Diffraction-limited constant-resolution zoom lens across multi-wavelengths for the Advanced Technology Solar Telescope

Hyun Kyoung An; Stephen K. Pitalo

doi:10.1117/12.692300

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18 July 2006 Diffraction-limited constant-resolution zoom lens across multi-wavelengths for the Advanced Technology Solar Telescope

Hyun Kyoung An, Stephen K. Pitalo

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Proceedings Volume 6342, International Optical Design Conference 2006; 63421L (2006) https://doi.org/10.1117/12.692300
Event: International Optical Design Conference 2006, 2006, Vancouver, BC, Canada

Abstract

Zoom lenses are usually designed for a specified waveband and change magnification, and thus resolution, for different object sizes or different object distances. However, the Advanced Technology Solar Telescope (ATST)/ Visible Light Broadband Imager (VLBI), under development by the National Solar Observatory, require constant resolution for different wavelengths over a wide spectral range (388.3 nm 3o 854.2 nm). An eight-element zoom lens meeting this requirement is presented, and yields diffraction-limited performance over the field of view at nine specific wavelength/zoom positions. Each zoom position, corresponding to a specific wavelength, has a focal length and f/number for achieving constant CCD sampling. The Strehl ratio of the telescope is greater than 90% over all zoom positions.

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Hyun Kyoung An and Stephen K. Pitalo "Diffraction-limited constant-resolution zoom lens across multi-wavelengths for the Advanced Technology Solar Telescope", Proc. SPIE 6342, International Optical Design Conference 2006, 63421L (18 July 2006); https://doi.org/10.1117/12.692300

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