Optical filters for forming enhanced images
US Patent # 5,646,781 Granted July 8, 1997 Inventor: Robert L. Johnson, Jr.
Protective optical filter assembly
US Patent # 6,918,673 Granted July 19, 2005 Inventors: Robert L. Johnson, Natalia Gorawski, Barry O'Dwyer
System for multispectral imaging of fluorescence
US Patent # 9,155,474 Inventors: Gary E. Carver, Sheetal K. Chanda, William A. Morrison, Sarah A. Locknar, Robert L. Johnson, Jr.
Blocking in an Optical Filter
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 Cleaning Tech Note
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.
Ultra-narrow bandpass optical interference filters for deep space optical communication
Proc. SPIE 10524, Free-Space Laser Communication and Atmospheric Propagation XXX, 1052416 (2018) doi:10.1117/12.2290753
How much OD do you actually need for Flow Cytometry?
In this technical note, we will go through an example of how to determine the blocking level needed in a typical flow-cytometer system.
Ultraviolet Filters- Past and Present
Robert L. Johnson and Sarah Locknar; reprinted from the 2019 issue of Photonics Handbook, Laurin Publishing
Omega Optical Celebrates its 50th Anniversary!
Robert Johnson founded Omega Optical on January 1, 1969 after working for a short time With Edgar Barr and the original Thin Film Products group. He put together a lab in a small barn in West Brattleboro, Vermont, with an
Ion-assisted deposition of moisture-stable Hafnium Oxide films for ultraviolet applications
Applied Optics, 41 (16): 3205-3210 (2002) doi 10.1364/AO.41.003205
Ion-assisted deposition of moisture stable Hafnium Oxide thin-films
Dale Morton and Traci R. Jensen Optical Interference Coatings, OSA Technical Digest Series (Optical Society of America, 2001), paper MB6 doi 10.1364/OIC.2001.mb6