Gradient Index Lenses from Sol-Gel Layering
Annual rept. 1 Jul 1993-30 Jun 1994
CALIFORNIA UNIV LOS ANGELES DEPT OF MATERIALS SCIENCE AND ENGINEERING
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The research proposed here is based on the principle of the density gradient column. A liquid A of low density is continuously mixed into a liquid B of higher density while B is allowed to flow slowly down the wall of a glass cylinder. The feed rate of A is equal to the flow rate of mixture. Thus, a gradient density column is formed. Such columns have been used to measure the density of semiconductors to five 5 significant figures. The gradient is stable for many months at room temperature. We proposed to use this method to prepare gradient index GRIN lenses from gels with large axial gradients. The chemical compositions of two sols are selected based on considerations of solubility between the sols differences in refractive index, density, expansion coefficient and densification temperatures between resulting oxides.
- Inorganic Chemistry
- Physical Chemistry