Detection of Density Jump in Laser-Induced Shock Wave Plasma Using A Rainbow Refractometer

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Abstract:

A special interferometric technique with high sensitivity has been devised on the basis of rainbow refractometry without the use of an additional and delicate amplitude-splitting setup. This new technique was used for the characterization of shock wave plasma induced by a Q-switched Nd:YAG laser on various metal samples under reduced surrounding gas pressures. An unmistakable signal of the density jump was detected simultaneously with the observation of the emission front signal. It proved that the emission front and the front of the blast wave coincided and moved together with time at the initial stage of the secondary plasma expansion. However, at a later stage, the emission front began to separate from and left behind the blast wave front propagating in the surrounding gas at low pressures. With the use of Cu and Zn samples, the experimental results showed that the separation of the emission front and blast wave front took place at about 5 mm above sample surface for laser energy of 140 mJ.

Keywords: BLAST; DENSITY; EMISSION; FRONT; JUMP; PLASMA; RAINBOW; REFRACTOMETER; SHOCK-WAVE; WAVE

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702011951308

Affiliations: 1: Applied Spectroscopy Laboratory, Graduate Program in Opto-Electrotechniques and Laser Application, The University of Indonesia, 4 Salemba Raya, Jakarta 10430, Indonesia 2: Applied Spectroscopy Laboratory, Graduate Program in Opto-Electrotechniques and Laser Application, The University of Indonesia, 4 Salemba Raya, Jakarta 10430, Indonesia 3: Department of Physics, Faculty of Education, Fukui University, 9-1 bunkyo 3-chome, Fukui 910, Japan 4: Department of Physics, Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology, 10 Ganesha, Bandung, Indonesia

Publication date: January 1, 2001

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