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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Bärwinkel, Mark ; Lorenz, Sebastian ; Stäglich, Robert ; Brüggemann, Dieter:
Influence of focal point properties on energy transfer and plasma evolution during laser ignition process with a passively q-switched laser.
In: Optics Express. Vol. 24 (11 July 2016) Issue 14 . - pp. 15189-15203.
ISSN 1094-4087
DOI: https://doi.org/10.1364/OE.24.015189

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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.