Refractive Field Correctors For The Starlab Ultraviolet Telescope

Murk Bottema

doi:10.1117/12.933494

16 November 1982 Refractive Field Correctors For The Starlab Ultraviolet Telescope

Murk Bottema

Proceedings Volume 0331, Instrumentation in Astronomy IV; (1982) https://doi.org/10.1117/12.933494
Event: 1982 Astronomy Conferences, 1982, Tucson, United States

Abstract

Field correctors for a one-meter, f/15 cassegrainian telescope were designed as part of a NASA-funded study of an astronomical observatory on board of the space shuttle. By means of a Gasgoigne corrector and a biconcave field flattener, astigmatism and field curvature are corrected in a 0.6° field. Applicable wavelength ranges are limited by chromatic aberrations. The upper wavelength is selected to match a photocathode response limit. The lower wavelength limit is defined by a filter. Examples of usable wavelength ranges are: 210 nm - 1100 nm (multialkali photocathode, fused-silica corrector elements), 177 nm -320 nm (cesium telluride photocathode, calcium fluoride correctors); and possibly 134 nm -133 nm (cesium iodide photocathode, lithium fluoride correctors). Residual rms lateral color is smaller than 0.02 arc sec, and axial color is smaller than 0.25 arc sec (blur diameter at the ends of the wavelength range). The correctors introduce a small amount of coma. This is compensated by adjustment of the conic constants of the telescope mirrors.

Citation Download Citation

Murk Bottema "Refractive Field Correctors For The Starlab Ultraviolet Telescope", Proc. SPIE 0331, Instrumentation in Astronomy IV, (16 November 1982); https://doi.org/10.1117/12.933494

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