Pulsed-laser ablation of polytetrafluoroethylene (PTFE) at various wavelengths

Issue		Eur. Phys. J. Appl. Phys. Volume 25, Number 1, January 2004


Page(s)		33 - 38
Section		Lasers, Optics and Telecommunications
DOI		10.1051/epjap:2003083
Published online		25 November 2003

Eur. Phys. J. Appl. Phys. 25, 33-38 (2004)
DOI: 10.1051/epjap:2003083

Pulsed-laser ablation of polytetrafluoroethylene (PTFE) at various wavelengths

N. Huber, J. Heitz and D. Bäuerle

Applied Physics, Johannes-Kepler University Linz, Altenbergerstr. 69, 4040 Linz, Austria

johannes.heitz@jku.at

(Received: 11 December 2002 / Received in final form: 18 August 2003 / Accepted: 25 September 2003 / Published online: 25 November 2003 )

Abstract
The ablation rate of sintered polytetrafluoroethylene (PTFE) targets has been investigated as a function of wavelength within the range $193 \le \lambda \le 1064$ nm and pulse durations $5 \le \tau _{l} \le 25$ 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.

© EDP Sciences 2004

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