Spectral Characteristics of Coptis Chinensis Plasma Induced by Orthogonal Re-Heating Double-Pulse Laser

Jinmei Wang; Huijuan Zheng; Peichao Zheng; Guining Tan

doi:10.3788/CJL201845.0702006

Chinese Journal of Lasers, Volume. 45, Issue 7, 0702006(2018)

Spectral Characteristics of Coptis Chinensis Plasma Induced by Orthogonal Re-Heating Double-Pulse Laser

Jinmei Wang, Huijuan Zheng, Peichao Zheng^*, and Guining Tan

Chongqing Municipal Level Key Laboratory of Photoelectric Information Sensing and Transmission Technology, College of Optoelectronic Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China

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Figures & Tables(11)

Fig. 1. Experimental setup of orthogonal RDP-LIBS

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Fig. 2. Coptis Chinensis. (a) Purchased real objects; (b) samples after preparation

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Fig. 3. Spectral intensities and SBRs of four characteristic spectral lines versus detection delay. (a) Fe I; (b) CN; (c) Ca II; (d) Al I

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Fig. 4. Spectral intensities and SBRs of four characteristic spectral lines versus pulse interval under different energy groups. (a)(b) Fe I; (c)(d) CN; (e)(f) Ca II; (g)(h) Al I

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Fig. 5. Spectral intensities and SBRs of four characteristic spectral lines versus pulse interval (E1=15 mJ, E2=35 mJ, T1=1.5 μs). (a) Fe I; (b) CN; (c) Ca II; (d) Al I

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Fig. 6. Signal intensity comparison for SP-LIBS and RDP-LIBS

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Fig. 7. Boltzmann linear fitting of Ca II spectral line of Coptis Chinensis samples. (a) RDP-LIBS; (b) SP-LIBS

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Fig. 8. Electron excitation temperature of plasma versus detection delay

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Fig. 9. Electron number density of plasma versus detection delay

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Table 1. Enhancement factor of spectral intensity and RSD for four characteristic spectral lines
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Table 1. Enhancement factor of spectral intensity and RSD for four characteristic spectral lines
Characteristic spectral line Enhancement factor RSD of SP-LIBS /% RSD of RDP-LIBS /%
Fe I 358.17 nm 4.0 13.5 11.1
CN 388.34 nm 5.5 9.1 6.1
Ca II 393.37 nm 10.0 10.3 8.7
Al I 396.15 nm 3.5 21.0 11.3

Table 2. Spectral parameters of Ca II spectral line used for Boltzmann fitting

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Table 2. Spectral parameters of Ca II spectral line used for Boltzmann fitting

Wavelength λ/nm	Transition parameter	Weight factor ofup level g_k	Transitionprobability A_ki /s^-1	Energy /eV
Wavelength λ/nm	Transition parameter	Weight factor ofup level g_k	Transitionprobability A_ki /s^-1	E_k	E_i
317.93	3p⁶4d ²D_5/2→3p⁶4p ²P_3/2	6	3.6×10⁸	7.049150	3.150984
370.60	3p⁶5s ²S_1/2→3p⁶4p ²P_1/2	2	8.8×10⁷	6.467875	3.123349
373.69	3p⁶5s ²S_1/2→3p⁶4p ²P_3/2	2	1.7×10⁸	6.467875	3.150984
393.37	3p⁶4p ²P_3/2→3p⁶4s ²S_1/2	4	1.47×10⁸	3.150984	0
396.85	3p⁶4p ²P_1/2→3p⁶4s ²S_1/2	2	1.4×10⁸	3.123349	0

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Jinmei Wang, Huijuan Zheng, Peichao Zheng, Guining Tan. Spectral Characteristics of Coptis Chinensis Plasma Induced by Orthogonal Re-Heating Double-Pulse Laser[J]. Chinese Journal of Lasers, 2018, 45(7): 0702006

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