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Reynard has announced the addition of polished and coated indium arsenide (InAs) to its list of manufacturing capabilities.

InAs combines the refractive index profile of silicon with a short-wavelength blocking range broader than germanium.

Reynard routinely manufactures InAs windows with surface qualities approaching 10-5 per MIL-PRF-13830.

Substrates can be coated and verified to meet any customer spectral requirement from room temperature to 80K.

Coatings are routinely verified to pass the adhesion, humidity, and moderate abrasion requirements of MIL-C-48497A.

Transmission edge is 3.1um at 80K (cryogenic) and 3.8um at 298K (room temperature); refractive index is comparable to silicon in the 3-5um and 8-12um spectral bands; complete blocking below 3.0um due to natural material absorption.

Applications include: cryogenic filters for remote sensing; laser limiter; and infrared imaging, single band and multi-band.

Reynard said the benefit of InAs is that it enables infrared optical system designers to explore the trade space between improved system performance and allowable manufacturing tolerances.

The extended blocking range offered by InAs enables the production of high-performance, fully-blocked filters in the 3-5um and 8-12um spectral bands.

In comparison with classical approaches, InAs based thin-film coatings require fewer layers to meet out-of-band blocking specifications while maintaining good in-band transmission.

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