| 摘要 |
<p>PCT No. PCT/CH85/00038 Sec. 371 Date Nov. 7, 1985 Sec. 102(e) Date Nov. 7, 1985 PCT Filed Mar. 4, 1985 PCT Pub. No. WO85/03928 PCT Pub. Date Sep. 12, 1985.Optical glasses based on silica and alumina, rich in modifying metals such as silver, thallium and cesium. The exchange by cathodic migration in a melted salt bath of said modifying metals by metals such as K, Na and Li, exchange which leads to a corresponding variation of the refraction index of the glass according to a certain predetermined profile, is performed very efficiently and rapidly. Such an exchange is performed either on the finished glass or on a microporous form thereof.</p> |
