Double-pulse technique for short pulse laser drilling
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1.
Wuhan National Laboratory for Optoelectronics, School of Optoelectronic Science and Engineering, Huazhong University ofScience and Technology, Wuhan 430074, China;;
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2.
Institut fur Strahlwerkzeuge, Universitat Stuttgart, Stuttgart 70569, Germany
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Corresponding author:
LIU Jin-song, jsliu4508@vip.sina.com
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Received Date:
2008-03-27
Accepted Date:
2008-05-05
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Abstract
In order to improve the efficiency of short pulse laser drilling,a double-pulse technique is put forward.The double-pulse herein represents two neighboring nanosecond pulses with several tens of nanoseconds interpulse separation,acquired by temporal pulse shaping.In the experiments,laser beams from a Q-switched Nd: YLF laser was focused on steel workpieces 0.4mm~1.0mm thick.The influence of energy density,repetition rate and the ambient gas pressure on ablation rate was studied. Che experimental results show a significant enhancement of ablation rates using double-pulse instead of conventional single-pulse under the same condition of energy density and pulse repetition frequency.The ablation mechanism of the double-pulse drilling,intauding material preheating,melt flow accelerating and quasi-vacuum environment,was discussed respectively.These results are important for practical efficient laser drilling.
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