Filter Design
Protective optical filter assembly
Patents
US Patent # 6,918,673
Granted July 19, 2005
Inventors: Robert L. Johnson, Natalia Gorawski, Barry O'Dwyer

A hermetic filter assembly which improves filter life and environmental stability. The elimination of optical epoxies in this air-spaced filter results in reduced auto-fluorescence, improved parallelism and flatness, and improved heat tolerance. 3rd Millennium filters were originally based on this technology- currently RapidBand filters are made with a similar technique. 

Bandpass
Fluorescence Imaging
Defense
LIDAR and Optical Communications
Gas Sensing
Filter Design
Blocking in an Optical Filter
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.
Bandpass
UV Filters
Longpass
Shortpass
Flow Cytometry
LIDAR and Optical Communications
Fluorescence Imaging
Defense
Filter Design
Filter Cleaning Tech Note
Technical and application notes
Learn best practices for cleaning your Omega Optical filters. The vast majority of Omega Optical’s interference filters are either sputtered oxide or coatings protected with coverslips.
Filter Design
Ultraviolet Filters- Past and Present
—New!
Articles
Robert L. Johnson and Sarah Locknar; reprinted from the 2019 issue of Photonics Handbook, Laurin Publishing
UV Filters
Bandpass
Shortpass
Filter Design
Graded Period Rugates
Conference proceedings
Proc. SPIE 2046, Inhomogeneous and Quasi-Inhomogeneous Optical Coatings, 147 (November 2, 1993); http://dx.doi.org/10.1117/12.163552
Capabilities
Filter Design
Dual Band Antireflection Coatings for the Infrared
Conference proceedings
Proc. SPIE 6940, Infrared Technology and Applications XXXIV, 69400T (April 15, 2008); http://dx.doi.org/10.1117/12.780288
IR Filters
Anti-reflection
Capabilities
Filter Design
Thin-film Materials
Specialty Coating