Raman spectroscopy with multiple-lasers for archaeological objects

本研究的目的是将激光拉曼光谱应用于考古物品，建立考古物品的拉曼光谱库。当激光照射到物品上时，拉曼散射会被样品产生的荧光所遮挡。此外，样品本身可能会吸收激发激光，大大降低了拉曼散射的效率。无论是哪种情况，为样品选择合适的激发激光都能确保良好的光谱。2004年试制了激光拉曼光谱仪试验装置。这次试验的一些缺陷被克服了。改进后的结果表明，改进后的分光镜具有较好的便携性和部分功能。最后一年，也就是2005年，对该试验装置的激光功率、分光镜旋转部分、电源等问题进行了检查，得到了最终的试验装置。在此基础上，研制了一台532 nm和785 nm两种激光的便携式激光拉曼光谱仪，并在实验室现有设备的基础上，对标准样品和考古材料进行了拉曼光谱测定。利用商业软件将这些拉曼光谱存储在数据库文件中。激光拉曼光谱已成为一种现场快速分析手段，具有重要意义。

The purposes of this research were development of laser Raman spectroscopy applied to archaeological objects and making a Raman spectrum library of archaeological materials.When irradiating the laser onto an object, Raman scattering may be obscured by the fluorescence that a sample produces. Moreover, the sample itself may absorb excitation laser, considerably reducing the efficiency of Raman scattering. Whatever the case may be, selecting the suitable excitation laser for the sample ensures a favorable spectrum. A trial equipment of laser Raman spectroscope was produced in 2004. Some defects of this trial one were conquered. As the results of this modification, portability and a part of spectroscope were unproved. In the last year, 2005, several problems, e.g., power of laser, rotation part of spectroscope, power supply, and so on, of this trial equipment were examined, a final equipment was obtained. By this improvement, a mobile laser Raman spectroscope with two lasers, i.e., 532 nm and 785 nm, has been completed for archaeological objects.With this mobile equipment and existing equipments of our laboratory, Raman spectra of standard samples and archaeological materials have been determined. These Raman spectra have been stored in a database file with use of commercial software. It is significant that laser Raman spectroscopy has become to as a quick analysis on-site.