Determination of the embedded thermo-optical expansion coefficients of PbTe and ZnSe thin film infrared multilayers

Hawkins, Gary; Stolberg-Rohr, T.

doi:10.1364/oe.23.016348

Cited by 4 publications

(4 citation statements)

References 19 publications

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“…Ge index variation was fitted giving = 4.91E -4 , close to reported bulk values [12]. Applying this values to model of filter gave temperature dependence of CWL of 0.244 nm/°C, exceeding measured value of 0.139 nm/°C, implying that the embedded is even lower than single layer result [13].…”

Section: Resultssupporting

confidence: 67%

Microwave Plasma Assisted Magnetron Sputtering of Infrared Multilayer Thin Film Bandpass Filters for application in non-dispersive infrared gas sensors

Pomfret

Gibson

Fleming

et al. 2022

Optical Interference Coatings Conference (OIC) 2022

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Section: Resultssupporting

confidence: 67%

Microwave Plasma Assisted Magnetron Sputtering of Infrared Multilayer Thin Film Bandpass Filters for application in non-dispersive infrared gas sensors

Pomfret

Gibson

Fleming

et al. 2022

Optical Interference Coatings Conference (OIC) 2022

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“…Currently, it dominates the material selection for the design of infrared thin-film interference filters operating in the long wavelength infrared both at room and reduced temperature. The combination of its high index (above 5.5 in the spectral range of long wavelength infrared at room temperature) and its advantage of a negative temperature coefficient of refractive index (À2.0 Â 10 À3 K À1 ) make it much superior to other infrared coating materials [11][12][13][14][15][16][17].…”

Section: Properties and Applications Of Pbtementioning

confidence: 99%

Infrared High-Index Coating Materials, PbTe and Pb1−xGexTe: Properties and Applications

Li¹,

Xie²,

Zhang³

et al. 2019

Coatings and Thin-Film Technologies

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The greater value of refractive index for high-index layers in thin-film interference filters operating in the infrared has an incomparable advantage. Lead telluride (PbTe), which is much superior to other infrared high-index coating materials due to its high index and advantage of fundamental absorption edges, has played an important role in filters employed in the infrared radiometer and other instruments launched in space atmosphere sounding research projects. In this chapter, we summarized some recent achievements in the investigations into another infrared high-index coating material-lead germanium telluride (Pb 1Àx Ge x Te), a pseudo-binary alloy of PbTe and GeTe. It can be revealed that the layers of Pb 1Àx Ge x Te exhibit the tunable optical properties, such as temperature coefficient of refractive index and fundamental absorption edge, as well as mechanical properties, such as the hardness and Young's modulus, corresponding to its intrinsic ferroelectric phase transition. Some important applications in thin-film interference filters were also demonstrated for its tremendous potential, such as a stable narrow bandpass interference filter without temperature-induced wavelength shift and a tunable infrared short wavelength cutoff filter. Furthermore, it is also revealed that electron beam evaporation is a more effective congruent-transfer technique to deposit the layers of Pb 1Àx Ge x Te.

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“…These designs are especially constructed to generate alternate layer expansion coefficients that add up to zero. We have also performed research for the development of temperature-invariant behaviour in uncooled and high-temperature (20-200 °C) applications [27,28] .…”

Section: Temperature-invariant Narrow Bandpass Filtersmentioning

confidence: 99%

Cooled optical filters forQ-band infrared astronomy (15-40 μm)

et al. 2016

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With a growing interest in mid-and far-infrared astronomy using cooled imaging and spectrometer instruments in highaltitude observatories and spaceflight telescopes, it is becoming increasingly important to characterise and assess the spectral performance of cooled multilayer filters across the Q-band atmospheric window. This region contains spectral features emitted by many astrophysical phenomena and objects fundamental to circumstellar and planetary formation theories. However extending interference filtering to isolate radiation at progressively longer wavelengths and improve photometric accuracy is an area of ongoing and challenging thin-film research. We have successfully fabricated cooled bandpass and edge filters with high durability for operation across the 15-30 μm Q-band region. In this paper we describe the rationale for selection of optical materials and properties of fabricated thin-film coatings for this region, together with FTIR spectral measurements and assessment of environmental durability.

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Determination of the embedded thermo-optical expansion coefficients of PbTe and ZnSe thin film infrared multilayers

Cited by 4 publications

References 19 publications

Microwave Plasma Assisted Magnetron Sputtering of Infrared Multilayer Thin Film Bandpass Filters for application in non-dispersive infrared gas sensors

Microwave Plasma Assisted Magnetron Sputtering of Infrared Multilayer Thin Film Bandpass Filters for application in non-dispersive infrared gas sensors

Infrared High-Index Coating Materials, PbTe and Pb1−xGexTe: Properties and Applications

Cooled optical filters forQ-band infrared astronomy (15-40 μm)

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