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Proceedings Paper

Ultrathin film neutral density filter set for the infrared
Author(s): Glenn Lefever-Button; Joakim F. Lindblom; Forbes R. Powell
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Paper Abstract

A set of neutral density filters covering the optical density range of OD 1 through OD 10 has been designed and constructed for use as calibration and reference filters in the infrared. The filters are optically flat, with a variation of at most one OD within the spectral range of 2 micrometer to 25 micrometer. Many filters exhibit better than 0.5 OD variation. They each are constructed of a metallic film supported by an ultrathin (100 nm) polyimide film substrate that minimizes the chance of etaloning within the filter. The polyimide substrate is sufficiently robust to withstand handling in a laboratory environment and provide long-lived performance. This paper details the theoretical model used to determine appropriate materials for these filters, as well as the vacuum deposition processes developed to construct them.

Paper Details

Date Published: 8 October 1998
PDF: 9 pages
Proc. SPIE 3425, Optical Diagnostic Methods for Inorganic Transmissive Materials, (8 October 1998); doi: 10.1117/12.326680
Show Author Affiliations
Glenn Lefever-Button, Luxel Corp. (United States)
Joakim F. Lindblom, Lindblom Scientific (United States)
Forbes R. Powell, Luxel Corp. (United States)

Published in SPIE Proceedings Vol. 3425:
Optical Diagnostic Methods for Inorganic Transmissive Materials
Raju V. Datla; Leonard M. Hanssen, Editor(s)

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