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Spectral design of temperature-invariant narrow bandpass filters for the mid-infrared

Stolberg-Rohr, T. and Hawkins, G. J. (2015) Spectral design of temperature-invariant narrow bandpass filters for the mid-infrared. Optics Express, 23 (1). pp. 580-596. ISSN 1094-4087

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To link to this item DOI: 10.1364/OE.23.000580


The ability of narrow bandpass filters to discriminate wavelengths between closely-separated gas absorption lines is crucial in many areas of infrared spectroscopy. As improvements to the sensitivity of infrared detectors enables operation in uncontrolled high-temperature environments, this imposes demands on the explicit bandpass design to provide temperature-invariant behavior. The unique negative temperature coefficient (dn/dT<0) of Lead-based (Pb) salts, in combination with dielectric materials enable bandpass filters with exclusive immunity to shifts in wavelength with temperature. This paper presents the results of an investigation into the interdependence between multilayer bandpass design and optical materials together with a review on invariance at elevated temperatures.

Item Type:Article
Divisions:Science > School of Mathematical, Physical and Computational Sciences > Department of Computer Science
ID Code:38985
Publisher:The Optical Society (OSA)


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