Oxygen spectral lines for diagnostics of atmospheric laser-induced plasmas |
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Authors: | H Hegazy |
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Institution: | 1. Plasma Physics Dept., N.R.C., Egyptian Atomic Energy Authority, 13759, Enshass, Egypt
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Abstract: | In the present study OI spectral lines are measured, tested, and developed for diagnostics of laser-induced plasma experiments in air. The plasma plume was generated by the interaction of a 6-ns 750-mJ Nd:YAG laser at the fundamental wavelength of 1.06 µm with a standard Al target of known elemental composition in air. The emitted spectrum was in the range 200–1000 nm and was recorded using an Echelle spectrograph equipped with a time-gated ICCD camera. The measurements were performed at several delay times (0–10 µs). Based on LTE assumption, the excitation temperature is derived using a Boltzmann plot of OI emission lines. The FWHM of the Stark broadened OI line at 844.65 nm is used for electron density measurements at different times. |
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