Kurnia Lahna, Suhrawardi Ilyas, Setia Rahmati
One of the methods in assessing the quality of gemstones is by observing the degree of scattering of visible light inside or on the surface of the gemstones. This scattering phenomenon is determined by its optical characteristic and its stoichiometric compounds. In this study we analyze the internal scattering of red 633 nm HeNe laser light in several natural Aceh gemstones. We found that the degree of crystallinity and homogeneity of samples significantly affect scattering process inside the materials. Amorphous samples tend to transmit light and only scatter low amount of light, and samples with high degree of crystallinity tend to scatter light to all directions. Homogeneous samples has low degree of scattering, while nonhomogeneous samples scatter light with high degree of directionality. We also observed strong backscattering of light on some samples with high degree of crystalllinity. The utilization of laser on the raw materials of gemstone quality could help gemstone makers in cutting and grinding process in order to get high quality gemstone final products. © Published under licence by IOP Publishing Ltd.
Department of Physics, Faculty of Science, Syiah Kuala University, Darussalam, Banda Aceh, Brunei Darussalam
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