Analysis of time-resolved laser plasma ablation using an imaging spectra technique

Abstract

Pulsed laser deposition (PLD) is extensively employed for the growth of thin films. The laser-material interaction involves complex processes of heating, melting, vaporization, ejection of atoms, ions and molecules, shock waves, plasma initiation, expansion and deposition onto a substrate. The understanding of the spatial and temporal distribution of a plasma parameters in a laser-produced plasma is important to the control of thin film growth process. In this work we have studied the dynamics of laser ablated graphitic carbon plasma expanding into vacuum using a spectroscopic imaging suitable as an in situ & automated diagnostic sampling technique for PLD. Time-resolved spectra, that were also spatially resolved in one dimension along the axis of plasma expansion, were obtained using a time-gated intensified charge-coupled device (ICCD) coupled to a stigmatic Czerny-Turner spectrograph. Plasma parameters such as electron density, temperature and plume velocity expansion were extracted directly from the analysis of the C II (2s 2 3d-2s 2 4f) transition.

Optical diagnostics of gold plasmas produced by infrared laser ablation

“…The LPP spectra of Au were studied as a function of the emitted wavelength, delay time after the start of the laser pulse and distance from the target surface. Different authors [28][29][30][31][32][33][34][35][36] have previously described this type of study. The spatiotemporal evolution of the optical emissions was studied to understand the dynamics of the laser-ablated Au plasma.…”

Imaging spectroscopy of Ag plasmas produced by infrared nanosecond laser ablation

“…Different authors [17][18][19][20][21][22][23][24][25][26][27][28][29][30] have previously described this kind of study. In order to study the plasma-plume expansion dynamics of different species, we plotted spectrally resolved 1D-spatial and 1D-spectral imaging mode for different delay times.…”

Stagnation layers at the collision front between two laser-induced plasmas: A study using time-resolved imaging and spectroscopy

“…The spectrometer was equipped with a 1200 groove/mm diffraction grating blazed at 400 nm, which gave a reciprocal linear dispersion of 1.6 nm/mm and a measurement accuracy of better than ±0.07 nm [11,22]. The instrument function of the spectrometer was found to have a width of 0.16 nm (FWHM) [22]. A CCD camera, lens coupled to a MCP, provided time-resolved spectral readout with a gate width (exposure time) of ca.…”