Hydrogen alpha laser ablation plasma diagnostics

C. G. Parigger; D. M. Surmick; G. Gautam; A. M. El Sherbini

doi:10.1364/OL.40.003436

Optics Letters
Vol. 40,
Issue 15,
pp. 3436-3439
(2015)
•https://doi.org/10.1364/OL.40.003436

Hydrogen alpha laser ablation plasma diagnostics

C. G. Parigger, D. M. Surmick, G. Gautam, and A. M. El Sherbini

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C. G. Parigger, D. M. Surmick, G. Gautam, and A. M. El Sherbini, "Hydrogen alpha laser ablation plasma diagnostics," Opt. Lett. 40, 3436-3439 (2015)

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Abstract

Spectral measurements of the $H_{α}$ Balmer series line and the continuum radiation are applied to draw inferences of electron density, temperature, and the level of self-absorption in laser ablation of a solid ice target in ambient air. Electron densities of 17 to $3.2 \times 10^{24} m^{- 3}$ are determined from absolute calibrated emission coefficients for time delays of 100–650 ns after generation of laser plasma using $Q$ -switched Nd:YAG radiation. The corresponding temperatures of 4.5–0.95 eV were evaluated from the absolute spectral radiance of the continuum at the longer wavelengths. The redshifted, Stark-broadened hydrogen alpha line emerges from the continuum radiation after a time delay of 300 ns. The electron densities inferred from power law formulas agree with the values obtained from the plasma emission coefficients.

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Equations (6)

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$τ_{delay}$ [ns]	$N_{e}$ [ $10^{24} m^{- 3}$ ]	$H_{α}^{FWHM}$ [nm]	$N_{e}^{FWHM}$ [ $10^{24} m^{- 3}$ ]	${{}^{Oks}N}_{e}^{FWHM}$ [ $10^{24} m^{- 3}$ ]
400	5.9	21.4	6.0	7.9
450	4.9	19.0	5.1	6.6
500	4.0	16.0	4.0	5.0
550	3.8	15.5	3.8	4.8
600	3.5	14.6	3.5	4.4
650	3.2	13.8	3.3	4.0

$τ_{delay}$ [ns]	$〈 ε_{λ}^{ff} 〉$ [ $10^{8} W / (m^{3} nm sr)$ ]	$〈 κ_{λ}^{ff} 〉$ [ $m^{- 1}$ ]	$ρ$ [mm]	$τ$	SA
100	32	252	0.36	0.18	0.91
150	23	220	0.37	0.17	0.91
200	21	154	0.39	0.12	0.94
250	14.5	139	0.40	0.11	0.94
300	11	106	0.41	0.087	0.95
350	8.6	90	0.42	0.076	0.95
400	7.8	78	0.43	0.06	0.96
450	7.0	60	0.44	0.053	0.96
500	6.0	44	0.455	0.04	0.97
550	2.63	41	0.465	0.038	0.98
600	1.77	35.4	0.48	0.034	0.98
650	1.89	33.6	0.495	0.032	0.98

$τ_{delay}$ [ns]	$N_{e}$ [ $10^{24} m^{- 3}$ ]	$H_{α}^{FWHM}$ [nm]	$N_{e}^{FWHM}$ [ $10^{24} m^{- 3}$ ]	${{}^{Oks}N}_{e}^{FWHM}$ [ $10^{24} m^{- 3}$ ]
400	5.9	21.4	6.0	7.9
450	4.9	19.0	5.1	6.6
500	4.0	16.0	4.0	5.0
550	3.8	15.5	3.8	4.8
600	3.5	14.6	3.5	4.4
650	3.2	13.8	3.3	4.0

$τ_{delay}$ [ns]	$〈 ε_{λ}^{ff} 〉$ [ $10^{8} W / (m^{3} nm sr)$ ]	$〈 κ_{λ}^{ff} 〉$ [ $m^{- 1}$ ]	$ρ$ [mm]	$τ$	SA
100	32	252	0.36	0.18	0.91
150	23	220	0.37	0.17	0.91
200	21	154	0.39	0.12	0.94
250	14.5	139	0.40	0.11	0.94
300	11	106	0.41	0.087	0.95
350	8.6	90	0.42	0.076	0.95
400	7.8	78	0.43	0.06	0.96
450	7.0	60	0.44	0.053	0.96
500	6.0	44	0.455	0.04	0.97
550	2.63	41	0.465	0.038	0.98
600	1.77	35.4	0.48	0.034	0.98
650	1.89	33.6	0.495	0.032	0.98

Abstract

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Figures (4)

Tables (2)

Equations (6)

Optics Letters