Laser-induced plasma formation in water with up to 400 Millijoule double-pulse LIBS

Description

Double-pulse laser induced breakdown spectroscopy (LIBS) measurements in water with up to 600 bar and 400 mJ each pulse were done to select laser parameters which promote optimized spectral line emission from plasma even at elevated pressures, where line broadening until loss of the most spectral information can occur. Optical emission spectroscopy, using a Czerny-Turner spectrometer, has been applied to investigate the dependence of the emitted radiation on laser parameters and hydrostatic pressure. It has been found, that higher laser pulse energies, especially with high water pressure, can also have an adverse effect on the measured spectrum. The spectral data was measured with an Roper Acton Spectra Pro 500i with connected PI-MAX2 camera. All data is available in internal spe format and as converted tif files. A metdata file with all relevant parameters is provided in xml and json format. Plasma Source: Double-pulse laser - Application: deep sea mining, underwater LIBS - Specification: thermal - Properties: Double-pulse laser with up to 400 mJ each pulse, 1024 nm and 5-7 ns duration - Procedure: The first laser pulse creates a cavity on the material surface to be analysed and a second laser pulse forms the plasma inside the cavity. Medium: H2O - Properties: Tap water with a hydrostatic pressure of up to 600 bar Target: copper - Properties: Copper platelet Diagnostic: OES - Properties: OES with a Czerny-Turner spectrometer Roper Acton Spectra Pro 500i with connected PI-MAX2 camera - Procedure: The ratio between continuous and line radiation as well as the line broadening were examined

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