Spatial characterization of the laser-induced plasma plumes generated by IR CO2 pulsed laser on carbon targets

Camacho, J.J.; Santos, M.; Díaz, Luis Eduardo; Poyato, J.M.L.

doi:10.1007/s00339-008-4814-6

Cited by 5 publications

(2 citation statements)

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“…These spectra ͑not shown͒ reproduce particular emission of carbon plasma in a mediumvacuum air atmosphere. 26,27 From all these spectra we can observe that the intensity of ionic species ͑C + , C 2+ , C 3+ , N + , and O + ͒ increases up to ϳ1 s and decays rapidly at high delay times. Above ϳ4 s these species are not observed.…”

Section: A Time-resolved Emission Spectra For Laser-induced Carbon Pmentioning

confidence: 93%

“…[8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] The wavelength and spatially resolved measurements of emission spectra of the CO 2 laser ablation plume at the carbon target have been reported recently by us. 26,27 The present paper is aimed at discussing thermochemical processes produced by a high-power IR CO 2 pulsed laser on graphite target and at evaluating laser ablation induced changes, which are of fundamental importance in establishing the mechanisms responsible for the plasma emission. In this work we present some new results obtained from the time-resolved spectroscopic analysis of the PLA plume.…”

Section: Introductionmentioning

confidence: 99%

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Temporal evolution of the laser-induced plasma generated by IR CO2 pulsed laser on carbon targets

Camacho

Díaz

Santos

et al. 2009

Journal of Applied Physics

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Time-resolved optical emission analysis was carried out for the plasma plume, produced by high-power tunable IR CO2 pulsed laser ablation of graphite, at λ=10.591 μm and in a regime of relatively high laser fluences (123–402 J/cm2). Wavelength-dispersed spectra of the plasma plume, at medium-vacuum conditions (4 Pa) and at 9.0 mm from the target, show ionized species (C+, C2+, C3+, C4+, N2+ , N+, and O+), neutral atoms (C, H, N, and O), and neutral diatomic molecules (C2, CN, OH, CH, and N2). In this work, we focus our attention on the temporal evolution of different atomic/ionic and molecular species over a broad spectral range from 190 to 1000 nm. The results show a faster decay for ionic fragments than for neutral atomic and molecular species. The velocity and kinetic energy distributions for different species were obtained from time-of-flight measurements using time-resolved optical emission spectroscopy. Possible mechanisms for the production of these distributions are discussed. Excitation temperature, electron density, and vibrational temperature in the laser-induced plasma were estimated from the analysis of spectral data at various times from the laser pulse incidence.

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Section: A Time-resolved Emission Spectra For Laser-induced Carbon Pmentioning

confidence: 93%