- 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, […]
Continue Reading... - 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, […]
Continue Reading... - 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...
Continue Reading... - 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...
Continue Reading... - 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...
Continue Reading... - 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...
Continue Reading... - 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...
Continue Reading... - Etalon Tutorial
A Solid Etalon Filter (SEF) is used to select a periodically spaced frequency grid from a broad spectral range. The key specifications
Continue Reading... - 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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