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

  • Thomine Stolberg-Rohr, Gary J. Hawkins
  • Optics Express, January 2015, Optical Society of America (OSA)
  • DOI: 10.1364/oe.23.000580

Temperature-Invariant Behaviour of Bandpass Filters

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.

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.


Dr Gary J Hawkins
University of Reading

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.

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The following have contributed to this page: Dr Gary J Hawkins