Ultrathin film neutral density filter set for the infrared

Glenn Lefever-Button; Joakim F. Lindblom; Forbes R. Powell

doi:10.1117/12.326680

8 October 1998 Ultrathin film neutral density filter set for the infrared

Glenn Lefever-Button, Joakim F. Lindblom, Forbes R. Powell

Proceedings Volume 3425, Optical Diagnostic Methods for Inorganic Transmissive Materials; (1998) https://doi.org/10.1117/12.326680
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

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.

Citation Download Citation

Glenn Lefever-Button, Joakim F. Lindblom, and Forbes R. Powell "Ultrathin film neutral density filter set for the infrared", Proc. SPIE 3425, Optical Diagnostic Methods for Inorganic Transmissive Materials, (8 October 1998); https://doi.org/10.1117/12.326680

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