影响空间变化偏振矢量光束强聚焦后焦斑移位的因素

利用衍射积分公式数值模拟了不同阶次的空间变化偏振矢量贝塞尔高斯(BG)光束经过强聚焦系统后在焦点附近的强度分布。数值结果显示空间变化偏振矢量BG光束聚焦后在光束传播轴负方向存在焦斑移位现象,其焦斑移位的大小与光束的模阶次、光束宽度、波长以及局部偏振状态密切相关。矢量光束偏振态的变化依靠液晶相位延迟器(LCVR)的相位延迟角度来控制,由于LCVR的相位延迟角度可以在0～π之间连续变化,从而改变光束的局部偏振状态,间接实现了对矢量光束焦斑移位大小的实时控制,在光学微操纵领域具有潜在的应用价值。     

超强飞秒激光驱动气体靶致X光源的背光成像

在拍瓦级飞秒激光装置上完成了两轮激光驱动甲烷气体靶的实验,用产生的X光源配合SCCD（转换屏+CCD相机）对小型金属器件背光成像,采用经验公式和PIC数值模拟方法分别预估了超热电子温度,得到X光能量分别为377 keV和130 keV,据此两轮实验分别选择1.3 mm和0.8 mm厚度的轫致辐射体。分析比较了两轮实验背光成像质量。通过对次轮实验图像中铝、铜金属台阶灰度值曲线的分析求得X光的能量分别为49 keV和92 keV,这表明采用PIC数值模拟方法得到的X光能量更加符合实验结果。     

Modeling and identification on nonlinear saturable and reverse-saturable absorptions of gold nanorods using femtosecond Z-scan technique

An improved Z-scan analysis approach is proposed by establishing and solving the saturable absorption (SA) and reverse-SA (RSA) models, respectively. Near-infrared femtosecond Z-scans are carried out on the synthesized gold nanorods (NRs) possessing the average length of 46 nm using a femtosecond laser operated at the wavelength of 800 nm, which is close to the peak position of longitudinal surface plasmon resonance (SPR) (710 nm) of gold NRs. At lower input intensity of less than 400 GW/cm2 , the normalized transmission exhibits only SA phenomenon; however, when it exceeds 400 GW/cm2 , both SA and RSA are observed. By using the presented Z-scan modeling and theory, the three-photon absorption (3PA) is identified in the material, and the 3PA cross-section is determined to be 1.58×1071 cm6s2 .     

Synthesis and structure of novel phosphonodipeptides containing a uracil or thymine group

A series of novel phosphonodipeptides containing a uracil or thymine group was synthesized in 54.2–74.1% yields by means of a peptide coupling reaction with DCC as the dehydrating agent and 1‐hydroxybezotriazole as the activating agent of the carboxyl group. All products were characterized by ¹H NMR, ³¹P NMR and IR spectra, and by elemental analyses. The crystal and molecular structure of compound 6c has been determined by X‐ray diffraction. © 2000 John Wiley & Sons, Inc. Heteroatom Chem 11:422–427, 2000