Measurements of aluminum and hydrogen microplasma

Christian G. Parigger; James O. Hornkohl; László Nemes

doi:10.1364/AO.46.004026

Applied Optics
Vol. 46,
Issue 19,
pp. 4026-4031
(2007)
•https://doi.org/10.1364/AO.46.004026

Measurements of aluminum and hydrogen microplasma

Christian G. Parigger, James O. Hornkohl, and László Nemes

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Christian G. Parigger, James O. Hornkohl, and László Nemes, "Measurements of aluminum and hydrogen microplasma," Appl. Opt. 46, 4026-4031 (2007)

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Abstract

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 $10 ns$ IR laser radiation shows Stark-broadened and shifted atomic lines. An analysis of the $H_{α}$ and $H_{β}$ Balmer series lines and selected aluminum lines allows one to determine electron number density in the range of $0.01 - 10 \times 10^{18} {cm}^{- 3}$ early in the plasma decay. Atomic and molecular features are investigated for diagnostic applications in laser material processing.

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Delay[ns]	Width[nm]	Shift[nm]	N _e [10¹⁸ cm⁻³]
25	0.59 ± 0.08	0.28 ± 0.03	1.2 ± 0.5^a
30	0.52 ± 0.08	0.25 ± 0.03	1.0 ± 0.5^a
50	0.25 ± 0.05	0.16 ± 0.03	0.9 ± 0.4^a
100	0.17 ± 0.05	0.095 ± 0.03	0.3 ± 0.05^b
150	0.15 ± 0.05	0.042 ± 0.02	0.2 ± 0.02^b
200	0.084 ± 0.04	0.036 ± 0.02	0.1 ± 0.01^b
400	0.002 ± 0.04	0.027 ± 0.02	0.05 ± 0.01^b

Delay[ns]	Width[nm]	Shift[nm]	N _e [10¹⁸ cm⁻³]
25	0.72 ± 0.08	0.31 ± 0.03	1.2 ± 0.5^a
30	0.61 ± 0.08	0.29 ± 0.03	1.0 ± 0.5^a
50	0.42 ± 0.08	0.17 ± 0.05	0.9 ± 0.4^a
100	0.26 ± 0.08	0.11 ± 0.05	0.3 ± 0.05^b
150	0.22 ± 0.05	0.053 ± 0.03	0.2 ± 0.02^b
200	0.087 ± 0.04	0.047 ± 0.03	0.1 ± 0.01^b
400	0.003 ± 0.04	0.038 ± 0.03	0.05 ± 0.01^b

Delay[ns]	Width[nm]	N _e[10¹⁸ cm⁻³]	Shift[nm]	N _e [10¹⁸ cm⁻³]
25	8.1 ± 2.0	1.2 ± 0.5	0.55 ± 0.08	1.0 ± 0.3
30	7.25 ± 1.0	1.0 ± 0.5	0.54 ± 0.05	0.9 ± 0.3
50	5.0 ± 0.8	0.9 ± 0.4	0.43 ± 0.04	0.7 ± 0.3
75	3.8 ± 0.5	0.5 ± 0.3	0.21 ± 0.03	0.3 ± 0.2
100	2.5 ± 0.3	0.3 ± 0.1	0.11 ± 0.03	0.2 ± 0.1
150	1.8 ± 0.3	0.2 ± 0.05	0.09 ± 0.02	0.2 ± 0.1
200	1.3 ± 0.2	0.1 ± 0.05	0.06 ± 0.02	0.1 ± 0.1
400	0.8 ± 0.1	0.05 ± 0.025	0.03 ± 0.02	0.05 ± 0.05

Delay[ns]	Width[nm]	N _e [10¹⁸ cm⁻³]	Separation[nm]
75	12.3 ± 2.0	0.4 ± 0.04	3.7 ± 2.0
100	9.1 ± 0.7	0.3 ± 0.03	2.3 ± 1.0
150	6.3 ± 0.5	0.2 ± 0.02	1.5 ± 0.3
200	5.3 ± 0.4	0.1 ± 0.01	1.2 ± 0.2
400	2.6 ± 0.4	0.05 ± 0.005	0.4 ± 0.2

Delay[ns]	Width[nm]	Shift[nm]	N _e [10¹⁸ cm⁻³]
25	0.59 ± 0.08	0.28 ± 0.03	1.2 ± 0.5^a
30	0.52 ± 0.08	0.25 ± 0.03	1.0 ± 0.5^a
50	0.25 ± 0.05	0.16 ± 0.03	0.9 ± 0.4^a
100	0.17 ± 0.05	0.095 ± 0.03	0.3 ± 0.05^b
150	0.15 ± 0.05	0.042 ± 0.02	0.2 ± 0.02^b
200	0.084 ± 0.04	0.036 ± 0.02	0.1 ± 0.01^b
400	0.002 ± 0.04	0.027 ± 0.02	0.05 ± 0.01^b

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Applied Optics