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Optical Filter Tutorials

  • How to Clean Optical Filters

    How to Clean Optical Filters?While the Iridian filters are hard coated filters, the filters are delicate and should be handled with care to avoid or minimize direct contact with any other optics. All Iridian filters may be cleaned using the following recommended method. 
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  • Specifying Surface Figure and Wavefront Distortion for Multi-layer Optical Filters

    Optical filters are used in many applications and the surface figure and wavefront distortion requirements of filters are dependent on where and how they are used. Whereas band-pass or clean-up functionality may only require control of the transmitted wavefront, dichroic beam-steering/splitting filters or wavelength selective mirrors likely require specification of both the transmitted and reflected […]
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  • How to specify a filter

    The optical filter specifications required will depend on the filter application and how it is to be used. In general, typical filter optical specifications will include the wavelength ranges over which to reflect and transmit light, angle of incidence tuning range,clear aperture of the filter, the polarization state of light for non-normal angles of incidence, […]
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  • Edge Filters for Raman Spectroscopy

    Raman Spectroscopy Raman spectroscopy probes the molecular vibrational and rotational modes of a material in order to detect and identify the material. Laser light is incident upon the material and the scattered light is measured. The excitation source laser intensity is often 6 to 8 orders of magnitude greater than the Raman scattered signal. Therefore, […]
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  • Gain Flattening Filter (GFF) Tutorial

    Gain Flattening Filter (GFFs), also known as gain equalizing filters, are used to flatten or smooth out unequal signal intensities over...
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  • Tap Coupler – Beamsplitter Tutorial

    Tap couplers filters and beamsplitters are used to reflect a specific percentage of incident light over a broad wavelength range and for a specified angle of incidence. Beamsplitters and tap couplers can be specified...
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  • CWDM Filter Tutorial

    Coarse Wavelength Division Multiplexing (CWDM) filters are designed to multiplex and de-multiplex wavelength signals in metropolitan, access and enterprise networks and for Cable TV applications. In addition...
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  • Linear Transmittance Filter Tutorial

    Linear Transmittance Filter (LTF) has a transmittance that is changing linearly over a specified wavelength range. LTFs are typically used for...
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  • Single Cavity Filter Tutorial

    The Single Cavity Filter (SCF) is used to select a single frequency from a broad spectral range. SCFs are typically used for...
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  • Etalon Tutorial

    A Solid Etalon Filter (SEF) is used to select a periodically spaced frequency grid from a broad spectral range. The key specifications
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  • Band Pass Filter Tutorial

    Band Pass Filters (BPFs) are used to pass (transmit) a range of wavelengths and to block (reflect) other wavelength on either side of the bandpass. The region of high transmittance is known...
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