Laser-Assisted Diamond Turning for Anisotropy Suppression in Calcium Fluoride

Xing, Enbo; Xue, Jinsong; Yang, Rongbiao; Wang, Mingyue; Zhou, Huimin; Xing, Guohui; Li, Jianglong; Rong, Jiamin; Wen, Huanfei; Tang, Jun; Liu, Jun

doi:10.3390/mi17040425

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Open AccessArticle

Laser-Assisted Diamond Turning for Anisotropy Suppression in Calcium Fluoride

by

Enbo Xing

¹,

Jinsong Xue

¹,

Rongbiao Yang

¹,

Mingyue Wang

¹,

Huimin Zhou

¹,

Guohui Xing

²,

Jianglong Li

²,

Jiamin Rong

^2,*,

Huanfei Wen

¹

,

Jun Tang

² and

Jun Liu

^1,*

¹

State Key Laboratory of Extreme Environment Optoelectronic Dynamic Measurement Technology and Instrument, North University of China, Taiyuan 030051, China

²

School of Semiconductors and Physics, North University of China, Taiyuan 030051, China

^*

Authors to whom correspondence should be addressed.

Micromachines 2026, 17(4), 425; https://doi.org/10.3390/mi17040425

Submission received: 16 March 2026 / Revised: 27 March 2026 / Accepted: 29 March 2026 / Published: 30 March 2026

(This article belongs to the Special Issue Laser Micro/Nano Fabrication and Surface Modification Technology)

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Abstract

This paper proposes the use of laser-assisted cutting technology to control the brittle–plastic transition of single-crystal CaF₂ through local thermal softening, thereby suppressing its processing anisotropy. Nano-scratch experiments show that heating significantly increases the critical plastic cutting depth of each crystal plane and reduces the inter-plane differences. Based on this, laser-assisted ultra-precision turning was used to fabricate CaF₂ optical microcavities with a surface roughness below 10 nm, achieving a maximum quality factor of ~7.79 × 10⁷, and significantly reducing the performance differences among different crystal orientations. The research indicates that this method can effectively promote uniform plastic flow on each crystal plane, providing an effective approach for the high-performance and consistent fabrication of anisotropic brittle optical components.

Keywords: laser-assisted cutting; calcium fluoride (CaF₂); anisotropy suppression; optical microcavities; brittle-ductile transition

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MDPI and ACS Style

Xing, E.; Xue, J.; Yang, R.; Wang, M.; Zhou, H.; Xing, G.; Li, J.; Rong, J.; Wen, H.; Tang, J.; et al. Laser-Assisted Diamond Turning for Anisotropy Suppression in Calcium Fluoride. Micromachines 2026, 17, 425. https://doi.org/10.3390/mi17040425

AMA Style

Xing E, Xue J, Yang R, Wang M, Zhou H, Xing G, Li J, Rong J, Wen H, Tang J, et al. Laser-Assisted Diamond Turning for Anisotropy Suppression in Calcium Fluoride. Micromachines. 2026; 17(4):425. https://doi.org/10.3390/mi17040425

Chicago/Turabian Style

Xing, Enbo, Jinsong Xue, Rongbiao Yang, Mingyue Wang, Huimin Zhou, Guohui Xing, Jianglong Li, Jiamin Rong, Huanfei Wen, Jun Tang, and et al. 2026. "Laser-Assisted Diamond Turning for Anisotropy Suppression in Calcium Fluoride" Micromachines 17, no. 4: 425. https://doi.org/10.3390/mi17040425

APA Style

Xing, E., Xue, J., Yang, R., Wang, M., Zhou, H., Xing, G., Li, J., Rong, J., Wen, H., Tang, J., & Liu, J. (2026). Laser-Assisted Diamond Turning for Anisotropy Suppression in Calcium Fluoride. Micromachines, 17(4), 425. https://doi.org/10.3390/mi17040425

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Laser-Assisted Diamond Turning for Anisotropy Suppression in Calcium Fluoride

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