Study on Characteristics of Laser Ablation in KTP Crystal and Its Influence on the Raman Spectroscopy
HAN Jing-hua1, DUAN Tao2, FAN Wei-xing1, 3, FENG Guo-ying1*, YANG Li-ming4, NIU Rui-hua1, YANG Jie1, ZHAI Ling-ling1, GUO Chao1
1. College of Electronics & Information Engineering, Sichuan University, Chengdu 610064，China 2. Laboratory for Extreme Conditions Matter Properties, Southwest University of Science and Technology, Mianyang 621010, China 3. Optimal Coatech Corporation Limited, Guangzhou 510730, China 4. Chengdu Fine Optical Engineering Research Center, Chengdu 610041, China
Abstract：The research and development of the KTP crystal with high threshold is of very importance for its application in high-energy laser systems. Ablation characteristics in KTP crystal as well as their influence on the Raman spectroscopy were studied by UV laser with high repetition frequency.The research results show that the laser plasma effects are the main reasons for the damage in the KTP crystal. The inverse bremsstrahlung absorption effect can increase the deposition of the laser pulse energy greatly; the ionization effect can make the crystal dislocated completely; shock wave effect can push away the mixture of melted, vaporized and ionized materials and cause cracks in the pit. Through investigation and comparison of the Raman spectroscopy before and after the laser ablation, it was found that the distribution characteristics of Raman peaks are almost the same, suggesting that the basic structures of KTP crystal do not change. But almost all the Raman characteristic peaks’ RIR values have changed and the widths are broadened, which means that the crystalline degree has been decreased. The Raman peaks of TiO6 and PO4 oxygen polyhedron shift to the lower wave number, which indicates that bonding force becomes weaker and the KTP crystal can be damaged easily.
韩敬华1，段 涛2，范卫星1, 3，冯国英1*, 杨李茗4, 牛瑞华1，杨 洁1，翟玲玲1，郭 超1 . KTP晶体的激光烧蚀特性及Raman光谱研究[J]. 光谱学与光谱分析, 2012, 32(07): 1820-1824.
HAN Jing-hua1, DUAN Tao2, FAN Wei-xing1, 3, FENG Guo-ying1*, YANG Li-ming4, NIU Rui-hua1, YANG Jie1, ZHAI Ling-ling1, GUO Chao1. Study on Characteristics of Laser Ablation in KTP Crystal and Its Influence on the Raman Spectroscopy. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2012, 32(07): 1820-1824.
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