Double pulse laser induced breakdown spectroscopy at 600 bar water pressure

Emde, Benjamin; Spiekermann, Sarah; Huse, Michael; Hermsdorf, Jörg; Neumann, Jörg; Frede, M.; Kaierle, Stefan

doi:10.1016/j.procir.2020.09.130

Cited by 5 publications

(3 citation statements)

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“…In addition, the influence of the pulse delay on the optical emission spectra was investigated using double-pulse LIBS. With up to 266 mJ, significantly higher pulse energies were used compared to previous studies [14,[17][18][19]. To investigate the cavity formation, high-speed images were taken using the shadowgraph technique.…”

Section: Discussionmentioning

confidence: 99%

“…Spectra obtained at low water pressure around 0.1 MPa with the same pulse delay have shown a similar course despite the enormous difference in pressure. This suggests that the pressure inside the cavity is approximately the same at the time of plasma generation for both situations [19].…”

Section: Introductionmentioning

confidence: 89%

“…In Ref. [19], water pressures of up to 60 MPa were generated using a pressure chamber to simulate the application of double-pulse LIBS in the deep sea at 6000 m. The studies have revealed that the measured spectra show a significantly increased line broadening and an increase in the continuum emission at high water pressure, which must be attributed to the short delay between the laser pulses. Due to the short lifetime of the cavity at high water pressure, the delay between the laser pulses must be short enough to generate the plasma before the cavity collapses.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of Laser-Induced Cavity and Plasma Formation in Water Using Double-Pulse LIBS

Siemens,

Emde,

Henkel

et al. 2024

Physics

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This paper deals with double-pulse laser-induced breakdown spectroscopy (LIBS) underwater, which is a promising analytical method for elemental analysis in the deep sea up to a water depth of 6000 m. A double-pulse laser with a wavelength of 1064 nm is used, which provides a pulse energy of up to 266 mJ for each laser pulse (in single pulse mode), a pulse width of 5–7 ns and a pulse delay in the range of 0.5 to 20 µs. In the double-pulse LIBS method, the first laser pulse creates a cavity on the material surface, and then the second laser pulse forms the plasma in this cavity. It is expected that the plasma is affected by the cavity’s size and lifetime. For this reason, the influence of focus position, pulse energy and pulse delay on the cavity and plasma formation at shallow water depth has been investigated.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

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