Optical fabrication of the MMT adaptive secondary mirror

@inproceedings{Martin2000OpticalFO,
  title={Optical fabrication of the MMT adaptive secondary mirror},
  author={Hubert M. Martin and James H. Burge and Ciro del Vecchio and Lee R. Dettmann and Stephen M. Miller and Bryan K. Smith and F. Wildi},
  booktitle={Astronomical Telescopes and Instrumentation},
  year={2000}
}
  • H. Martin, J. Burge, +4 authors F. Wildi
  • Published in
    Astronomical Telescopes and…
    7 July 2000
  • Physics, Engineering, Materials Science
We describe the optical fabrication of the adaptive secondary mirror for the MMT. The 640 mm f/15 secondary consists of a flexible glass shell, 1.8 mm thick, whose shape is controlled by 336 electromagnetic actuators. It is designed to give diffraction-limited images at a wavelength of 1 micron. For generating and polishing, the shell was supported by attaching it to a rigid glass blocking body with a thin layer of pitch. It could then be figured and measured using techniques developed for… 
Stress polishing of thin shells for adaptive secondary mirrors. Application to the Very Large Telescope deformable secondary
Context. Adaptive secondary mirrors (ASM) are, or will be, key components on all modern telescopes, providing improved seeing conditions or diffraction limited images, thanks to the high-order
A novel approach for the realization of thin glass substrates for optical mirrors
We present a manufacturing process based on the deterministic polishing and figuring of thin glass substrates (shells), with thickness ranging from 0.5 up to a few millimeters, in “stand-alone”
The adaptive secondary mirror for the 6 . 5 m conversion of the Multiple Mirror Telescope Venice 2001 Beyond Conventional Adaptive Optics
We present the laboratory results obtained with a non-conventional secondary mirror that will be used as corrector for the adaptive optics system of the 6.5m conversion of MMT. The design of the unit
The adaptive secondary mirror for the 6.5 conversion of the Multiple Mirror Telescope
We present the laboratory results obtained with a non-conventional secondary mirror that will be used as corrector for the adaptive optics system of the 6.5m conversion of MMT. The design of the unit
Thin glass shells for active optics for future space telescopes
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
Fabrication of mirrors for the Magellan Telescopes and the Large Binocular Telescope
We describe the fabrication and testing of the 6.5 m f/1.25 primary mirrors for the Magellan telescopes and the 8.4 m f/1.14 primary mirrors for the Large Binocular Telescope (LBT). These mirrors,
Manufacturing of thin glass shells for future space telescopes
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
Adaptive secondary mirror for the 6.5-m conversion of the Multiple Mirror Telescope: latest laboratory test results of the P36 prototype
The 336-actuator adaptive secondary unit (MMT336) for the new MMT is being assembled in Italy and will be delivered in June 2000 for the acceptance test at Steward Observatory (Tucson, AZ). The
Adaptive deformable mirror : based on electromagnetic actuators
Refractive index variations in the earth's atmosphere cause wavefront aberrations and limit thereby the resolution in ground-based telescopes. With Adaptive Optics (AO) the temporally and spatially
Optics for the 20/20 telescope
We present a plan for making the optics of a 21 m telescope that builds on advances in mirror design and fabrication developed for the Large Binocular Telescope and other large telescopes. The 21 m
...
1
2
3
...

References

SHOWING 1-10 OF 14 REFERENCES
Fabrication of ultrathin mirrors for adaptive and space optics
We describe the optical fabrication of thin glass shells which will be combined with rigid active supports for adaptive secondary mirrors and for space optics. These applications require glass shells
Measurement of large convex aspheres
  • J. Burge
  • Materials Science, Engineering
    Other Conferences
  • 1997
Large convex aspheres are notoriously difficult to fabricate because of the tremendous cost and difficulty of making accurate measurements of the optical surfaces. The new 6.5- and 8-m-class
Polishing of a 6.5-m f/1.25 mirror for the first Magellan telescope
We describe the optical fabrication and testing of the 6.5 m f/1.25 primary mirror for the first Magellan telescope. Figuring was performed with a 1.2m stressed lap, which bends under active control
High-order adaptive secondary mirrors: where are we?
TLDR
The current developments and the perspective performances of adaptive secondary mirrors for high order adaptive a correction on large ground based telescopes are discussed and how the results obtained by of the two prototypes will guide the design of full size adaptive secondary units are discussed.
Optical system for closed-loop testing of an adaptive optic convex mirror
Steward Observatory is building a deformable f/15 secondary mirror for the 6.5 m Multiple Mirror Telescope conversion that will compensate for atmospheric turbulence. A potential difficulty of an
Fabrication of large secondary mirrors for astronomical telescopes
A new class of telescope is being built with primary mirrors as large as 8.4 meters in diameter and as fast as f/1. Fabricating the secondary mirrors for these telescopes has presented tough
Progress in the stressed-lap polishing of a 1.8-m f/1 mirror
We are in the process of polishing a 1.8-rn f/i ellipsoid with an actively stressed lap. As a preliminary exercise, we have polished the mirror as a sphere using a rigid subdiameter lap. The overall
Infrared adaptive optics system for the 6.5-m MMT: system status and prototype results
The Multiple Mirror Telescope (MMT) is now being replaced by a single 6.5m telescope which will have an integral adaptive optics system optimized for near IR operation. We illustrate key results
Practical design and performance of the stressed-lap polishing tool.
TLDR
An overview of the engineering design and empirical performance of four stressed-lap polishing tools developed at the University of Arizona and the statistical likelihood of aluminum lap-plate failure through a metal-fatigue analysis for a worst-case stress-cycling situation is estimated.
...
1
2
...