Optical Filters

OPTICAL FILTERS WHITE PAPERS AND CASE STUDIES

Specifying Surface Figure And Wavefront Distortion For Multi-layer Optical Filters
Specifying Surface Figure And Wavefront Distortion For Multi-layer Optical Filters
This white paper helps the reader understand where, when, how, and how much to specify wavefront distortion to ensure that functional requirements of filters are guaranteed while unnecessary and costly constraints are avoided.  Continue Reading..
Large-Format, Narrow Band Pass Filters (NBPF) – A Uniformity Challenge
Large-Format, Narrow Band Pass Filters (NBPF) – A Uniformity Challenge
Within so many diverse optical filtering applications, large-format (>100 mm diameter), narrow bandpass filters (NBPF) are required to be used alongside large collection optics in order to facilitate specific and selective analysis of a phenomena or the substance of interest.  Continue Reading..
Specifying Optical Filters for Sensor Applications
Each sensor application has its own subtleties that need to be addressed in order to choose the appropriate optical filters for each sensing task. This application note discusses the critical parameters for bandpass filters that are to be used for sensor applications, including considerations on in-band transmission, band edge placement, and out-of-band blocking.  Continue Reading..
Using Next-Generation Thin-Film Optical Filters For Fluorescence Imaging And Detection Systems
Using Next-Generation Thin-Film Optical Filters For Fluorescence Imaging And Detection Systems
Within any fluorescence application, there are three basic filters that are needed for operation – the excitation filter, the emission filter, and the beamsplitter. This white paper further discusses the use of Alluxa’s thin-film optical filters in fluorescence imaging and detection systems.  Continue Reading..
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Enhancing Endoscopy With Optical Filters
While white-light reflectance (WLR) imaging has become the standard for in vivo diagnosis using “conventional endoscopy,” this white paper details three alternatives — or supplements — to WLR that leverage the wavelength selectivity provided by optical filters.  Continue Reading..
BOROFLOAT® & Optical Mirrors: A Union of Inspiration & Quality
BOROFLOAT & Optical Mirrors: A Union of Inspiration & Quality
This white paper introduces BOROFLOAT, the world’s first borosilicate glass by SCHOTT, explains how it is used in the Hobby Eberly Telescope (HET), and describes its exceptional optical and thermal properties.  Continue Reading..
optical filters
Clear The Air: New Optical Filters For Sensors And Detectors
Environmental air quality; proximity control; crowd counting; climate change; the “Internet of Things”.  Our world has become an increasingly monitored place where the proliferation of sensors and detectors allows us, and our devices, to better understand and interact with our environments.    Continue Reading..

OPTICAL FILTERS PRODUCTS

Iridian Spectral Technologies offers LiDAR laser sensor systems with common laser wavelengths including 532 nm, 905 nm, 1064 nm, and 1550 nm. These filters provide more signal with less background and are ideal for laser sensor applications, including airborne laser scanning and other methods of capturing 3D data of large areas.

In astronomical observations, optical filters are able to provide the wavelength selectivity needed to enable telescopes to discriminate signal from background information. These filters often require larger sizes, higher uniformity, and excellent surface quality and surface figure.

Iridian offers over 20 years of experience in producing industry leading optical telecommunication and datacom filters for terrestrial systems. Commercial satcom networks will consist of constellations of 100’s to 1000’s of satellites in an interconnected low earth orbit (LEO) mesh. Many of these systems rely on an optical intersatellite link (OISL) architecture to connect satellites via laser based optical communications. Optical filters provide wavelength selectivity to these systems addressing different functional needs from solar rejection windows to beam steering wavelength selective dichroic filters.

DSI provides three specialized coating process technologies designed to accommodate the many demands placed on thin film coatings. Each process offers the ability to provide unique solutions, higher performance, increased volume, and much more durable coatings.

DSI offers its expertise on high quality testing capabilities for many types of resources such as in-house produced materials, as well as independent verification of external coated and uncoated samples for vendor/supplier surveillance, process analysis, and qualification testing. Each quality system is ISO 9001:2008 certified and ITAR registered and compliant. Environmental testing is also available and is performed in accordance with military specifications.

Abrisa Technologies offers a broad spectrum of glass machining services that can fit nearly every application-specific customer requirement. With CNC processing and other glass fabrication equipment, this company can manufacture a wide variety of glass parts ranging from simple to the most complex designs. Some of the offered processes performed in-house include notching, slotting, grooving, edge grinding, stepped surfaces, hole drilling, circle grinding, polishing, and sandblasting.

Acton Optics & Coatings offers bandpass, band rejection, long pass, neutral density, reflective, and solar blind filters for spectroscopy, elemental analysis, environmental monitoring, biotechnology instrumentation, space exploration, and in general research areas.

Iridian offers excitation, dichroic, and emission fluorescence spectroscopy filters for confocal microscopy, flow cytometry, and other biomedical applications. These dichroic (FLD) and emission (FLE) filters deliver more signals with less background noise, and are compatible with common excitation sources and fluorophores. They also feature high transmission and reflection levels, low ripple, steep edges, and deep blocking outside of the pass band.

OPTICAL FILTERS NEWS

  • Fiber Optics Can Do That?

    Rigid and flexible fiber optic image guides offer a powerful way to manipulate image planes and achieve remote viewing.

  • Hybrid Gain Flattening Filters In Optical Fiber Amplifiers

    Hybrid GFFs save space, simplify system layouts, cost less than a two-filter setup, and offer unparalleled reliability. Meet the new standard in optical fiber amplifier components.

  • What Is A UV Filter?

    A UV blocking filter or ultraviolet optical filter prevents ultraviolet light transmission. UV filters are commonly used in photography to reduce the level of ultraviolet light that strikes the recording medium.

  • What Is A Dichroic Filter?

    A dichroic filter, thin-film filter, or interference filter is a very accurate color filter used to selectively pass light of a small range of colors while reflecting other colors. By comparison, dichroic mirrors and dichroic reflectors tend to be characterized by the color(s) of light that they reflect, rather than the color(s) they pass.

  • What Is A Neutral Density Filter?

    A neutral density, or ND, optical filter reduces or modifies the intensity of all wavelengths or colors of light equally, therefore providing for no changes in the hue of the color rendition. Neutral density filters can be colorless or clear, or they can be grey in tone.

  • How To Measure Thin, Parallel Optics

    Thin, parallel optics are difficult to measure, because both front and back surfaces reflect light. Fourier- Transform Phase Shifting Interferometry can separate those reflections and provide more information than traditional methods. 

  • Remote Sensing With LiDAR Requires Optical Filter Trade-Offs

    Engineers and designers working on LiDAR applications should consider critical filter issues early on.

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