Tunable laser photoluminescence and excitation spectroscopy for gemstone analysis

Tsung-Han Tsai; Zhen Wang

doi:10.1117/12.3026223

1 October 2024 Tunable laser photoluminescence and excitation spectroscopy for gemstone analysis

Tsung-Han Tsai, Zhen Wang

Proceedings Volume 13130, Novel Optical Systems, Methods, and Applications XXVII; 1313003 (2024) https://doi.org/10.1117/12.3026223
Event: Optical Engineering + Applications, 2024, San Diego, California, United States

Abstract

Fluorescence appears in most gemstones when exposed to specific irradiation, playing a crucial role in mineral identification and color treatments detection. Traditional visual evaluation under mercury vapor lamps has limitations, leading to inconsistencies in fluorescence analysis. This study introduces tunable laser-based spectroscopy for gemstone analysis. Unlike visual methods, spectroscopy enhances reliability by examining luminescence across the UV to NIR spectrum, while tunable laser provides different excitation wavelengths. The developed system targets gemstone treatments and synthetic material analysis, including diamonds and corundums (ruby and sapphires). Analysis of commercially valuable gemstones demonstrates the system’s capability in gemstone identification. Examples include laboratory-grown diamonds with natural diamond-like features, heat-treated and untreated natural blue sapphires, and the evaluation of the relationship between the orange emission feature and color stability in photochromic sapphires. These findings ensure transparency in the jewelry trade by identifying unclaimed treatments and synthetic materials, as well as contributing to a more comprehensive understanding of gemstone luminescence.

Conference Presentation

Citation Download Citation

Tsung-Han Tsai and Zhen Wang "Tunable laser photoluminescence and excitation spectroscopy for gemstone analysis", Proc. SPIE 13130, Novel Optical Systems, Methods, and Applications XXVII, 1313003 (1 October 2024); https://doi.org/10.1117/12.3026223

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