Several test runs were necessary to ensure that the ratio between the witness samples and the fiber optics were targeted correctly for this tight tolerance.
Blue Ridge Optics used a thin layer of high index deposition material and a thick layer low index deposition material for lower loss and increased durability on the fiber optics.
Special ion preclean and ion assisted deposition (IAD) parameters were developed with optimal blends of argon and oxygen to ensure adhesion and low loss.
Chamber software with real-time optical monitoring along with secondary crystal monitoring were used throughout the deposition process. The optical monitoring system measures transmission across the specified wavelength once per planetary revolution while the parts are in chamber vacuum.
Specifications were met as Blue Ridge Optics utilized IAD and real-time optical monitoring to control wavelength targeting shifts from vacuum to atmosphere on the fiber optics.