液相脉冲激光烧蚀法合成纳米颗粒是一种绿色环保的制备方法。基于该方法搭建了一套氧化铟锡（ITO）纳米颗粒制备系统，该系统采用皮秒激光作为光源辐照去离子水中的氧化铟锡固体靶材，最终合成出ITO纳米颗粒。随着入射脉冲能量的增加及激光辐照时间的增长，激光烧蚀效率明显增大，ITO产量增多。采用扫描电子显微镜（SEM）及X射线能谱仪（EDS）对制备的ITO纳米颗粒进行表征，所制备的纳米颗粒不含除铟（In）、锡（Sn）之外的杂质成分，纯度较高且72%的ITO纳米颗粒粒径大小在20～50 nm之间。

We report a universal approach based on the surface plasmon resonances (SPRs) attained in filamentation in water doped with gold nanoparticles for enhancing the nonlinear refractive index. The filament-induced supercontinuum spectrum in water overlaps with SPRs of gold nanospheres, which further leads to a modification on the Kerr nonlinear refractive index. In our experiment, the measured nonlinear refractive index (n₂) in water doped with gold nanoparticles increases by six times, as compared with that in pure water. Such enhancement may be useful for filament-induced nonlinear applications with modest incident intensity.

We present a method to precisely determine the hyperfine structure constants of the rubidium 5D5/2 and 7S1/2 states in a cascade atomic system. The probe laser is coupled to the 5S1/2→5P3/2 hyperfine transition, while the coupling laser is scanned over the 5P3/2→5D5/2(7S1/2) transition. The high-resolution double-resonance optical pumping spectra are obtained with two counter-propagating laser beams acting on rubidium vapor. The hyperfine splitting structures are accurately measured by an optical frequency ruler based on the acousto-optic modulator, thus, the magnetic dipole hyperfine coupling constant A and quadrupole coupling constant B are determined. It is of great significance for the atomic hyperfine structure and fundamental physics research.