Infrared multilayer interference filter manufacture: supposed longwave limit

Seeley, J. S.; Hunneman, Roger; Whatley, A.

doi:10.1364/ao.18.003368

Cited by 5 publications

(3 citation statements)

References 2 publications

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“…The heaviest compound within this group is lead telluride (PbTe) which was used extensively as high-index H-layers in the multilayer designs. PbTe as the high-index layer has been widely investigated over many years, principally due to its small bandgap thermoelectric and semiconductor properties in optoelectronic devices [15] , and provides various optical transparency and refractive index advantages compared with other Group IV coating materials [16] . The high refractive index [17] (n=5.5 at 295K) when used with an appropriate low-index II-VI dielectric results in a high index contrast to achieve the spectral filtering requirements with the minimum number of layers and to maximize the spectral throughput.…”

Section: Infrared Materials Propertiesmentioning

confidence: 99%

Infrared optical coatings for the EarthCARE Multispectral Imager

et al. 2014

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The Earth Cloud, Aerosol and Radiation Explorer mission (EarthCARE) Multispectral Imager (MSI) is a radiometric instrument designed to provide the imaging of the atmospheric cloud cover and the cloud top surface temperature from a sun-synchronous low Earth orbit. The MSI forms part of a suite of four instruments destined to support the European Space Agency Living Planet mission on-board the EarthCARE satellite payload to be launched in 2016, whose synergy will be used to construct three-dimensional scenes, textures, and temperatures of atmospheric clouds and aerosols. The MSI instrument contains seven channels: four solar channels to measure visible and short-wave infrared wavelengths, and three channels to measure infrared thermal emission. In this paper, we describe the optical layout of the infrared instrument channels, thin-film multilayer designs, the coating deposition method, and the spectral system throughput for the bandpass interference filters, dichroic beam splitters, lenses, and mirror coatings to discriminate wavelengths at 8.8, 10.8, and 12.0 μm. The rationale for the selection of thin-film materials, spectral measurement technique, and environmental testing performance are also presented.

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Section: Infrared Materials Propertiesmentioning

confidence: 99%

Infrared optical coatings for the EarthCARE Multispectral Imager

et al. 2014

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“…Absorption can also be influenced by the oxygen partial pressure (Hawkins et al 2000, Seeley et al 1979, 1980, Binet al 1997. High purity 5N materials are recommended with impurity levels of about 1 ppm.…”

Section: Sulfides Se/enides and Telluridesmentioning

confidence: 99%

“…Only ZnS molecules after recombination stick to the substrate (Goldfinger eta!. PbTe shows the highest refractive index of all evaporation materials (Hawkins et al 2000;Seeley et al 1979Seeley et al , 1980. ZnSe is used mainly for IR applications, e.g.…”

Section: Sulfides Se/enides and Telluridesmentioning

confidence: 99%