by J. Lamela, G. Lifante, T. P. J. Han, F. Jaque, A. García-Navarro, J. Olivares and F. Agulló-López
Abstract:
The surface morphology of the ablation craters generated in LiNbO3 by 130fs laser pulses at 800nm has been investigated by AFM/SNOM microscopy. The single pulse fluence corresponding to the ablation threshold has been estimated to be ≈1.8J/cm2. A complex structure including random cone-shaped protrusions is observed inside the ablated crater. The scale of the protrusion spacing is in the submicron range and the heights are typically of a few tens of nanometers. At and outside the crater rim a novel quasi-periodic wave-like topography pattern is observed in both types of microscopy techniques. The average wavelength, that is slightly dependent on pulse fluence, is (500–800nm) comparable to the light wavelength. This novel topography feature keeps a close similarity with a Fresnel diffraction pattern by an absorbing circular obstacle or impact wave pattern produced by a combination of heat and shock wave (resemble that of impact crater). It is proposed that the obstacle is associated to the strongly nonlinear multiphoton absorption at the peak of the pulse profile. The energy deposited by nonlinear absorption of such profile causes ablation of both the crater and the rippled structure.
Reference:
J. Lamela, G. Lifante, T. P. J. Han, F. Jaque, A. García-Navarro, J. Olivares and F. Agulló-López, “Morphology of ablation craters generated by fs laser pulses in LiNbO3”, Applied Surface Science, vol. 255, no. 7, pp. 3918–3922.
Bibtex Entry:
@article{lamela_morphology_2009,
title = {Morphology of ablation craters generated by fs laser pulses in {LiNbO3}},
volume = {255},
issn = {0169-4332},
url = {http://www.sciencedirect.com/science/article/pii/S0169433208019144},
doi = {10.1016/j.apsusc.2008.08.111},
abstract = {The surface morphology of the ablation craters generated in LiNbO3 by 130fs laser pulses at 800nm has been investigated by AFM/SNOM microscopy. The single pulse fluence corresponding to the ablation threshold has been estimated to be ≈1.8J/cm2. A complex structure including random cone-shaped protrusions is observed inside the ablated crater. The scale of the protrusion spacing is in the submicron range and the heights are typically of a few tens of nanometers. At and outside the crater rim a novel quasi-periodic wave-like topography pattern is observed in both types of microscopy techniques. The average wavelength, that is slightly dependent on pulse fluence, is (500–800nm) comparable to the light wavelength. This novel topography feature keeps a close similarity with a Fresnel diffraction pattern by an absorbing circular obstacle or impact wave pattern produced by a combination of heat and shock wave (resemble that of impact crater). It is proposed that the obstacle is associated to the strongly nonlinear multiphoton absorption at the peak of the pulse profile. The energy deposited by nonlinear absorption of such profile causes ablation of both the crater and the rippled structure.},
number = {7},
urldate = {2017-10-06},
journal = {Applied Surface Science},
author = {Lamela, J. and Lifante, G. and Han, T. P. J. and Jaque, F. and García-Navarro, A. and Olivares, J. and Agulló-López, F.},
month = jan,
year = {2009},
keywords = {LiNbO, SNOM, UV radiation damage},
pages = {3918--3922},
file = {ScienceDirect Full Text PDF:E:\cmam_papers\files\1002\Lamela et al. - 2009 - Morphology of ablation craters generated by fs las.pdf:application/pdf;ScienceDirect Full Text PDF:E:\Usuarios\Administrator\Zotero\storage\KWIMUDS2\Lamela et al. - 2009 - Morphology of ablation craters generated by fs las.pdf:application/pdf;ScienceDirect Snapshot:E:\cmam_papers\files\1001\S0169433208019144.html:text/html;ScienceDirect Snapshot:E:\Usuarios\Administrator\Zotero\storage\22QMRJF5\S0169433208019144.html:text/html},
}