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OptiLayer:  Your Partner in Design and Post-Production Characterization of Optical Coatings

 

Edge Filters

Edge Filters split incident light into two parts according to wavelength: one part contains the light with all the longer wavelengths and the other part the light with all the shorter wavelengths. One part of the incident light is transmitted and the other one is reflected and/or absorbed. Depending on whether the transmitted part contains the longer or shorter wavelengths, edge filter is called a long wave pass (LWP) or a short wave pass (SWP), respectively.

Advanced edge filters may contain a series of passbands and stopbands.

The target of the long wave pass Edge Filters is to minimize transmittance below a specified a cut-on wavelength and maximize transmittance above it. Short wave pass filters are designed to reflect shorter wavelengths and transmit longer wavelengths. Longpass Edge Filters are used to isolate portions of the spectrum in a variety of industrial or life sciences optical devices.

Example: Short wave pass filters designed by OptiLayer using two different optimization methods: DLS (left panel) and Newton method (right panel). In both cases the same starting design (21-layer quarter wave  with the central wavelength of 620 nm) was used. 
short wave pass filter edge filter
Example: Long wave pass filters designed by OptiLayer using two different optimization methods: DLS (left panel) and Newton method (right panel) in combination with the gradual evolution technique. In both cases the same starting design (21-layer quarter wave  with the central wavelength of 620 nm) was used. 
 long wave pass filter  edge filter
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