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Investigation on the effects of laser parameters on the plasma profile of copper using picosecond laser induced plasma spectroscopy
摘要： Laser induced plasma generation and characterization, affected by laser parameters and sample physical properties, represent important phenomena in many fields of applications. In this work, we present new studies on the effects of an appropriate combination of laser wavelengths and pulse energies on the generated plasma characterization using a single shot picosecond Nd:YAG laser. The plasma plume of a pure copper sample has been generated by laser induced plasma spectroscopy (LIPS) using a single shot 170 ps laser pulse with wavelengths (266, 355, 532 and 1064 nm) and varying laser fluence (10–41 J/cm2). The spectral intensities of Cu I 324.75, 327.39, 515.32 and 521.82 nm have been observed. The plasma electron temperature and density have been determined from the Boltzmann plots and Stark-broadening profiles of the plasma spectral lines, respectively, assuming the local thermodynamic equilibrium (LTE) condition. It has been found that the electron temperature and electron density values increase from around 10,000 to 20,000 K and around 2 × 1017 to 1.5 × 1018 cm?3, respectively, with the increase in the laser wavelength and pulse fluence gradually. These observations can be understood due to the variations of mass-ablation rates, inverse-Bremsstrahlung, and photo-ionization with the studied pulse wavelength and pulse energy. The obtained results explore the opportunity to control specific generated plasma parameters by applying proper picosecond pulse parameters which can be considered in many fields of material science spectroscopic analysis and control the plasma interaction dynamics.
关键词： Stark-broadening,Picosecond,Boltzmann plot,Electron temperature,LTE,Laser induced plasma spectroscopy,Copper,Electron density,Plasma plume,LIPS
更新于2025-09-23 15:21:01
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Halogen detection with molecular laser induced fluorescence
摘要： The detection of low halogen concentrations by atomic Laser Induced Breakdown Spectroscopy (LIBS) is usually difficult due to the weak lines, which overlaps with matrix and due to an uncomfortable spectral region. Molecular LIBS (MLIBS) based on diatomic molecules of halogens with alkali earth element emission substantially increases sensitivity for halogen detection. We demonstrate that the Molecular Laser Induced Fluorescence (MLIF) method allows one to further increase the halogen detection approach. Practical application of the LIBS-MLIF method is demonstrated on Cl atom detection in concrete samples.
关键词： laser-induced plasma spectroscopy,diatomic molecular spectra
更新于2025-09-19 17:13:59
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Dynamics of laser-induced plasma splitting
摘要： The dynamics of splitting of the laser-induced plasma plume is investigated by spatiotemporal plasma imaging and spectroscopy. Plasma is induced on a copper target in a broad pressure range (10 ? 2 –10 5 Pa) and at varying laser pulse energies (5–40 mJ). Splitting the plume into fast and slow components is observed. The analysis of spatially resolved plasma images and spectra shows that the brightest emission region moves from the slow component to the fast component as time evolves. Copper atoms and ions, which radiate between 315 nm and 335 nm and between 485 nm and 504 nm, belong to the fast component whereas copper atoms, which radiate between 315 nm and 335 nm and between 505 nm and 525 nm, belong to the slow component. A charge separation ?eld is proposed to explain the separation of atoms and ions into the slow and fast components, correspondingly. The results can be of importance for laser induced breakdown spectroscopy, pulsed laser deposition, and nanoscale syntheses.
关键词： Laser induced plasma,Spectroscopy,Splitting,Imaging
更新于2025-09-12 10:27:22