Control of ablation anisotropy in fluoride crystal by a linearly polarized femtosecond laser

Kaihu Zhang; Mingyu Lu; Yuliang Zhang; Zhigang Cui; Yue Zhao; Yongliang Gao; Gaoshi Su; Guoyan Wang; Xu Zhou; Xu Chen

doi:10.1117/12.2667800

21 March 2023 Control of ablation anisotropy in fluoride crystal by a linearly polarized femtosecond laser

Kaihu Zhang, Mingyu Lu, Yuliang Zhang, Zhigang Cui, Yue Zhao, Yongliang Gao, Gaoshi Su, Guoyan Wang, Xu Zhou, Xu Chen

Proceedings Volume 12595, Advanced Fiber Laser Conference (AFL2022); 1259511 (2023) https://doi.org/10.1117/12.2667800
Event: Advanced Fiber Laser Conference (AFL2022), 2022, Changsha, China

Abstract

We experimentally showed that the π/2-period oscillation of femtosecond laser ablation threshold with laser polarization orientation can be observed in calcium fluoride (CaF₂). While the lowest single pulse ablation threshold, 5.3 J/cm², was observed when laser polarization is along the 010-crystal axis, the highest one, 5.8±0.1 J/cm², was found when angle between polarization and the 010-crystal axis were π/4 or 3π/4. The π/2-period oscillation of ablation threshold tends to be eliminated (yet still detectable) at high pulse fluence. The anisotropic ablation is possibly resulted from the different rate of avalanche ionization in different crystal axes.

Citation Download Citation

Kaihu Zhang, Mingyu Lu, Yuliang Zhang, Zhigang Cui, Yue Zhao, Yongliang Gao, Gaoshi Su, Guoyan Wang, Xu Zhou, and Xu Chen "Control of ablation anisotropy in fluoride crystal by a linearly polarized femtosecond laser", Proc. SPIE 12595, Advanced Fiber Laser Conference (AFL2022), 1259511 (21 March 2023); https://doi.org/10.1117/12.2667800

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