1 May 2014 Obsidianus lapis rugosity and hardness determination: fibre laser craftsmanship
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Abstract
Obsidianus lapis is a volcanic rock that has been worked into tools for cutting or weaponry by Teotihuacan people for hundreds of years. Currently it is used in jewelry or for house decorative items such as elaborated sculptures. From the physico-chemical properties point of view, obsidianus lapis is considered a glass as its composition is 80% silicon dioxide. In México there are different kinds of obsidianus lapis according to its colour: rainbow, black, brown, red, silver, golden and snowflake. The traditional grinding process for working with obsidianus lapis includes fixed grinders and sandpaper for the polishing process, where the craftsman grinds the rock manually obtaining a variety of shapes. Laser processing of natural stones is a relatively new topic. We propose the use of an Yb3+-doped fibre laser for cutting and ablating obsidianus lapis into spherical, rectangular and oval shapes. By means of a theoretical analysis of roughness and hardness, which affect the different surfaces and final shapes, and considering the changes in material temperature during laser interaction, this work will focus on parameter determination such as: laser fluence, incidence angle, laser average power and peak pulse energy, from the proposed Q-switched fibre laser design. Full optical, hardness and rugosity, initial and final, characterization will be included in the presentation.
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A. I. Aguilar-Morales, J. S. Velazquez-Gonzalez, S. Marrujo-García, J. I. Reyes-Sanchez, J. A. Alvarez-Chávez, "Obsidianus lapis rugosity and hardness determination: fibre laser craftsmanship", Proc. SPIE 9131, Optical Modelling and Design III, 913106 (1 May 2014); doi: 10.1117/12.2054457; https://doi.org/10.1117/12.2054457
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