Shortpass
Technical and application notes
To understand blocking, one has to understand the concept of optical density (OD). In an interference filter, OD is generated by reflecting unwanted light back instead of letting it go through the filter.
Filter Design
—New!
Articles
Robert L. Johnson and Sarah Locknar; reprinted from the 2019 issue of Photonics Handbook, Laurin Publishing
Filter Design
Technical and application notes

We design and produce filters for many different applications. Each application has specific, often complex and demanding requirements. The level of performance attained in an optical system depends upon the integration of the filter design with the performance of other system components. 

Filter Design