High speed ultraprecision machining of germanium

Hossein Shahinian; Jayesh Navare; Charan Bodlapati; Dmytro Zaytsev; Di Kang; Deepak Ravindra

doi:10.1117/12.2536360

15 November 2019 High speed ultraprecision machining of germanium

Hossein Shahinian, Jayesh Navare, Charan Bodlapati, Dmytro Zaytsev, Di Kang, Deepak Ravindra

Proceedings Volume 11175, Optifab 2019; 111750E (2019) https://doi.org/10.1117/12.2536360
Event: SPIE Optifab, 2019, Rochester, New York, United States

Abstract

Mass production of Ge lenses is a very common operation in the infrared (IR) optics manufacturing industry. The process of choice for production of such optics is single point diamond turning (SPDT). Ge is a very suitable material for SPDT and this gives the ability to produce complex elements with excellent surface finishes (<5 nm RMS). In this paper the application of the Micro-LAM (referred to μ-LAM hereafter) process in SPDT of single crystal Ge is reported. The main idea is to investigate the maximum in-feed rates for a spindle speed of 5000 RPM as function of the tool nose radius and rake angle. Typical industry practice is to machine Ge with a spindle speed of 5000 RPM to 12000 RPM, and finishing in-feed rates between 0.5 μm/rev and 1 μm/rev. It is shown that an increase in the tool nose radius leads to an increase in the maximum in-feed achievable without the appearance of brittle fracture zones on the surface. It is also shown that using larger negative rake angles can also enable higher tool in-feeds without trade-off’s to the surface quality.

Conference Presentation

Citation Download Citation

Hossein Shahinian, Jayesh Navare, Charan Bodlapati, Dmytro Zaytsev, Di Kang, and Deepak Ravindra "High speed ultraprecision machining of germanium", Proc. SPIE 11175, Optifab 2019, 111750E (15 November 2019); https://doi.org/10.1117/12.2536360

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