Imaging performance of telescope mirrors for far-ultraviolet astronomy.

Imaging performance of telescope mirrors for far-ultraviolet astronomy. Research Abstract Details 

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Imaging performance of telescope mirrors for far-ultraviolet astronomy. Abstract Text:

We describe image testing, surface metrology, and modeling of telescope mirrors (0.5 m in diameter, f/4.3) for the Far Ultraviolet Spectroscopic Explorer (FUSE) satellite. Laboratory image testing of wavelengths in the visible, vacuum, and midultraviolet validated a theoretical analysis by use of the Optical Surface Analysis Code (OSAC). Our modeling is based on surface metrology, including measurements of figure, midfrequency error, and microroughness. This combination of metrology, out-of-band performance testing, and modeling verified that the mirrors would meet mission requirements. We use OSAC to predict the FUSE telescope's far-ultraviolet (90-120-nm) point-spread function and assess its effect on instrument efficiency. The mirrors have a 90% encircled energy diameter of 1.5 arc sec at lambda = 100 nm. Including the effects of spacecraft pointing error, the mirrors have a predicted average slit transmission at lambda = 100 nm of approximately 87% and 96% for the 1.25- and 4-arc sec-wide spectrograph slits, respectively, where the required transmissions are 50% and 95%.

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Imaging performance of telescope mirrors for far-ultraviolet astronomy. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Applied optics

VOLUME: 39

Page Numbers: 4513-23

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ISSN: 0003-6935

DAY: 1

MONTH: Sep

YEAR: 2000

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LANGUAGE: eng

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