Abstract

A new method for controlling the shape and increasing the maximum index change in the radial gradient-index profile of sol-gel bodies is demonstrated. This is accomplished by modifying the relative rates of the intricate reactions responsible for forming the gradient. In practice the changes reported here are effected solely by varying the leaching conditions. Through the proper choice of a solution to arrest the leaching action, the index change can be maximized for a given shape to double that of the previous technique. A detailed composition analysis of the data reveals that dopant diffusion and precipitation are the dominant factors influencing the observed results.

© 1992 Optical Society of America

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References

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  1. J. Crank, The Mathematics of Diffusion (Oxford U. Press, New York, 1979), p. 69.
  2. S. Konshi, K. Shingyouchi, A. Makishima, “r-Grin glass rods prepared by a sol gel method,” J. Non-Cryst. Solids 100, 511–513 (1988).
    [CrossRef]
  3. M. Yamane, J. B. Caldwell, D. T. Moore, “Preparation of gradient-index glass rods by the sol-gel process,” J. Non-Cryst. Solids 85, 244–246 (1986).
    [CrossRef]
  4. J. B. Caldwell, “Sol-gel methods for making radial gradient-index glass,” Ph.D. dissertation (University of Rochester, Rochester, N.Y., 1989).
  5. P. Schultz, “Binary titania-silica glasses containing 10 to 20 wt. % TiO2,” J. Am. Ceram. Soc. 59, 214 (1976).
    [CrossRef]

1988 (1)

S. Konshi, K. Shingyouchi, A. Makishima, “r-Grin glass rods prepared by a sol gel method,” J. Non-Cryst. Solids 100, 511–513 (1988).
[CrossRef]

1986 (1)

M. Yamane, J. B. Caldwell, D. T. Moore, “Preparation of gradient-index glass rods by the sol-gel process,” J. Non-Cryst. Solids 85, 244–246 (1986).
[CrossRef]

1976 (1)

P. Schultz, “Binary titania-silica glasses containing 10 to 20 wt. % TiO2,” J. Am. Ceram. Soc. 59, 214 (1976).
[CrossRef]

Caldwell, J. B.

M. Yamane, J. B. Caldwell, D. T. Moore, “Preparation of gradient-index glass rods by the sol-gel process,” J. Non-Cryst. Solids 85, 244–246 (1986).
[CrossRef]

J. B. Caldwell, “Sol-gel methods for making radial gradient-index glass,” Ph.D. dissertation (University of Rochester, Rochester, N.Y., 1989).

Crank, J.

J. Crank, The Mathematics of Diffusion (Oxford U. Press, New York, 1979), p. 69.

Konshi, S.

S. Konshi, K. Shingyouchi, A. Makishima, “r-Grin glass rods prepared by a sol gel method,” J. Non-Cryst. Solids 100, 511–513 (1988).
[CrossRef]

Makishima, A.

S. Konshi, K. Shingyouchi, A. Makishima, “r-Grin glass rods prepared by a sol gel method,” J. Non-Cryst. Solids 100, 511–513 (1988).
[CrossRef]

Moore, D. T.

M. Yamane, J. B. Caldwell, D. T. Moore, “Preparation of gradient-index glass rods by the sol-gel process,” J. Non-Cryst. Solids 85, 244–246 (1986).
[CrossRef]

Schultz, P.

P. Schultz, “Binary titania-silica glasses containing 10 to 20 wt. % TiO2,” J. Am. Ceram. Soc. 59, 214 (1976).
[CrossRef]

Shingyouchi, K.

S. Konshi, K. Shingyouchi, A. Makishima, “r-Grin glass rods prepared by a sol gel method,” J. Non-Cryst. Solids 100, 511–513 (1988).
[CrossRef]

Yamane, M.

M. Yamane, J. B. Caldwell, D. T. Moore, “Preparation of gradient-index glass rods by the sol-gel process,” J. Non-Cryst. Solids 85, 244–246 (1986).
[CrossRef]

J. Am. Ceram. Soc. (1)

P. Schultz, “Binary titania-silica glasses containing 10 to 20 wt. % TiO2,” J. Am. Ceram. Soc. 59, 214 (1976).
[CrossRef]

J. Non-Cryst. Solids (2)

S. Konshi, K. Shingyouchi, A. Makishima, “r-Grin glass rods prepared by a sol gel method,” J. Non-Cryst. Solids 100, 511–513 (1988).
[CrossRef]

M. Yamane, J. B. Caldwell, D. T. Moore, “Preparation of gradient-index glass rods by the sol-gel process,” J. Non-Cryst. Solids 85, 244–246 (1986).
[CrossRef]

Other (2)

J. B. Caldwell, “Sol-gel methods for making radial gradient-index glass,” Ph.D. dissertation (University of Rochester, Rochester, N.Y., 1989).

J. Crank, The Mathematics of Diffusion (Oxford U. Press, New York, 1979), p. 69.

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Figures (8)

Fig. 1
Fig. 1

Index and concentration versus radius r (millimeters), as a function of acid leaching time t.

Fig. 2
Fig. 2

n contributed by the N10 term versus acid leaching time.

Fig. 3
Fig. 3

N10 versus leaching time.

Fig. 4
Fig. 4

Δn versus leaching time.

Fig. 5
Fig. 5

n contributed by the N10 term versus methanol concentration.

Fig. 6
Fig. 6

N10 versus methanol concentration.

Fig. 7
Fig. 7

Δn versus methanol concentration.

Fig. 8
Fig. 8

Profile shape as a function of fixing bath composition for t = 16 min.

Tables (1)

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Table 1 Gel Fabrication Protocol

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