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Development of Neutral-Density Infrared Filters Using Metallic Thin Films

Published online by Cambridge University Press:  15 February 2011

Z. M. Zhang
Affiliation:
National Institute of Standards and Technology, Gaithersburg, Maryland
R. U. Dada
Affiliation:
National Institute of Standards and Technology, Gaithersburg, Maryland
L. M. Hanssen
Affiliation:
National Institute of Standards and Technology, Gaithersburg, Maryland
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Abstract

Broadband infrared filters with uniform spectral transmittance are used for spectrometer calibration and other applications. However, commercially available neutral-density filters with optical density (GD) greater than 2 exhibit significant variations in OD over the wavelength region from 2 μm to 25 μ m. In this work, we found a single-layer alloy film that, for appropriate thicknesses, yields a flat transmittance for OD near 3 and 4. The transmittance and reflectance of the filters were measured using a Fourier-transform infrared spectrometer. The optical constants of the alloy films were obtained from transmittance and reflectance measurements, which can be used for future design optimization.

Type
Research Article
Copyright
Copyright © Materials Research Society 1995

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