LASER PROCESSING OF CHEMICALLY DERIVED DICHROIC FILTERS

Optical interference filters were fabricated using multilayer stacks d erived from sol-gel SiO2 and SiO2-TiO2 coatings. Laser processing was then used to modify the spectral properties (color) of local regions o f these stacks. Changes in color were analyzed with respect to changes in the individual film thicknesses and refractive indices. Design con siderations and some basic limitations of laser firing for tuning inte rference filter colors are also discussed.