Control of surface ablation on fused silica with ultrafast laser double-pulse based on seed electrons dynamics control

K. H. Zhang; X. Li; W. L. Rong; P. Ran; B. Li; P. Feng; Q. Q. Yang

doi:10.1117/12.2202346

15 October 2015 Control of surface ablation on fused silica with ultrafast laser double-pulse based on seed electrons dynamics control

K. H. Zhang, X. Li, W. L. Rong, P. Ran, B. Li, P. Feng, Q. Q. Yang

Author Affiliations +

Proceedings Volume 9673, AOPC 2015: Micro/Nano Optical Manufacturing Technologies; and Laser Processing and Rapid Prototyping Techniques; 96730Z (2015) https://doi.org/10.1117/12.2202346
Event: Applied Optics and Photonics China (AOPC2015), 2015, Beijing, China

Abstract

The influence of pulse-separation (τ_s) between a pair of temporally separated femtosecond laser pulses (with near ablation-threshold energy) on surface ablation of SiO₂ were experimentally studied. A τ_s range of τ_s≤20 ps was considered. It was shown that a τ_s-independent/-dependent crater ablation area can be flexibly controlled. Once the pulse energy of the pulse pair exceeds a threshold value, crater ablation area become quasi-τ_s-independent at τ_s> ~1 ps. This τ_s-independent phenomenon can even be observed when each pulse within the double-pulse pair has a sub-threshold energy, which leads to a further reduction in ablation size. The experimental findings have not only confirmed our previous calculation based on a modified model, but also greatly extended the results both quantitatively and qualitatively. A dominant amount of seed electron from photoionization of self-trapped excitons (STEs) is responsible for the appearance of τ_s-independent phenomena. For physical interest, it is inferred that destruction of STEs will tend to break the τ_s-independent ablation phenomena. Experiments performed on CdWO₄, a material exhibiting similar electron dynamics to that in SiO₂ but a faster decay in STE population, support this conjecture. A possible improvement for the relevant theoretical modeling is also suggested based on the experimental findings.

Citation Download Citation

K. H. Zhang, X. Li, W. L. Rong, P. Ran, B. Li, P. Feng, and Q. Q. Yang "Control of surface ablation on fused silica with ultrafast laser double-pulse based on seed electrons dynamics control", Proc. SPIE 9673, AOPC 2015: Micro/Nano Optical Manufacturing Technologies; and Laser Processing and Rapid Prototyping Techniques, 96730Z (15 October 2015); https://doi.org/10.1117/12.2202346

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KEYWORDS

Laser ablation

Electrons

Picosecond phenomena

Solar thermal energy

Silica

Femtosecond phenomena

Chemical species

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