Codeposition of continuous composition rugate filters.
Rugate filters are optical thin film interference structures with sinusoidal refractive index profiles. Two-wavelength reflection filters have been fabricated by codeposition of SiO(2) and TiO(2). Composition modulation was monitored and controlled using quartz crystal rate controllers. The resulting filters exhibited two well-defined stopbands. Microscopic examination revealed that the structure is glasslike without pronounced thin film microstructure.
Gunning
W J
WJ
Hall
R L
RL
Woodberry
F J
FJ
Southwell
W H
WH
Gluck
N S
NS