Review Articles
  10. Active optics with a minimum number of actuators
  11. Highly sensitive telescope designs for higher contrast observations
  12. Replicated spectrographs in astronomy
  13. Ultra-smooth finishing of aspheric surfaces using CAST technology
  14. Hydroxide catalysis bonding for astronomical instruments
  15. Research Articles
  16. Fabrication and metrology of lithium niobate narrowband optical filters for the solar orbiter
  17. A method for the use of ellipticities and spot diameters for the measurement of aberrations in wide-field telescopes
  18. Deflectometric measurement of large mirrors
  19. The Four-Laser Guide Star Facility: Design considerations and system implementation
https://doi.org/10.1515/aot-2014-0014
Schlagwörter für diesen Artikel
active optics; astronomical optics; elasticity theory; optical design; X-ray optics

Artikel in diesem Heft

  1. Frontmatter
  2. Community
  3. News from the European Optical Society
  4. Conference Notes
  5. Conference Calendar
  6. Topical Issue: Optics for Astronomy / Guest Editors: Jan Burke, Andrew Rakich and Jim Burge
  7. Editorial
  8. Optics for astronomy – Editorial
  9. Review Articles
  10. Active optics with a minimum number of actuators
  11. Highly sensitive telescope designs for higher contrast observations
  12. Replicated spectrographs in astronomy
  13. Ultra-smooth finishing of aspheric surfaces using CAST technology
  14. Hydroxide catalysis bonding for astronomical instruments
  15. Research Articles
  16. Fabrication and metrology of lithium niobate narrowband optical filters for the solar orbiter
  17. A method for the use of ellipticities and spot diameters for the measurement of aberrations in wide-field telescopes
  18. Deflectometric measurement of large mirrors
  19. The Four-Laser Guide Star Facility: Design considerations and system implementation
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