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Proceedings Paper

Aspheric optics fabrication by single point diamond turning: some issues
Author(s): RamaGopal V. Sarepaka; Siva Sakthibalan; Somaiah Doodala; Rakesh S. Panwar; Rajendra Kotaria
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Paper Abstract

The demands on advanced instrumentation have propelled precision optical system developers to aim at achieving near theoretical performance (in terms of resolution, photonic intensity on image plane etc), under system budgets of weight, volume and foot-print. These requirements can only be met by deploying innovative optical surfaces (aspheric, torics, freeforms etc.) with holistic advancements in optical design, fabrication, assembly and testing. While these novel surfaces offer design and performance advantages, their fabrication (mostly by SPDT) and characterization present unique challenges in system development and resource optimization. This calls for a deep insight of all involved issues of precision optical system development. This presentation deliberates on some major issues involved in Single Point Diamond Turning (SPDT) for optical material processing for the desired optical surface quality, viz: diamond tool selection and geometries, tool positional logistics, design and dynamics of fixtures deployed, machining parametric optimization, optimal machining conditions, work-piece handling (pre-during-post SPDT), material characteristics, tool wear and its effect on surface quality, machining protocols, error correction techniques deployed, profile errors due to thermal energy generated during precision machining, and corresponding profile compensation correction. SPDT being a multi-variate process, its outcome in terms of the surface quality (Form, Figure and Finish) will be severely affected (individually and collectively) by all process parameters. The objective of this study is to adopt a deterministic approach of precision surface generation of desired optical quality. Hence, this discussion provides a better starting point for the practioners of ultra-precision machining for the development of novel precision optical surfaces.

Paper Details

Date Published:
Proc. SPIE 10448, Optifab 2017, ; doi: 10.1117/12.2279787
Show Author Affiliations
RamaGopal V. Sarepaka, Optics & Allied Engineering Pvt. Ltd. (India)
Siva Sakthibalan, Optics & Allied Engineering Pvt. Ltd. (India)
Somaiah Doodala, Optics & Allied Engineering Pvt. Ltd. (India)
Rakesh S. Panwar, Optics & Allied Engineering Pvt. Ltd. (India)
Rajendra Kotaria, Optics & Allied Engineering Pvt. Ltd. (India)

Published in SPIE Proceedings Vol. 10448:
Optifab 2017
Julie L. Bentley; Sebastian Stoebenau, Editor(s)

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