Effect of chopping on laser penetration of metal targets
作者:
H. S. Kim,
Y. Domankevitz,
H. S. Kwok,
J. A. Copley,
期刊:
Applied Physics Letters
(AIP Available online 1989)
卷期:
Volume 55,
issue 8
页码: 726-728
ISSN:0003-6951
年代: 1989
DOI:10.1063/1.101787
出版商: AIP
数据来源: AIP
摘要:
A new technique for increasing the laser penetration efficiency of metals has been developed. By amplitude modulating a free‐running neodymium:yttrium aluminum garnet laser pulse, the depth of the crater was increased and the threshold energy for reliable hole drilling was decreased significantly. It was observed that the effect of chopping was optimal at 8–12 kHz with a 70% duty cycle. We believe that this improvement is due to an increase in the vapor recoil pressure and reduced plasma screening. Possible acoustic resonance effects have also been considered and will be discussed.
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