| 摘要 |
<p>[Object] In the manufacture of a GRIN lens using a sol-gel process, breaking and phase separation of a preform are prevented and the viscosity during wire-drawing is increased so that the yield is improved, and also production of a GRIN lens with a high numerical aperture is enabled. [Solving Means] In the manufacture of a GRIN lens using a sol-gel process, in the process of forming a wet gel from an alcohol solution containing, as main components, a silicon alkoxide, a dopant alkoxide, and an aluminum alkoxide, first, an alcohol solution containing the silicon alkoxide and the aluminum alkoxide as main components is prepared, and then the dopant alkoxide is mixed thereto.</p> |
