We report time-averaged and time-resolved emission spectra subsequent to laser-induced optical breakdown of aluminum in laboratory air and in hydrogen gas. The microplasma generated by nominal 10\text{\hspace{0.17em} ns} IR laser radiation shows Stark-broadened and shifted atomic lines. An analysis of the {\text{H}}_{\alpha } and {\text{H}}_{\beta } Balmer series lines and selected aluminum lines allows one to determine electron number density in the range of 0.01–10\times {10}^{18}{\text{cm}}^{-3} early in the plasma decay. Atomic and molecular features are investigated for diagnostic applications in laser material processing.

© 2007 Optical Society of America

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