A hot electrons-based wide spectrum on-orbit optical calibration source

Details A hot electrons-based wide spectrum on-orbit optical calibration source A hot electrons-based wide spectrum on-orbit optical calibration source

Jan 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aipc..420..648s&link_type=abstract

Space technology and applications international forum - 1998. AIP Conference Proceedings, Volume 420, pp. 648-653 (1998).

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Spaceborne And Space Research Instruments, Apparatus, And Components, Light-Emitting Devices

Scientific paper

Presently, no optical solid-state sources are available for the entire spectral range of NUV-VIS-NIR. Lamps still used for optical calibration are heavy and thermally and mechanically unstable, consume high electrical power, and have a short lifetime. Recently developed silicon carbide (SiC) based pre-breakdown light emitting diodes (LEDs) have numerous advantages over the hot filament lamps, including lack of current dependence, similarity to the solar spectrum, high thermal and temporal stability, mechanical and radiation strength, long lifetime, and miniature size. Unfortunately, the UV part of the optical emission created in the Al-SiC LED barrier is absorbed by the bulk silicon carbide wafer. Pre-breakdown electroluminescence devices from GaN films grown on sapphire offer a new approach to developing wide spectrum optical calibration sources. In contrast to SiC, GaN-based devices should exhibit a higher efficiency and a significant extension of the optical emission spectrum into the UV region. The nitride group at UH/SVEC has recently demonstrated GaN thin films with excellent surface morphology, good optical and electrical characteristics. In this paper we will describe our preliminary results from prebreakdown electroluminescence in Schottky barrier diode structures and discuss their employment in highly stable and compact optical calibration sources for space applications.

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