Refractive Index Gradient (GRIN) Lens via the Sol-Gel Process.
Final rept. 27 Apr-26 Oct 95,
CHEMAT TECHNOLOGY INC NORTHRIDGE CA
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Optical materials which contain a distributed refractive index and are used in lens design are called gradient-index GRIN materials which have wide applications in optical systems. The feasibility of applying the sol-gel process in the fabrication of axial GRIN lens has been demonstrated in this Phase I study. Various TiO2-SiO2 sol-gel solutions have been prepared for evaluation of their applicability in the layering process. Two types of the TiO2-SiO2 sol-gel solutions have been identified to be the proper solutions for sol-gel layering. The two layering techniques proposed have been evaluated in this research and the experimental results indicate that the continuous layering technique is favored due to its ease of formation of gradient solutions. Hundreds of the gradient solutions have been fabricated using these layering technique and the experimental measurement proved the formation of the gradient. The gradient is retained during the gelation, drying and sintering. The refractive index increases along the process from 0.01 to 0. 1. The refraction index distribution of the prepared samples was measured as linear The maximum refractive index change is about 0.1 in the sintered glasses.