Reflective coating of 834 [angstrom] for imaging O[sup +] ions

Journal Article · Tue Feb 01 04:00:00 EST 1994 · Optical Engineering; (United States)

OSTI ID:5094499

Chakrabarti, S ^[1]; Edelstein, J ^[2]; Keski-kuha, R A.M.; Threat, F T ^[3]

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1. Boston Univ., MA (United States). Center for Space Physics
2. Univ. of California, Berkeley, CA (United States). Space Sciences Lab.
3. NASA Goddard Space Flight Center, Greenbelt, MD (United States)

Imaging upflowing O[sup +] ions of ionospheric origin and plasma-spheric O[sup +] can be achieved through solar resonance scattering at 834 [angstrom]. Unfortunately, several strong background emissions, including the ones at 1,025 and 1,216 [angstrom] due to geocoronal hydrogen atoms, pose serious problems. Most common optical coatings have higher reflectivity at 1,025 and 1,216 [angstrom] than at 834 [angstrom]. After examining a number of options, they have designed a multiple-layer coating that selectively reflects 834-[angstrom] radiation and suppresses 1,025- and 1,216-[angstrom] radiation. The structure of the coating material consists of a very thin (50 to 150 [angstrom]) metal (nickel) layer on top of a semitransparent dielectric material (magnesium fluoride) over an aluminum substrates. Three such coatings were product at NASA Goddard Space Flight Center using an existing coating facility that is not optimized for thin coatings. In spite of such fabrication difficulties, they have obtained encouraging results.

• OSTI ID: 5094499
• Journal Information: Optical Engineering; (United States), Journal Name: Optical Engineering; (United States) Vol. 33:2; ISSN 0091-3286; ISSN OPEGAR
• Country of Publication: United States
• Language: English

Related Subjects

661320* -- Auroral
Ionospheric
& Magnetospheric Phenomena-- (1992-)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CATIONS
CHARGED PARTICLES
COATINGS
DESIGN
EARTH ATMOSPHERE
EARTH MAGNETOSPHERE
EMISSION SPECTRA
FILTERS
ION DRIFT
IONIC COMPOSITION
IONOSPHERE
IONS
MEASURING INSTRUMENTS
OPTICAL FILTERS
OXYGEN IONS
PLANETARY IONOSPHERES
REFLECTIVE COATINGS
REMOTE SENSING
SPECTRA