Taiyong Guo, Limu Zhang, Yingying Ren, Yangjian Cai, Romero Carolina, R. Vazquez de Aldana Javier. Surface Characteristics of CaF2 Crystal Ablated by Femtosecond Laser[J]. Acta Optica Sinica, 2019, 39(1): 0126019
- Acta Optica Sinica
- Vol. 39, Issue 1, 0126019 (2019)
Fig. 1. (a) Optical microscope schematic of the ablation areas on Nd∶CaF2 surface; (b) a set of ablation holes and ablation lines at energy of 2.4 μJ
Fig. 2. SEM images of ablation holes on CaF2 crystal surface with different parameters. (a) A=0.4 μJ, N=10; (b) A=0.6 μJ, N=20; (c) A=4 μJ, N=100; (d) A=4 μJ, N=1000
Fig. 3. Parameters of CaF2 crystal in stationary focusing case. (a) Squared diameter D2 of the ablation holes versus the pulse energy Ep; (b) energy flux density threshold versus laser pulse number; (c) energy flux density versus the diameters of ablation holes
Fig. 4. SEM images of ablation lines on CaF2 crystal surface with different parameters. (a)(d) A=0.8 μJ, v=60 μm/s; (b)(e) A=1.6 μJ, v=5 μm/s; (c)(f) A=2.4 μJ, v=5 μm/s
Fig. 5. Widths of ablation lines as a function of scanning speed. (a) E⊥S; (b) E//S
Fig. 6. Parameters of CaF2 crystal in dynamic scanning case.(a)(b) Energy flux density threshold versus effective laser pulse number; (c)(d) widths of the ablation lines versus energy flux density
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Table 1. Processing parameters for stationary focusing case and dynamic scanning case
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Table 2. Calculated results of effective radius, threshold of energy and energy flux density of ablation holes on the crystal surface obtained under different pulse numbers
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