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.
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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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