Infrared nanosecond laser-metal ablation in atmosphere: Initial plasma during laser pulse and further expansion
- State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Shaanxi 710049 (China)
We have investigated the dynamics of the nanosecond laser ablated plasma within and after the laser pulse irradiation using fast photography. A 1064 nm, 15 ns laser beam was focused onto a target made from various materials with an energy density in the order of J/mm{sup 2} in atmosphere. The plasma dynamics during the nanosecond laser pulse were observed, which could be divided into three stages: fast expansion, division into the primary plasma and the front plasma, and stagnation. After the laser terminated, a critical moment when the primary plasma expansion transited from the shock model to the drag model was resolved, and this phenomenon could be understood in terms of interactions between the primary and the front plasmas.
- OSTI ID:
- 22162864
- Journal Information:
- Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 16 Vol. 102; ISSN APPLAB; ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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