Hsu Wei-Hung, Masim Frances Camille P, Porta Matteo, Nguyen Mai Thanh, Yonezawa Tetsu, Balčytis Armandas, Wang Xuewen, Rosa Lorenzo, Juodkazis Saulius, Hatanaka Koji
Opt Express. 2016 Sep 5;24(18):19994-20001. doi: 10.1364/OE.24.019994.
Femtosecond laser-induced hard X-ray generation in air from a 100-µm-thick solution film of distilled water or Au nano-sphere suspension was carried out by using a newly-developed automatic positioning system with 1-µm precision. By positioning the solution film for the highest X-ray intensity, the optimum position shifted upstream as the laser power increased due to breakdown. Optimized positioning allowed us to control X-ray intensity with high fidelity. X-ray generation from Au nano-sphere suspension and distilled water showed different power scaling. Linear and nonlinear absorption mechanism are analyzed together with numerical modeling of light delivery.
利用新开发的具有1微米精度的自动定位系统，在空气中对100微米厚的蒸馏水或金纳米球悬浮液溶液薄膜进行了飞秒激光诱导硬X射线的产生实验。通过将溶液薄膜定位以获得最高的X射线强度，由于击穿，随着激光功率的增加，最佳位置向上游移动。优化的定位使我们能够高保真地控制X射线强度。金纳米球悬浮液和蒸馏水产生的X射线表现出不同的功率缩放关系。结合光传输的数值模型对线性和非线性吸收机制进行了分析。
