Preliminary Optical Designs For An MMT Upgrade: A 256-Inch Filled-Aperture Optical/Infrared Telescope

Harland W. Epps

doi:10.1117/12.940215

10 June 1987 Preliminary Optical Designs For An MMT Upgrade: A 256-Inch Filled-Aperture Optical/Infrared Telescope

Harland W. Epps

Proceedings Volume 0766, Recent Trends in Optical Systems Design and Computer Lens Design Workshop; (1987) https://doi.org/10.1117/12.940215
Event: OE LASE'87 and EO Imaging Symposium, 1987, Los Angeles, CA, United States

Abstract

A preliminary optical design is proposed to convert the existing Multiple Mirror Telescope (MT) on Mount Hopkins to the maximum diameter, filled-aperture optical/infrared telescope that can be accommodated by the existing telescope mounting and building without substantial modification. The design utilizes a 256-inch diameter f/1.00 primary mirror which is chosen to be parabolic in order to provide adequate field of view at the required f/45.0 infrared Cassegrain focus. A 40-arcmin-diameter flat field of view is provided at an f/4.5 optical Cassegrain focus such that the resulting image scale gives a sampling factor of 3.5 (27 μ) pixels per (2/3 arcsec) spatial information element. The three-element refracting field corrector contains material for an atmospheric dispersion compensator (ADC) and it is fully color-corrected such that the entire passband from 0.33 μ to 1.60 μ can be imaged simultaneously. An f/9.0 Cassegrain focal expander-corrector with (ADC) is provided which uses the f/4.5 secondary mirror and enables the new telescope optics to be coupled to existing ancillary MMT instrumentation without substantial modification to the latter. A two-element all-spherical null-lens design is presented which provides a diffraction limited optical null-test arrangement for the unprecedentedly large f/1.00 parabolic primary mirror.

Citation Download Citation

Harland W. Epps "Preliminary Optical Designs For An MMT Upgrade: A 256-Inch Filled-Aperture Optical/Infrared Telescope", Proc. SPIE 0766, Recent Trends in Optical Systems Design and Computer Lens Design Workshop, (10 June 1987); https://doi.org/10.1117/12.940215

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KEYWORDS

Mirrors

Optical design

Telescopes

Aspheric lenses

Monochromatic aberrations

Infrared radiation

Image quality

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