In many optical systems splitting of certain parts of the spectrum may be required to guide radiation into certain paths . This is often done by a filter working at a 45 degree angle, 1 part of the spectrum being reflection off the front face the other face being transmitted, see the diagram below:
This is the most common type of dichroic filter. They can be used for the following examples, splitting visible and IR radiation, sub dividing parts of visible and IR radiation. Polarisation effects can be substantial when designing dichroics and it is always worth asking your filter manufacturer for additional information on this particularly when splitting 2 close bands of radiation. Vortex manufacture a wide range of custom dichroic filters, come and discuss your needs with us today. Enquiries@vortexoc.com