Compositions: ceramic – Ceramic compositions – Glass compositions – compositions containing glass other than...
Reexamination Certificate
2000-04-07
2002-08-20
Group, Karl (Department: 1755)
Compositions: ceramic
Ceramic compositions
Glass compositions, compositions containing glass other than...
C501S060000, C501S074000, C385S037000, C385S124000
Reexamination Certificate
active
06436857
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to lead silicate glasses.
2. Description of the Prior Art
Photosensitivity, the long-term change of glass refractive index following optical irradiation, has found application in telecommunications see A. Othonos,
Rev. Sci. Instrum
. 68, 4309 (1997), and data storage, see A. Partovi, T. Erdogan, V. Mizrahi, P. J. Lemaire, A. M. Glass and J. W. Fleming,
Appl Phys. Lett
. 64, 821 (1994). The preponderance of the investigations in optical fiber have been devoted to germanosilicate glasses with An, the index difference between irradiated and non-irradiated material, saturating at about 0.01 for hydrogen loaded fibers with limited stability at elevated temperatures, see A. Othonos,
Rev. Sci. Instrum
. 68, 4309 (1997). For data storage, crystalline phase change materials have been explored because of the large index changes available. However, these materials are not useful for fiber applications. Therefore, there exists a need for glasses with higher photosensitivity for improved performance in both fiber and volume storage applications.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a method for forming lead silicate glass materials having large, thermally stable photosensitivities.
It is another object of the present invention to provide a method for forming lead silicate glass materials that may be for used in telecommunications, integrated optics and data storage technologies.
It is yet another object of the present invention to provide a method for forming glasses with higher photosensitivity for improved performance in both fiber and volume storage applications.
According to a first broad aspect of the present invention, there is provided a method for inducing a refractive index change in a lead silicate glass material comprising: providing a lead silicate glass material; and irradiating the lead silicate glass material to increase the index of refraction of said lead silicate glass material.
According to a second broad aspect of the present invention, there is provided a photo-induced lead silicate glass grating.
Other objects and features of the present invention will be apparent from the following detailed description of the preferred embodiment.
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Long et al., “Large photosensitity in lead-silicate glasses,” Applied Physics Letters, vol. 74, No. 15, Apr. 12, 1999.
Long et al., “Composition dependence of the photoinduced refractive-index change in lead silicate glasses,” Optics Letters, vol. 24, No. 16, Aug. 15, 1999.
Brueck Steven R. J.
Long Xiangcun
Group Karl
Jagtiani & Guttag
University of New Mexico
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