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Quality Digest


Plasma-Deposition Process Offers Extended Spectral Performance for Optical Filters

Breakthrough high performance and full spectral coverage from 200 µm to 14 µm

Published: Thursday, February 10, 2022 - 12:59

(Alluxa: Santa Rosa, CA) -- Alluxa, a global leader in high-performance optical coatings and filters and thin-film deposition technologies, has introduced a groundbreaking capability in extending spectral optical-coating performance. The SIRRUS plasma physical vapor deposition (PVD) platform now offers full spectral coverage from ultraviolet (200 µm) to infrared (14 µm). The proprietary process enables optical filters with the steepest edges, highest transmission, and deepest blocking available while maintaining high-performance, precision wavelength control, and uniform coatings.

The extended spectral performance is available on a variety of Alluxa’s optical filters, including ultra-narrow bandpass filters; bandpass filters; and dichroic, notch, and multiband filters. The UV to mid-IR coatings can also be deposited on various substrate shapes and sizes as well as on large-format parts. Other SIRRUS PVD features include high-volume output, quick turn manufacturing of new designs, and high layer counts that deliver the highest possible spectral performance.

Alluxa’s chief commercial officer Peter Egerton notes, “We are excited to announce this new optical-coating technology with advanced UV-IR spectral-management capabilities for our customers. We’ve had our SIRRUS plasma-deposition process for some time, but this next-generation plasma PVD highlights our advanced capability in the extended spectrum, from 200 µm to 14 µm range, and to our commitment to high-performance thin-film filters and complex optical solutions.”

About Alluxa

Alluxa designs and manufactures hard-coated optical filters using a proprietary plasma-deposition process. The company’s purpose-built deposition platform and control systems were designed, developed, and built by the Alluxa team to address the demanding requirements of the next generation of systems and instruments. The company’s objectives are to increase production capability and continue to provide greater than 99-percent on-time delivery while creating the world’s most challenging filters at breakthrough price points.


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