A hybrid fabrication approach and profile error compensation for silicon aspheric optics

Sharma, Rohit and Mishra, Vinod and Khatri, Neha and Garg, Harry and Karar, Vinod (2017) A hybrid fabrication approach and profile error compensation for silicon aspheric optics. Journal of Engineering Manufacture. ISSN 0954-4054

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Official URL: http://journals.sagepub.com/doi/abs/10.1177/095440...

Abstract

Aspheric optics is widely used for many optical applications due to their advantages, that is, light weight, cost-effectiveness and efficiency. There are many fabrication challenges which affect the quality of aspheric optics used for infrared-based applications. Diamond turning is one of the most suitable techniques for fabrication of infrared aspheric lens with high profile accuracies, due to its deterministic approach. However, for optics with large sag value, multiple machining cycles are required to make the best fit surface. Repeated machining cycles result in generation of inherent stresses leading to subsurface deformation and poor quality. In this study, hybrid approach of grinding and machining is proposed for fabrication of silicon infrared optics in large volume. The proposed approach results in reduced fabrication time and subsurface deformation with improved surface quality and tool life. The profile accuracy after compensation of profile error (Pt) is 0.21 µm and surface roughness (Ra) 10.5 nm is achieved.

Item Type: Article
Uncontrolled Keywords: Profile error, compensation, silicon, brittle machining, aspheric, ultra-precision machining
Subjects: CSIO > Optics
Depositing User: Ms. Jyotsana
Date Deposited: 06 Aug 2018 17:23
Last Modified: 06 Aug 2018 17:23
URI: http://csioir.csio.res.in/id/eprint/722

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