窄带干涉滤光片抗击不同输出方式激光的损伤特性研究

利用Nd∶YAG调Q单脉冲激光和自由脉冲激光对硬膜窄带干涉滤光片进行激光损伤阈值的测试，并且采用表面热透镜技术测量了滤光片的吸收率。实验发现:窄带干涉滤光片的吸收率和激光损伤阈值强烈依赖于辐照激光波长与窄带干涉滤光片通带的相对位置；在调Q单脉冲激光作用下，不同中心波长的滤光片损伤形貌存在明显的差别，而在自由脉冲激光作用下，各滤光片的损伤形貌则趋于相同，均表现为典型的热熔烧蚀破坏。根据实验结果，结合损伤形貌，通过驻波场理论对激光作用下滤光片内电场分布的分析与模拟，探讨了两种激光模式作用下滤光片的损伤特征和损伤机理的不同特点。     

参数化滤波器逼近问题的棱柱算法

本文基于多胞形上D.C.函数的棱柱算法,给出了一维参数化小波滤波器逼近问题的一种算法.     

Laser-induced damage of 1064-nm narrow-band interference filters under different laser modes

The laser-induced damage behavior of narrow-band interference filters was investigated with a Nd:YAG laser at 1064 nm under single-pulse mode and free-running laser mode. The absorption measurement of such coatings has been performed by surface thermal lensing (STL) technique. The relationship between damage morphology and absorption under the two different laser modes was studied in detail. The explanation was given by the standing-wave distribution theory.     

Determination of optical constants in DUV/VUV

An approach for determining the optical constants of the weakly absorbing substrate is developed and applied to obtain the parameters of CaF2 and fused silica substrates in deep ultraviolet （DUV） and vacuum ultraviolet （VUV） range. A method for extracting the optical constants of thin films deposited on strongly absorbing substrate, which is based on the reflectance spectra measured at different angles of incidence, is also presented. The optical constants are determined by fitting the measured spectra to the theoretical models. The proposed method is applied to determine the refractive index and extinction coefficient （n, k） of MgF2 film deposited on silicon substrate by electron beam evaporation with substrate temperature 300 ℃ and deposition rate 0.2 nm/s. The determined n, k values at 193 nm are 1.433 and 9.1×10-4, respectively.     

辛酸蔗糖酯的超声合成、性能及应用

研究了超声技术促进蔗糖的酰化反应, 考察了反应温度、时间和催化剂等对反应的影响, 当蔗糖与辛酸乙酯的物质的量比为2∶1, 反应温度为70 ℃, 催化剂为(占辛酸乙酯质量分数)11%和反应压力为11 kPa的条件下, 超声反应2 h, 能高产率地获得辛酸蔗糖酯, 且产物的单酯化物含量达92%. 产物的结构经IR, 1H NMR和MS确证, 同时测定了产物的溶解性、亲水亲油平衡值(HLB)和热稳定性; 研究了辛酸蔗糖酯在织物的抗菌整理上的应用, 结果显示对金黄色葡萄球菌具有良好的抑菌效果(抑菌率为70%), 但对大肠杆菌无抑制作用.     

Damage on HfO_2/SiO_2 high-reflecting coatings under single and multiple Nd:YAG laser pulse irradiation

The single- and multi-shot damage behaviors of HfO2/SiO2 high-reflecting (HR) coatings under Nd:YAG laser exposure were investigated. Fundamental aspects of multi-shot laser damage, such as the instability due to pulse-to-pulse accumulation of absorption defect and structural defect effect, and the mechanism of laser induced defect generation, are considered. It was found in multi-shot damage, the main factors influencing laser-induced damage threshold (LIDT) are accumulation of irreversible changes of structural defects and thermal stress that induced by thermal density fluctuations.     

HfO2薄膜的结构对抗激光损伤阈值的影响

利用蒸发氧化铪和离子辅助蒸发金属铪反应沉积氧化铪薄膜，对两种工艺下制备的氧化铪薄膜进行光学和结构以及激光损伤特性的研究. 实验结果表明，用金属铪反应沉积的氧化铪薄膜不仅结构均匀，并且具有较高的激光损伤阈值. 文章对损伤阈值和薄膜的结构及光学特性之间的关系进行了讨论.     

一种新型锂离子电池聚合物电解质的光谱学研究

本文主要利用Raman光谱对由丙烯碳酸酯(PC)/聚丙烯腈(PAN)/双三氟甲基碘酸酰亚胺锂(LiTFSI)组成的锂离子电池聚合物电解质进行了研究,通过研究发现:Li+离子与PC的缔合和PC对TFSI-阴离子结构的影响导致了Li+-PC-TFSI-离子团的生成。而在所有的PC分子和盐发生缔合之前,PAN却不能溶到PC中。一旦PAN开始溶于PC,电解质内与PC相关的微观结构将不再随盐的浓度的增加而改变。但Li+离子与PAN之间的作用却显得异常激烈。     

Laser-induced damage of 1064-nm narrow-band interference filters under different laser modes

The laser-induced damage behavior of narrow-band interference filters was investigated with a Nd:YAG laser at 1064 nm under single-pulse mode and free-running laser mode.The absorption measurement of such coatings has been performed by surface thermal lensing(STL)technique.The relationship between damage morphology and absorption under the two different laser modes was studied in detail.The explanation was given by the standing-wave distribution theory.     

多孔硅镍钝化处理的光致发光谱研究

报道了对多孔硅在NiCl2中电解钝化处理的一种新方法,观测了经不同时间处理后多孔硅的光致发光谱,其光谱表明,恰当的处理条件,可使峰值强度增大约2．5倍,峰值波长蓝移33nm,分析了现象发生的原因是由于多孔硅表面的SiHx中的H被Ni替换成SiNix的结果。