Fast imaging of laser-blow-off plume: Lateral confinement in ambient environment

George, Sony; Kumar, Ajai; Singh, R. K.; Nampoori, V. P. N.
April 2009
Applied Physics Letters;4/6/2009, Vol. 94 Issue 14, p141501
Academic Journal
The dynamics of plasma plume, formed by the laser-blow-off of multicomponent LiF-C thin film under various ambient pressures ranging from high vacuum to argon pressure of 3 Torr, has been studied using fast imaging technique. In vacuum, the plume has ellipsoidal shape. With the increase in the ambient pressure, sharp plume boundary is developed showing a focusing-like (confinement in the lateral space) behavior in the front end, which persists for long times. At higher ambient pressure (>10-1 Torr), structures are developed in the plasma plume due to hydrodynamic instability/turbulences.


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