Process for making gradient index optical elements

Details Process for making gradient index optical elements Process for making gradient index optical elements

1997-04-02

1998-11-17

Chin, Peter

Glass manufacturing

Processes

Sol-gel or liquid phase route utilized

65 301, 65 3013, 65 31, 65399, 65440, C03B 800, C03C 1500, C03C 1700, C03C 2100

Patent

active

058370234

ABSTRACT:
The invention provides a process for making a gradient index optical element having a precisely parabolic configuration of refractive index profile. After a concentration profile is imparted across a gel prepared by a sol-gel technique, the concentration profile is fixed. In this case, the treatment with a concentration profile-fixing solution is carried out at a temperature higher than that at which the treatment with a concentration profile-imparting solution is carried out, whereby the rate of fixing the concentration profile is so higher than that of imparting the concentration profile, so that any possible deformation of the concentration profile formed at the concentration profile-imparting step is reduced or inhibited.

REFERENCES:
patent: 5069700 (1991-12-01), Yamane et al.
patent: 5171344 (1992-12-01), Noda
patent: 5439495 (1995-08-01), Koike et al.
Principle and Application on Gradient Index Optical Imaging, K.Nishizawa, pp. 748-758, from the Review of Loser Engineering 8 (5) 1980, See Appln. p. 4.
Communication of the American Ceramic Society Determination of Diffusion Coefficients of Dopants In Wet Gels During Leaching,K.Shingyouchi et al Feb. 1988 pp. C-82 --C-84 Also see Appln. p. 7.
Journal of non-crystalline solids 169 (1994) pp. 160 -168 Leaching Silicon-Based Wet Gels To Approach Grin, Dah-Shyang Tsai et al, Also see Appln. p. 8.

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