Gradient-index-type optical device

Details Gradient-index-type optical device Gradient-index-type optical device

1988-06-01

1990-11-20

Gonzalez, Frank

350413, G02B 618

Patent

active

049714236

ABSTRACT:
A gradient index-type optical device is produced by the ion exchange process. First, a transparent dielectric body contacting an ion to be exchanged is provided with a light-absorbing portion containing also an ion to be exchanged and a coloring component at at least a part of the surface thereof. The transparent dielectric is soaked in or caused to contact a molten salt containing an ion providing a refracted index distribution for ion exchange. In the gradient index-transparent dielectric thus produced, the light-absorbing portion can have a refractive index continuous with that of the transparent dielectric body and a thermal expansion coefficient equal to or smaller than that of the transparent dielectric body, so that flare at the boundary and the stress fragility are alleviated. The optical device can also have a good size accuracy.

REFERENCES:
patent: 3941474 (1976-03-01), Kitano et al.
patent: 4799761 (1989-01-01), Yamamoto et al.

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