Article

Analysis of optodynamic sources generated during laser-induced breakdown in water.

Faculty of Mechanical Engineering, University of Ljubljana, Askerceva 6, SI-1000 Ljubljana, Slovenia.
Ultrasonics (impact factor: 1.84). 01/2007; 44 Suppl 1:e1255-8. DOI:10.1016/j.ultras.2006.05.078 pp.e1255-8
Source: PubMed

ABSTRACT We propose a method for evaluating the size of the laser-induced breakdown region in water based on the detection and analysis of optodynamic waves. The breakdown region is an optodynamic source of pressure waves that propagate into the surrounding liquid as an ultrasonic pulse. In the experiment the optical breakdown was generated by a standard ophthalmic Nd:YAG laser with a pulse duration of 10 ns and a maximum energy per pulse of 10 mJ. The pulses were detected inside the liquid with a laser-beam deflection probe. The waveforms were captured in the far-field and analyzed. The analysis provides information about the apparent size of the optodynamic source, which is directly related to the size of the breakdown region. The proposed method can be adapted for online monitoring.

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Keywords

apparent size
 
breakdown region
 
far-field
 
laser-beam deflection probe
 
laser-induced breakdown region
 
optical breakdown
 
optodynamic source
 
optodynamic waves
 
pressure waves
 
proposed method
 
pulse duration
 
pulses
 
surrounding liquid
 
ultrasonic pulse
 

Rok Petkovsek