Abstract
A method for measuring depth profiles in volume phase gratings recorded in doped poly-(methyl methacrylate) (PMMA) is demonstrated. The profiles are the product of photosensitivity and light distribution. Photosensitivity is governed by the distribution of residual monomer. Insensitive PMMA samples may be sensitized by in-diffusion of monomer. The photoinitiator bis(cyclopentadienyl)-titanium-dichloride (Cp2TiCl2) is found to be moisture sensitive.
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