Optical EngineeringFabrication of multilevel structures in self-development photosensitive hybrid sol-gel glass by a gray scale mask
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To extend the application of self-development sol-gel glass, we report a simple method to fabricate arbitrary multilevel structures in self-development photosensitive hybrid sol-gel glass by using a high-energy beam-sensitive gray scale mask under UV radiation. Characterization results showed that the maximum depth of deformation induced by the UV light can be more than 1.3 μm, which makes it possible to fabricate diffractive optical elements with a 2π phase delay for visible light. As an example, the self-development sol-gel glass was used for fabrication of blazed gratings with excellent surface smoothness.