Eur. Phys. J. Appl. Phys.
Volume 25, Number 1, January 2004
|Page(s)||33 - 38|
|Section||Laser, Optics, Optoelectronics and Nanophotonics|
|Published online||25 November 2003|
Pulsed-laser ablation of polytetrafluoroethylene (PTFE) at various wavelengths
Applied Physics, Johannes-Kepler University Linz, Altenbergerstr. 69, 4040 Linz, Austria
Corresponding author: firstname.lastname@example.org
Revised: 18 August 2003
Accepted: 25 September 2003
Published online: 25 November 2003
The ablation rate of sintered polytetrafluoroethylene (PTFE) targets has been investigated as a function of wavelength within the range nm and pulse durations ns by means of various different lasers. In this parameter range, the apparent optical properties of targets and the depth of energy deposition are determined mainly by the scattering of the laser light. Therefore, measurements of the scattered light were performed for samples of various thicknesses by means of a modified UV-VIS spectrometer. For selected wavelengths, the angular distribution of the reflected and transmitted light intensity was determined. From these measurements, the coefficients for linear absorption, linear scattering and the scattering anisotropy were calculated using the inverse adding doubling algorithm. The results were tested by Monte Carlo simulation. With these coefficients the apparent optical penetration depths were estimated. These are about one order of magnitude larger than the ablation depths per pulse, which were determined from the weight loss of the targets. Laser deposition
PACS: 79.20.Ds – Laser-beam impact phenomena / 61.41.+e – Polymers, elastomers, and plastics / 81.15.Fg – Laser deposition
© EDP Sciences, 2004
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