Alluxa (Santa Rosa, CA) designs and manufactures next generation, hard-coated optical filters using the proprietary SIRRUS Plasma Deposition Process. The sophisticated coating process provides precision wavelength control and uniform coatings, even for large-format parts. It also permits production of the same high-performance optical filters over multiple coating runs and in multiple chambers.  Alluxa can produce thin-film coatings in a fraction of the time (compared to standard coating methods) and make automated adjustments to layer thicknesses and uniformity in real time – translating to higher performance and lower costs for our customers.

Our proprietary HELIX Spectral Analysis System has redefined measurement capabilities of high-performance thin-film optical filters to address the limitations of most commercially-available spectrophotometers. The system’s capabilities are four-fold: it is able to track filter edges to OD7 (-70 dB), evaluate blocking to OD9 (-90 dB), resolve edges as steep as 0.4% relative to edge wavelength from 90% transmission to OD7, and resolve passbands that are as narrow as 0.1 nm at full width half maximum (FWHM).

The company’s commitment to advanced metrology ensures that once coated, the performance of Alluxa optical filters is tested using state-of-the-art instruments. Optical filter transmission and blocking in the UV, VIS, and NIR are measured using one of the most advanced spectrophotometers on the market, and IR filters are measured using an FTIR spectrometer.

Alluxa’s unique, purpose-built deposition platform and control systems were designed, developed, and built by our in-house team to address the demanding requirements of the next generation of systems and instruments.  We continue to dedicate a large amount of resources to research and development to meet our goals of increasing production capability and continuing to provide > 99% on-time delivery while creating the world’s most challenging filters at breakthrough price points.

Founded in 2007, Alluxa is an ISO 9001:2015 certified, ITAR registered manufacturer of high-performance optical filters and thin-film coatings.



Alluxa's Hydrogen Alpha (H-alpha) Emission Line Filters have been specifically tailored to monitor H-alpha spectra in astronomy; they can also be used in any application where spectral line discrimination is critical, including spectroscopy, plasma monitoring, and fusion research.

At Alluxa, we are continually striving to improve our products by researching and developing novel thin-film technologies. Therefore, we welcome any custom optical filter requests for non-standard spectral shapes, unusual coating materials, tunable filters, extreme blocking, or any other challenging technical specifications.

Alluxa's ULTRA Series of high-reflectivity dielectric mirrors provide close to 100% reflection over a broad or precise range of wavelengths. Each hard coated, thin-film dielectric mirror is resistant to laser damage and all will boost instrument performance by preserving light source intensity.

The steep edges, maximum transmission, and maximum reflection of ULTRA Series thin-film dichroic filters all translate into minimal loss of light intensity and optimal instrument performance. Each ULTRA Series dichroic filter, polychroic filter, dichroic beamsplitter, or beam combiner is resistant to laser damage and can be designed to work at any angle. All are ideal for use in applications such as fluorescence microscopy, flow cytometry, and Raman spectroscopy.

The deep blocking, tight wavelength control, steep edges, and wide-range transmission of ULTRA Series thin-film notch filters all allow for precision blocking of lasers or other light sources, without sacrificing the quality of target signals.

Each hard-coated ULTRA Series optical notch filter is designed and rigorously tested to exceed the most advanced system requirements. They are all ideal for use in applications such as fluorescence microscopy, endoscopy, and DNA sequencing.

With the narrowest bandwidths and highest transmission in the industry, Alluxa’s thin-film, ultra-narrow bandpass filters will optimize the performance of laser-based systems.

Alluxa offers a variety of hard-coated ULTRA Series excitation filters and emission filters specified with tight wavelength control, steep edges, high transmission, and greater than OD6 blocking to increase signal-to-noise ratios and improve qPCR efficiency. Available dichroic filters are specified with steep edges, high transmission, and high reflection.

The ULTRA Series optical filters and coatings are specifically designed to be integrated into the most sophisticated instruments used in biotechnology, remote sensing, telecommunications, chemical engineering, robotics, and a variety of other fields.

Through a combination of precision wavelength control, ultra-steep edges, deep blocking, and the industry's highest transmission levels, Alluxa’s ULTRA Series of hard-coated, thin-film optical bandpass filters will optimize the performance of a variety of instruments.


Alluxa, Inc.

3660 N. Laughlin Road

Santa Rosa, CA 95403


Phone: +1 855-425-5892

Contact: Peter Egerton, CCO


  • The concept of surface flatness and wavefront error in the context of optical components is explained, including how these properties are measured, defined, and how they impact optical performance.

  • Cone half angle (CHA) measures the degree of convergence or divergence in an incident beam, with a 0˚ CHA indicating collimated light and larger angles indicating more pronounced convergence or divergence.

  • The relationship between angle of incidence (AOI) and polarization is explained, with a focus on how AOI affects the transmission and reflection of light.

  • Optical filters selectively transmit light in a particular range of wavelengths. The spectral features of optical filters are important for selecting the right filter for a particular application.

  • The COVID-19 pandemic has necessitated rapid and accurate quantitative analysis of dangerous pathogens. The “gold standard” for DNA detection today is quantitative polymerase chain reaction (qPCR). In this article, learn how thin film optics play a role in DNA detection.

  • Alluxa’s proprietary high-speed plasma deposition technology delivers, for the first time, the optical performance and durability of hard-coated thin film optical filters at laminated soft coating prices.

  • Alluxa’s thin film optical filter technology has advanced to the point where the spectral slopes and blocking levels are challenging even the best metrology equipment and techniques. This paper discusses challenges and provides solutions for measuring the spectral response of this new class of high-performance filters.

  • Alluxa’s new class of ultra-narrow filters are designed for applications such as laser cleanup, lidar, telecommunications, and instrumentation. They also offer the narrowest and “squarest” filter profiles in the visible and NIR, as well as transmission levels that approach 100%.

  • These filters are unique because they achieve flatness by eliminating the high stresses of a deposited traditional ion-based coating process such as ion beam sputtering (IBS) and ion assisted deposition (IAD). 

  • This paper defines major filter types and discusses how to specify key attributes while also optimizing cost. The filter types discussed include band pass types of ultra-square high cavity count, ultra-narrow and soft coating replacements, and dichroic and polychroic tilted beamsplitter filters.

  • Alluxa’s new precision infrared bandpass and dual bandpass filter technology brings new levels of performance with higher transmissions, steeper slopes, and flatter pass bands than traditional evaporated coatings.

  • Narrowband filters are a critical technology for lidar, laser cleanup, chemical and gas sensing, and more. Because creating multicavity filters is a challenge for deposition process control systems, Alluxa uses a computer-controlled variation on the turning point method of thickness control for each individual layer.

  • Hard coated ultra-narrowband optical filters made using modern plasma processes offer much improved transmission, temperature stability and out of band blocking as compared to legacy soft coatings. These filters are used in optical systems as diverse as LIDAR (light detection and ranging), Doppler shift detection of plasma velocity, laser cleanup, chemical and gas sensing, as well as for cutting-edge astronomy and instrumentation applications.

  • Fluorescence-based systems have revolutionized the way organisms, cells, and biomolecules are visualized and detected. However, challenges common to these instruments, such as bleed-through, background autofluorescence, and poor signal-to-noise ratios, can reduce performance. 

  • Advances in thin-film technology have led to new classes of multiband filters that redefine performance standards and drive innovation. By understanding their scientific and industrial applications, various filter classes and manufacturing possibilities are also better understood.

  • Bio-imaging and detection techniques that use non-linear optical (NLO) phenomena have led to great advancements, such as super-resolution images, label-free visualization of naturally occurring biomolecules, and greater freedom for working with in-vivo samples. This white paper discusses the importance of choosing thin-film optical components for NLO systems to ensure optimal signal strength, resolution, and image quality.

  • LIDAR is used for obstacle avoidance in autonomous vehicles, urban planning, security, infrastructure development, and other applications. This application note details how high-performance, ultra-narrow bandpass interference filters improve LIDAR signal-to-noise ratios in specific applications.

  • The HELIX Spectral Analysis System has redefined measurement capabilities of high performance thin-film optical filters. HELIX is an instrument designed and developed by Alluxa Engineering staff to address the limitations of most commercially available spectrophotometers.

  • This article defines a number of glossary terms related to thin film optical filters and their use.

  • Used across a variety of biological disciplines, fluorescence-based flow cytometers rapidly and accurately quantify cells and cellular components. As one of the most important components of these systems, flow cytometry filters must be specifically designed to maximize signal-to-noise ratios while minimizing crosstalk between fluorophores.


  • Alluxa, Inc. announces the development of two groundbreaking Hydrogen Alpha (H-alpha) Emission Line Filters for astronomy applications. Alluxa’s novel H-alpha filters are revolutionizing the ultra-narrow optical filters market.

  • Alluxa, Inc., a global leader in high-performance optical coatings and filters and thin-film deposition technologies, announces the expansion of the online product catalog featuring hard-coated specialty filters with extended wavelength ranges from the ultraviolet (UV) to infrared (IR). Alluxa will be showcasing the new catalog optical filters during SPIE Defense + Commercial Sensing at Gaylord Palms Resort & Convention Center, Orlando, FL, April 5 - 7, 2022, in booth #1525.

  • Alluxa, Inc., a global leader in high-performance optical coatings and filters and thin-film deposition technologies, announces the promotion of Amber Czajkowski to the position of Director of Product Management, effective immediately. Ms. Czajkowski will be responsible for applications and product engineering.

  • Alluxa’s proprietary SIRRUSPlasma Deposition platform offers breakthrough high performance and full spectral coverage from 200 nm to 14 µm.

  • Alluxa, Inc., a global leader in high-performance optical coatings and filters and thin-film deposition technologies, is pleased to announce the appointment of Jacob Jaramillo to the position of director of sales operations.

  • The company’s unique multi-band optical filter design is integral to Texas A&M’s Exoplanet Transmission Spectroscopy Imager (ETSI) instrument.

  • Alluxa’s optical filters, specially designed for the advanced fluorescence spectrometer on the Mars Perseverance Rover, landed safely on Mars, on February 18, 2021.

  • Alluxa, Inc., a global leader in high-performance optical coatings and filters and thin-film deposition technologies, announces an online catalog of fluorescence filters developed for use in COVID-19 testing devices.  The ULTRA SERIES – Fluorescence Filter Sets are specifically designed for real-time qPCR (polymerase chain reaction) applications.

  • Alluxa, Inc., the global leader in high-performance optical coatings and filters, has extended its industry-leading Ultra Series to include high-performance polymerase chain reaction (PCR) specific filters. These filters were developed with higher performance optical characteristics and are intended to improve speed and efficiency of real time qPCR testing for the SARS-CoV-2 virus. The new Ultra Series qPCR product family includes real-time, qPCR-specific filters for integration into medical equipment that performs COVID-19 testing of patient samples.

  • Alluxa, Inc., a global leader in high-performance optical coatings and filters and thin-film deposition technologies, introduces a breakthrough 10.6 µm infrared (IR) notch filter with optical density > 4.0 (OD4). The innovative, high-layer-count IR optical coating is produced by utilizing Alluxa’s proprietary deposition capabilities that now deliver groundbreaking optical coating performance in the 8 µm to 12 µm spectral range.

  • Alluxa, Inc., a global leader in thin-film deposition technology and high-performance optical coatings and filters, is pleased to announce Bill Kastanis as the new vice president of operations, effective immediately. A highly-respected veteran in optics and photonics, Bill has over 35 years of experience in operations, vacuum deposition, and factory automation.

  • Alluxa, Inc., a global leader in high-performance optical filters and optical coatings, is pleased to announce the promotion of Kevin Nolen to director of engineering, effective immediately.  Kevin has served in a variety of engineering and operations roles at Alluxa for more than 12 years. He will be responsible for guiding and executing Alluxa’s developmental engineering efforts that support factory automation, deposition process improvements, and product engineering projects. Kevin has a BS ME from California State University, Chico.

  • Alluxa’s proprietary SIRRUS™ PVD platform offers breakthrough high performance and full spectral coverage from 200 nm to 14 μm.