Pulse duration dependence of dry laser peening effects in the femtosecond-to-picosecond regime
Pulse duration dependence of dry laser peening effects in the femtosecond-to-picosecond regime
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DOI：
10.35848/1882-0786/abfca2
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发表时间：
2021-06-01
影响因子：
2.3
通讯作者：
Sano, Tomokazu
中科院分区：
文献类型：
--
作者：
Nishibata, Itsuki;Yoshida, Masayuki;Sano, Tomokazu
在飞秒到皮秒范围内，当激光强度超过空气击穿阈值时，我们发现了干式激光喷丸的最佳脉冲宽度。在激光能量恒定的条件下，1ps的脉冲持续时间产生最有效的喷丸效果；这是由于光束膨胀小于1ps导致的激光通量降低，以及高于1ps的热效应增加所致。当激光强度超过空气击穿阈值时，需要在考虑激光-空气和激光-金属相互作用的同时选择脉冲宽度。
We found an optimum pulse duration for dry laser peening in the femtosecond-to-picosecond regime, in which the laser intensity exceeds the air breakdown threshold. A pulse duration of 1 ps produced the most effective peening effects under conditions wherein the laser energy was constant; this was caused by a decrease in the laser fluence due to a beam expansion of less than 1 ps, in addition to an increase in the thermal effect above 1 ps. When the laser intensity exceeds the air breakdown threshold, it is necessary to select the pulse duration while considering laser-air and laser-metal interactions.