Optical Filters White Papers and Case Studies

  1. Large-Format, Narrow Band Pass Filters (NBPF) – A Uniformity Challenge
    1/27/2017

    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.

  2. Specifying Optical Filters for Sensor Applications
    7/1/2016

    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.

  3. Using Next-Generation Thin-Film Optical Filters For Fluorescence Imaging And Detection Systems
    5/23/2016

    Within any fluorescence application, there are three basic filters that are needed for operation – the excitation filter, the emission filter, and the beamsplitter. Hard-coated, thin-film optical filters are the best choice for these filters in that they provide the highest standards such as improvements in transmission, blocking, and both transmitted and reflected wavefront properties, which translates into bright, high-contrast images, and accurate detection of target molecules in fluorescence applications. This white paper further discusses the use of Alluxa’s thin-film optical filters in fluorescence imaging and detection systems.

  4. Enhancing Endoscopy With Optical Filters
    10/30/2015

    Endoscopic examination is a key technique used to diagnose early-stage neoplastic lesions associated with stomach and other gastrointestinal cancers. 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:  narrow-band imaging (NBI), auto-fluorescence imaging (AFI), and endoscopic Raman spectroscopy. 

  5. BOROFLOAT & Optical Mirrors: A Union of Inspiration & Quality
    6/19/2015

    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.

  6. Clear The Air: New Optical Filters For Sensors And Detectors
    4/2/2015

    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.  

  7. Metal-Mesh Optical Filter Technology for Mid-IR, Far-IR, Terahertz and Submillimeter Ranges
    7/6/2012

    Metal-mesh filters are used to selectively filter far-infrared radiation before it reaches a detector. Metal mesh filters improve detection capabilities through blocking out-of-band interferences, can improve the performance of lower-end detectors, improve signal-to-noise ratio (SNR), and much more. They are ideal for increasing system performance for astronomical spectroscopy and space-based applications. This article discusses the benefit over using metal-mesh filters in the mid-to-far infrared spectral range over multilayer thin film dielectric filters, and band pass filters.