| 摘要 |
<p>[PROBLEMS] To provide a method for manufacturing a GRIN lens by a sol-gel process, which can prevent foaming in wire drawing and further facilitate wire drawing operation to improve the yield. [MEANS FOR SOLVING PROBLEMS] A method for manufacturing a GRIN lens, comprising the steps of preparing a wet gel from an alcohol solution composed mainly of a silicon alkoxide, an alkoxide of a dopant, and an aluminum alkoxide, eluting a dopant and aluminum from the outer peripheral face of the wet gel by leaching to provide a refractive index distribution, drying the wet gel to prepare a dry gel, firing the dry gel to form a base material, and subjecting the base material to wire drawing. In the step of leaching, most of aluminum is eluted from the wet gel to increase the porosity of the dry gel, and, thus, cracking upon sintering and foaming upon wire drawing can be prevented.</p> |
