What is it about?
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.
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Why is it important?
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.
Perspectives
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.
Dr Gary J Hawkins
University of Reading
Read the Original
This page is a summary of: Spectral design of temperature-invariant narrow bandpass filters for the mid-infrared, Optics Express, January 2015, Optical Society of America (OSA),
DOI: 10.1364/oe.23.000580.
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