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Proceedings Paper

Thickness-dependent optical properties of metals and alloys applicable to TPF coronagraph image masks
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Paper Abstract

Some common metals and alloys have been identified as potential candidates with optical properties applicable to image plane masks for terrestrial planet finder (TPF) coronagraph especially for broad band performance in the visible spectrum. Thin films of these materials exhibit thickness dependence of refractive index and extinction coefficient which vary with wavelength and consequently the intensity and phase of transmitted light. We report on the fabrication and measurement of thickness-dependent optical properties of thin films of Ni, Pt and Inconel alloys to enable optimum design of image plane masks for Lyot coronagraphs to operate in the 500 to 800 nm band. We discuss the potential and limitations of practical masks with such materials.

Paper Details

Date Published: 19 September 2007
PDF: 11 pages
Proc. SPIE 6693, Techniques and Instrumentation for Detection of Exoplanets III, 66930Z (19 September 2007); doi: 10.1117/12.732721
Show Author Affiliations
Kunjithapatham Balasubramanian, Jet Propulsion Lab. (United States)
Daniel W. Wilson, Jet Propulsion Lab. (United States)
Richard E. Muller, Jet Propulsion Lab. (United States)
Brian D. Kern, Jet Propulsion Lab. (United States)
Erkin Sidick, Jet Propulsion Lab. (United States)


Published in SPIE Proceedings Vol. 6693:
Techniques and Instrumentation for Detection of Exoplanets III
Daniel R. Coulter, Editor(s)

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