摘要：

A method for producing a plastic optical device having refractive index profile, which comprises filling the hollow of a hollow plastic structure with at least one non-polymerizable compound having a refractive index higher by at least 0.001 than that of the plastic structure, and diffusing the non-polymerizable compound into the plastic structure. The method gives a plastic optical device having refractive index profile free from a problem of loss increase owing to thermal deterioration or depolymerization.

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