Shadowgraph of Pulse CO2 Laser Induced Breakdown in Different Pressure Air

Yu Zhang; Duan Yong Li; Tao Wu

doi:10.4028/www.scientific.net/AMR.887-888.1001

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 887-888Shadowgraph of Pulse CO2 Laser Induced Breakdown...

Shadowgraph of Pulse CO₂ Laser Induced Breakdown in Different Pressure Air

Abstract:

The expansion property of an infrared CO₂ laser produced air plasma is characterized using a high-speed imaging shadowgraph technique. The shadowgraphs were taken by a time-gated intensified charge-coupled device at various delay times after single pulses induced gas breakdown. We examined five incident laser energy of 180, 240, 345, 420 and 600 mJ induced air breakdown at the pressure of atmospheric and 10⁴ Pa. A shock wave produced by laser induced breakdown was also observed and its speed was measured as a function delay time between the breakdown and the shadow imaging under different air pressure. The experimental results indicated that the radial and axial shock wave front evolutions showed similar behavior, which increased fast with delay time at early stage and slowly at later stage. The propagation speed of the wavefront was about 2 cm/μs at the initial stage of breakdown, and then decreased very quickly. The propagation speed under low air pressure was higher than that of gases under high pressure and the spark sustained less time at lower pressure. The size of laser induced air spark increased with incident laser energy but not simple linear relationships.

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Periodical:

Advanced Materials Research (Volumes 887-888)

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1001-1004

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.887-888.1001

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Online since:

February 2014

Authors:

Yu Zhang*, Duan Yong Li, Tao Wu

Keywords:

Different Pressure, Laser Induced Air Plasma, Shadowgraph

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