Journal
JOURNAL OF BIOMEDICAL OPTICS
Volume 14, Issue 6, Pages -Publisher
SPIE-SOC PHOTO-OPTICAL INSTRUMENTATION ENGINEERS
DOI: 10.1117/1.3268444
Keywords
bovine cortical bone; femtosecond laser; micropillar
Funding
- National Science Foundation [EEC-0425626]
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [0826077] Funding Source: National Science Foundation
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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. (C) 2009 Society of Photo-Optical Instrumentation Engineers. [DOI: 10.1117/1.3268444]
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