1989 Fiscal Year Final Research Report Summary
Preparation of GRIN Glass Rods of Large Diameter
| Project/Area Number |
63850014
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| Research Category |
Grant-in-Aid for Developmental Scientific Research
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| Allocation Type | Single-year Grants |
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| Research Field |
物理計測・光学
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| Research Institution | TOKYO INSTITUTE OF TECHNOLOGY |
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Principal Investigator |
YAMANE Masayuki Tokyo Institute of Technology, Faculty of Engineering, Prof., 工学部, 教授 (40016382)
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| Co-Investigator(Kenkyū-buntansha) |
YASUMORI Atsuo Tokyo Institute of Technology, Faculty of Engineering, Res.Associate, 工学部, 助手 (40182349)
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| Project Period (FY) |
1988 – 1989
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| Keywords | Gradient-Index Lens / Sol-Gel Process / Pb-Containing Glass |
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| Research Abstract |
On the purpose of preparing r-GRIN glass rods having a diameter larger than 10mm, the conditions on the various treatments for the preparation of the rods of PbO-K2O-B203-SiO2 system by sol-gel process have been studied.
The results obtained were summarized as follows; (1) A bubble free gel of large size can be prepared by adding the mixture of acetic acid and aqueous lead acetate solution to a sol obtained by hydrolyzing a precursor solution consisted of tetraethoxysilane, tetramethoxysilane, and boronethoxide with aqubous hydrochloric acid of pH=2. (2) The pretreatment of the gel prior to the formation of concentrational gradient of lead should be made by aging the gel at 60 C in the mold, soaking in a solution of water-isopropanol system, and subsequent successive soaking in the solutions of isopropanol-acetonsystem (isopropanol/aceton=8/2, 5/5,0/10), in order to remove unnecessary water and acetic acid and to precipitate fine lead crystals on the micropore walls of the gel. (3) Formation of concentrational difference of lead in 4% between center and perimeter can be made by soaking the pretreated gel of about 35mm in diameter and 50mm in length in an ethanolic solution of potassium acetate for 4h. (4) A transparent bubble free GRIN glass rod of about 13mm in diameter and 20mm in length having a refractive index difference of about 0.05 between center and perimeter can be obtained by drying the gel in an atmosphere saturated with aceton, followed by sintering at 580 C.
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