SHared Aperture Diffractive Optical Elements

All prototypes that can be delivered have been delivered and the quality of the 5 plex copies is good in spot aberration and size, in Bragg angle and in crosstalk but lacks required efficiency because of excessive scatter recorded in the master. The final 4 months of this contract were performed when conditions in the lab were too harsh to complete the extremely long exposures required while maintaining sufficient thermal stability. An improved master HOE will be shot and delivered when the weather is better. It will be a post contract activity at no extra charge to NASA made necessary by bad weather.