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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 ,
R. U. Dada  and
L. M. Hanssen
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
Information
MRS Online Proceedings Library (OPL) , Volume 374: Symposia ZB – Materials for Optical Limiting , 1994 , 117
Copyright
Copyright © Materials Research Society 1995

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