Interference filters can absorb visible-NIR
Interference filters are widely used in a transmissive configuration, whereby light passes through the filter to cause some effect, be that band-pass, short-pass or long-pass etc. By nature, interference filters do not generally absorb in the visible-NIR, but instead light is either transmitted or reflected. That makes transmissive interference filters suitable for applications within this spectral range.
Things become more difficult however when high transmission is required in either the UV or IR, where the intrinsic properties of materials cause them to absorb certain wavelengths.
For such situations it is possible to use a number of interference filters in reflection to isolate the desired wavelengths by taking advantage of high reflectivity without the absorption associated with transmissive filters. A variety of configurations are available which can either maintain the optical axis or steer the beam in a chosen direction.
Another area in which this method excels is creating narrow notch rejection filters. A narrow notch filter in transmission is notoriously difficult to produce, particularly when a high OD is required in the rejection band.
LASER COMPONENTS‘ partners Omega Optical can now use their industry leading high transmission narrow bandpass fi lters in reflection to create very narrow notches.
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