Influence of focal point properties on energy transfer and plasma evolution during laser ignition process with a passively q-switched laser.
Influence of focal point properties on energy transfer and plasma evolution during laser ignition process with a passively q-switched laser.
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DOI：
10.1364/oe.24.015189
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发表时间：
2016-07
期刊：
影响因子：
3.8
通讯作者：
M. Bärwinkel;S. Lorenz;R. Stäglich;D. Brüggemann
中科院分区：
文献类型：
--
作者：
M. Bärwinkel;S. Lorenz;R. Stäglich;D. Brüggemann
小型化被动调q激光点火系统是一种很有前途的替代传统点火源，以确保在困难条件下可靠的点火。在这项研究中，焦点特性的影响，从激光到等离子体的能量传递，以及等离子体的形成和传播的激光诱导点火过程的第一步进行了研究。最大注量和注量体积的引入来表征不同的激光脉冲能量和聚焦配置的焦点特性。结果表明，随着最大注量的增加，激光能量的传递也随之增加。在激光发射期间，等离子体沿着聚焦激光束的光束路径传播。提高最大注量导致血浆体积增加，但当注量体积达到其最大值时膨胀饱和。
Miniaturized passively q-switched laser ignition systems are a promising alternative to conventional ignition sources to ensure a reliable ignition under difficult conditions. In this study the influences of focal point properties on energy transfer from laser to plasma as well as plasma formation and propagation are investigated as the first steps of the laser induced ignition process. Maximum fluence and fluence volume are introduced to characterize focal point properties for varying laser pulse energies and focusing configurations. The results show that the transferred laser energy increases with increasing maximum fluence. During laser emission plasma propagates along the beam path of the focused laser beam. Rising maximum fluence results in increased plasma volume, but expansion saturates when fluence volume reaches its maximum.