CaF2 Lens machining optimization by using the laser assisted DTM

Dong Hwan Kim; Hwan-ho Maeng; Hyoung-uk Jang; Jinseong Jeong; Seung-Hyun Kim; Tae-sik Myung

doi:10.1117/12.2568389

20 August 2020 CaF2 Lens machining optimization by using the laser assisted DTM

Dong Hwan Kim, Hwan-ho Maeng, Hyoung-uk Jang, Jinseong Jeong, Seung-Hyun Kim, Tae-sik Myung

Proceedings Volume 11487, Optical Manufacturing and Testing XIII; 114871J (2020) https://doi.org/10.1117/12.2568389
Event: SPIE Optical Engineering + Applications, 2020, Online Only

Conference Poster

Abstract

The CaF2 optical lens was widely used from ultraviolet- to infrared- wavelength range. The CaF2 has optical properties with high transmittance and low reflectance. Usually, it used for laser optics, excimer laser, CaF2 Lens, ultraviolet to infrared lens and cryogenic cooling thermal imaging systems. It is usually difficult to machining using natural diamond tools, because CaF2 is a brittle material. In theoretical calculations and experimental verification, we executed the ultra-precision machining of CaF2 lens by using the Single-point diamond turning machine(DTM) with laser-assisted modules. The machining of CaF2 materials is affect the negative angle of a diamond tool and laser power, etc. Repeated experiments show that surface of the CaF2 lens more than 150% better by using laser-assisted modules and negative angle tools than conventional DTM machining.

Citation Download Citation

Dong Hwan Kim, Hwan-ho Maeng, Hyoung-uk Jang, Jinseong Jeong, Seung-Hyun Kim, and Tae-sik Myung "CaF2 Lens machining optimization by using the laser assisted DTM", Proc. SPIE 11487, Optical Manufacturing and Testing XIII, 114871J (20 August 2020); https://doi.org/10.1117/12.2568389

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