Iridian Articles

  1. Frequently Asked Questions: Optical Thin Film Filters
    12/11/2017

    This article answers an array of frequently asked questions about optical thin film filters. It provides in-depth information on what they are, how they are created, how they perform, and what to look for when selecting an optical thin film filter supplier.

  2. The Eyes Of The Instruments: Using Optical Filters To Observe And Measure Earth From A Different Perspective
    9/6/2017

    An improved ability to manage or understand the natural or influenced phenomena is critical to ensuring that we maintain a healthy planet capable of sustaining humanity as part of its diverse bio-mass. But understanding these phenomena and how they are changing over time requires measurement.

  3. Understanding Edge Filters For Raman Spectroscopy
    5/8/2017

    Since the excitation source laser intensity is often six to eight orders of magnitude greater than the Raman scattered signal, edge pass filters are required to block the wavelength of the scattered laser beam while transmitting the wavelength shifted Raman scattered signal.

  4. 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.

  5. 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. 

  6. Optical Filters: Right In Front Of Your Eyes
    6/29/2015

    Continued improvements in multilayer thin film filter (TFF) design and manufacturing methods — such as in-situ optical monitoring and automated coater control with dynamic design adjustment — have enabled successful production of optical filters with increasing control over the spectral shape. 

  7. 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.  

  8. Optical Filters For Raman Analysis: Finding The Needle In The Haystack
    1/9/2015

    Most Raman microscopy applications seek to maximize access to the Raman fingerprint of the molecule of interest, requiring filters that provide “more signal with less background.” This article discusses optical filters for Raman analysis, addressing filters for both bench-top and portable Raman applications.