Micropillar fabrication on bovine cortical bone by direct-write femtosecond laser ablation

We investigated fabrication of cylindrical micropillars on bovine cortical bone using direct-write femtosecond laser ablation. The ablation threshold of the material was measured by single-pulse ablation tests, and the incubation coefficient was measured from linear scanned ablation tests. A motion...

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Bibliographic Details
Published in:Journal of Biomedical Optics 2009-11, Vol.14 (6), p.064021-0640210
Main Authors: Lim, Yong C, Altman, Katrina J, Farson, Dave F, Flores, Katharine M
Format: Article
Language:English
Subjects:
Algorithms
Animals
Bone and Bones - anatomy & histology
Bone and Bones - surgery
Bone and Bones - ultrastructure
bovine cortical bone
Cattle
femtosecond laser
Femur - anatomy & histology
Femur - surgery
Femur - ultrastructure
Laser Therapy - methods
micropillar
Models, Biological
Nanostructures
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Summary:We investigated fabrication of cylindrical micropillars on bovine cortical bone using direct-write femtosecond laser ablation. The ablation threshold of the material was measured by single-pulse ablation tests, and the incubation coefficient was measured from linear scanned ablation tests. A motion system was programmed to apply multiple layers of concentric rings of pulses to machine pillars of various diameters and heights. The diameter of the top surface of the pillar was found to steadily decrease due to incubation of damage from successive layers of pulses during the machining process. Pillar top diameter was predicted based on a paraxial beam fluence approximation and single-pulse ablation threshold and incubation coefficient measurements. Pillar diameters predicted as successive layers of pulses were applied were well-matched to experiments, confirming that femtosecond laser ablation of the cortical bone was well-modeled by single-pulse ablation threshold measurements and an incubation coefficient.
ISSN:1083-3668
1560-2281
DOI:10.1117/1.3268444