Effects of temporal laser profile on the emission spectra for underwater laser-induced breakdown spectroscopy: Study by short-interval double pulses with different pulse durations

We investigate the effects of temporal laser profile on the emission spectra of laser ablation plasma in water. We use short-interval (76 ns) double pulses with different pulse durations of the composing two pulses for the irradiation of underwater target. Narrow atomic spectral lines in emission sp...

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Bibliographic Details
Published in:Journal of applied physics 2015-01, Vol.117 (2)
Main Authors: Tamura, Ayaka, Matsumoto, Ayumu, Nakajima, Takashi, Fukami, Kazuhiro, Ogata, Yukio H., Nishi, Naoya, Sakka, Tetsuo
Format: Article
Language:English
Subjects:
ABLATION
Applied physics
BREAKDOWN
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
Deformation
Emission analysis
EMISSION SPECTRA
EMISSION SPECTROSCOPY
EXCITATION
IRRADIATION
Laser ablation
Laser induced breakdown spectroscopy
LASER RADIATION
LASER-PRODUCED PLASMA
Lasers
Line spectra
PLASMA
PULSED IRRADIATION
Spectral emissivity
Spectrum analysis
UNDERWATER
WATER
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Summary:We investigate the effects of temporal laser profile on the emission spectra of laser ablation plasma in water. We use short-interval (76 ns) double pulses with different pulse durations of the composing two pulses for the irradiation of underwater target. Narrow atomic spectral lines in emission spectra are obtained by the irradiation, where the two pulses are wide enough to be merged into a single-pulse-like temporal profile, while deformed spectra are obtained when the two pulses are fully separated. The behavior of the atomic spectral lines for the different pulse durations is consistent with that of the temporal profiles of the optical emission intensities of the plasma. All these results suggest that continuous excitation of the plasma during the laser irradiation for ∼100 ns is a key to obtain narrow emission spectral lines.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4905392