An analysis of the beam interaction characteristics of selected lasers with an alpha-alumina bioceramic

Lawrence, Jonathan (2004) An analysis of the beam interaction characteristics of selected lasers with an alpha-alumina bioceramic. Optics and Lasers in Engineering, 41 (3). pp. 505-514. ISSN 0143-8166

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Abstract

Certain differences between the interaction characteristics of a CO2 laser, a Nd:YAG laser and a high power diode laser (HPDL) with an alpha-alumina bioceramic have been investigated. For each laser the fluence threshold values at which significant material removal occurs were found graphically. Through the implementation of a derivative of Beer-Lambert’s law, the laser beam absorption lengths were calculated along with the thermal loading values. An examination of the laser induced meltpool propagation in the alpha-alumina revealed good agreement with the Stefan solution to the heat diffusion equation for the lasers. Absorptivity measurements revealed that there was no correlation between the actual absorptivity of the alpha-alumina and the absorption length for each of the three lasers on account of the absorptivity measurements being similar for each laser. However, differences in the depth of melting experienced by the alpha-alumina meant that it is reasonable to assume that absorption length is the principal influence on the melt depth.

Item Type:Article
Additional Information:Certain differences between the interaction characteristics of a CO2 laser, a Nd:YAG laser and a high power diode laser (HPDL) with an alpha-alumina bioceramic have been investigated. For each laser the fluence threshold values at which significant material removal occurs were found graphically. Through the implementation of a derivative of Beer-Lambert’s law, the laser beam absorption lengths were calculated along with the thermal loading values. An examination of the laser induced meltpool propagation in the alpha-alumina revealed good agreement with the Stefan solution to the heat diffusion equation for the lasers. Absorptivity measurements revealed that there was no correlation between the actual absorptivity of the alpha-alumina and the absorption length for each of the three lasers on account of the absorptivity measurements being similar for each laser. However, differences in the depth of melting experienced by the alpha-alumina meant that it is reasonable to assume that absorption length is the principal influence on the melt depth.
Keywords:Laser, Interaction characteristics, alpha-Alumina, Bioceramic
Subjects:H Engineering > H680 Optoelectronic Engineering
H Engineering > H700 Production and Manufacturing Engineering
Divisions:College of Science > School of Engineering
ID Code:3269
Deposited By:INVALID USER
Deposited On:05 Sep 2010 21:20
Last Modified:13 Mar 2013 08:45

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