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In previous works1 we examined the changes in the surface topography of sodium trisilicate glass (Na2O-3SiO2) with exposure to pulsed 248 nm excimer laser light at fluences of 2.6-5 J/cm2, as well as the character of the products emitted from the glass surface (e.g., +/- ions, electrons, ground state and excited neutral atoms and molecules). At these fluences, ablation readily occurs after a fixed...
YBa2Cu3O7−δ/PrBa2Cu3O7−δ, YBa2Cu3O7−δ/Pr0.7Y0.3Ba2Cu3O7−δ, and YBa2Cu3O7−δ/Pr0.5Ca0.5Ba2Cu3O7−δ superlattice structures have been grown by pulsed laser deposition. The superconducting properties of these YBa2Cu3O7−δ-based superlattices are shown to depend on the electronic properties of the barrier layers. In particular, the superconducting transition width decreases as the hole carrier density in...
Numerical and experimental work is presented to show the effects on the shape, magnitude, and phase of a photothermal deflection (PTD) signal due to changes in the thermophysical properties of the target and deflecting medium, and the distance of the probe beam from the surface. The PTD signals show qualitative agreement with the temperature gradient normal to the surface, calculated with a numerical...
Ablation of materials by highly-absorbed laser pulses (duration 200 μs) is modelled using a steady-state approach that takes into account target liquefaction. Material is removed by a combination of evaporation and ejection of liquid that is caused by radial evaporation-induced pressure gradients at the bottom of the ablation crater. As a result the evaporation rate is reduced and the drilling efficiency...
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