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

Abstract

Articles you may be interested inPreliminary design of laser-induced breakdown spectroscopy for proto-Material Plasma Exposure eXperimenta) Rev. Sci. Instrum. 85, 11D806 (2014); 10.1063/1.4885472Convoluted effect of laser fluence and pulse duration on the property of a nanosecond laser-induced plasma into an argon ambient gas at the atmospheric pressureWe 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. V C 2015 AIP Publishing LLC.

Transfer of the Species Dissolved in a Liquid into Laser Ablation Plasma: An Approach Using Emission Spectroscopy

“…This indicates that the dissolved species are transferred to the periphery of the plasma. In the case of long pulse, the plasma is largely expanded and persists longer in the bubble due to long-continued excitation of the plasma during the pulse, ,,, and hence, mixing of the plasma and the vapor layer will be promoted. Note that the emission lines of the species originating in the solution can be observed even at the center part of the plasma at ∼1000 ns …”

Clear observation of the formation of nanoparticles inside the ablation bubble through a laser-induced flat transparent window by laser scattering

“…The most commonly used one is the time-resolved shadowgraphy, [7][8][9] but it can only measure the time-varying shape of the bubble. For this reason the shadowgraphy is often employed with other techniques such as plasma spectroscopy, [10][11][12][13] optical beam deflection, 14,15 light scattering, [16][17][18][19] and x-ray scattering. [20][21][22][23] The use of highspeed camera also helps a lot to track the bubble evolution after the single ablation event.…”