Abstract

A TEA CO₂ laser beam (500 mJ, 100 ns) has been focused on a Zn target at reduced ambient gas pressures. In order to confine the laser plasma into a limited space, a tube (7 × 7 × 20 mm) has been placed just in front of the target, and the laser beam has been focused through the tube of the target. The time-resolved spatial distributions of Zn emission lines show that emission intensity increases quickly with a distinct jump near the front of the plasma and that the emissions take place only in a limited thin layer. It is also shown that the displacement of the emission front is proportional to 0.6 power of time. These experimental results support the supposition that the plasma is excited by a plane shock wave induced by the laser bombardment. This laser plasma confinement technique shows the possibility of improving the sensitivity in laser microprobe spectrochemical analysis.

Shock Wave Generation in Air and in Water by CO₂ TEA Laser Radiation

C. E. Bell and B. S. Maccabee
Appl. Opt. 13(3) 605-609 (1974)

Direct evidence of laser-induced shock wave plasma from organic targets in low pressure He ambient gas, showing the effect of target hardness on its propagation speed and the resulted spectral performance

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Influence of surface roughness on nanosecond laser-induced shock wave enhancement effects

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Comparative study of Nd:YAG laser-induced breakdown spectroscopy and transversely excited atmospheric CO₂ laser-induced gas plasma spectroscopy on chromated copper arsenate preservative-treated wood

Ali Khumaeni, Zener Sukra Lie, Hideaki Niki, Yong Inn Lee, Kazuyoshi Kurihara, Motoomi Wakasugi, Touru Takahashi, and Kiichiro Kagawa
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Effect of focusing conditions on laser-induced shock waves at titanium–water interface

Arpita Nath and Alika Khare
Appl. Opt. 50(19) 3275-3281 (2011)