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Title of Journal: Appl Phys B

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Abbravation: Applied Physics B

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Springer-Verlag

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DOI

10.1007/s10404-008-0370-9

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1432-0649

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Spatially temporally and spectrally resolved mea

Authors: N Kawahara JL Beduneau T Nakayama E Tomita Y Ikeda
Publish Date: 2006/12/19
Volume: 86, Issue: 4, Pages: 605-614
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Abstract

Images and emission spectra of sparks produced by laserinduced breakdown in air were investigated with a high degree of spatial and temporal resolution The laserinduced breakdown was generated by focusing a 532nm nanosecond pulse from a Qswitched NdYAG laser The data were collected using a framing intensified charged coupled device CCD camera and a multifiber Cassegrain optics system coupled to an intensified CCD spectrometer The results provided information about the different stages of laserinduced breakdown The plasma shape and emission spectrum were very reproducible Different ionization levels in the plasma kernels which were observed using the high spatial resolution of the multifiber Cassegrain optics system occurred during the plasma formation and cooling and at different locations within the plasma This was due mainly to the thickness of the plasma relative to the laser wavelength which created different ionization levels and energy absorption rates throughout These observations were correlated with the plasma visualizations obtained with the framing ICCD camera The plasma emission analysis permitted us to study the temperature evolution along the plasma during the laserinduced breakdown process The analysis demonstrated the validity of a lasersupported wave model during the first stages of laserinduced breakdown and illustrated the weak dependence of the plasma temperature on the input energy

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