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Dynamics of laser induced micro-shock waves and hot core plasma in quiescent air

Published online by Cambridge University Press:  03 May 2013

Ch. Leela ,
Suman Bagchi ,
V. Rakesh Kumar ,
Surya P. Tewari  and
P. Prem Kiran
Ch. Leela
Affiliation:
Advanced Center of Research in High Energy Materials, University of Hyderabad, Gachibowli, Hyderabad, India
Suman Bagchi
Affiliation:
Advanced Center of Research in High Energy Materials, University of Hyderabad, Gachibowli, Hyderabad, India
V. Rakesh Kumar
Affiliation:
Advanced Center of Research in High Energy Materials, University of Hyderabad, Gachibowli, Hyderabad, India
Surya P. Tewari
Affiliation:
Advanced Center of Research in High Energy Materials, University of Hyderabad, Gachibowli, Hyderabad, India
P. Prem Kiran*
Affiliation:
Advanced Center of Research in High Energy Materials, University of Hyderabad, Gachibowli, Hyderabad, India
*
Address correspondence and reprint requests to: P. Prem Kiran, University of Hyderabad, Prof. C.R. Rao Road, Gachibowli, Hyderabad, India500046. E-mails: premkiranuoh@gmail.com, premsp@uohyd.ernet.in
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Abstract

We present our results on spatio-temporal evolution of laser plasma produced shockwaves (SWs) and hot core plasma (HCP) created by focused second harmonic (532 nm, 7 ns) of Nd-YAG laser in quiescent atmospheric air at f/#10 focusing geometry. Time resolved shadowgraphs imaged with the help of an ICCD camera with 1.5 ns temporal resolution revealed the presence of two co-existing sources simultaneously generating SWs. Each of the two sources independently led to a spherical SW following Sedov-Taylor theory along the laser propagation direction with a maximum velocity of 7.4 km/s and pressure of 57 MPa. While the interaction of SWs from the two sources led to a planar SW in the direction normal to the laser propagation direction. The SW detaches from the HCP and starts expanding into the ambient air at around 3 µs indicating the onset of asymmetric expansion of the HCP along the z-axis. The asymmetric expansion is observed till 10 µs beyond which the SW leaves the field of view followed by a deformation of the irradiated region in the XY-plane due to the penetration of surrounding colder air in to the HCP. The deformation in the XY-plane lasts till 600 µs. The dynamics of rapidly expanding HCP is observed to be analogous to that of cavitation bubble dynamics in fluids.

Keywords

Cavitation bubbleCounter pressure corrected point strong explosion theoryLaser induced plasmaSelf-focusingShock waves

Information

Type
Research Article
Information
Laser and Particle Beams , Volume 31 , Issue 2 , June 2013 , pp. 263 - 272
Copyright
Copyright © Cambridge University Press 2013 

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