Compact Single-Stage Femtosecond Multipass Ti：Sapphire Amplifier at 1 kHz with High Beam Quality

A compact femtosecond Ti：sapphire amplifier system is reported using single-stage multipass configuration with high beam quality. A high dispersion glass stretcher and a pair of double prisms for compression are introduced based on broadband femtosecond seed pulses. The non-grating-based pulse stretcher and compressor are advantageous to increase high beam quality and to reduce the high-order dispersion. A Gaussian filter is used to reduce the gain narrowing effect in amplification. The compact femtosecond Ti：sapphire nine-pass amplifier delivers pulses with a duration of 26 fs and an energy of 800μJ at 7mJ pumping pulses energy at I kHz. The 1-kHz femtosecond amplifier with high beam quality and high stability is very suitable for ultrafast physics research applications, such as attosecond science, ultra-precision micromachining, and THz wave generation.     

甲基百里(香)酚蓝新负载树脂的特 性及应用

本文以金属指示剂甲基百里(香)酚蓝作为鳌合剂制得具有相应鳌合基团的负载树脂.研究了该树脂的某些分析特性及其在富集天然水中微量铜、钻、镍、锌中的应用.     

Fabrication and Characterization of Ni Thin Films Using Direct-Current Magnetron Sputtering

Ni films are deposited by using ultra high vacuum dc magnetron sputtering onto silicon substrates at room temperature, and the high-quality and high-density films are prepared. The parameters, such as thickness, density and surface roughness, are obtained by using small-angle x-ray diffraction (XRD) analyses with the Marquardt gradient-expansion algorithm. The deposition rate is calculated and the Ni single layer can be fabricated precisely. Based on the fitting results, we can find that the surface roughness of the Ni films is about 0.7nm, the densities of Ni films are around 97% and the deposition rate is 0.26nm/s. The roughness of the surface is also characterized by using an atomic force microscope (AFM). The changing trend of the surface roughness in the simulation of XRD is in good agreement with the AFM measurement.     

等温平台石墨炉原子吸收光谱法测定高纯镍中痕量杂质锑

利用石墨炉原子吸收法，在等温平台条件下直接测定高纯镍中的痕量杂质锑，对石墨炉加热程序中的干燥时间、灰化温度及原子化温度进行了优化，同时考察了介质酸度的影响。试验表明，基体镍对锑的测定有显著的影响，为此进行了标准系列基体匹配。该法的特征质量为6．6pg；相对标准偏差为6．5％；加标回收率为100％-103％。     

非晶态镍钨合金电镀工艺

非晶态镍钨合金由于具有长程无序，短程有序，无晶界、无位错，而具有极为优异的化学、物理和机械性能。非晶态镍钨合金镀层的结构致密，硬度高，耐热性好，尤其在高温下耐磨损、抗氧化，更能显示出其优良的自润滑和耐蚀性能。     

百太瓦级超短超强钛宝石激光装置研制

近年来，随着相关领域的发展,尤其是啁啾脉冲放大（Chirped Pulse Amplification．CPA）技术的出现，使得超短脉冲激光的峰值功率的进一步提高，输出功率已能达到百TW或PW以上，聚焦功率密度可达到10^2W／cm^2.CPA技术的基本思路是将非常窄的种子光脉冲在时域上展宽，然后在放大器中充分的提取能量，最后将激光脉冲压缩到接近初始的脉冲宽度．从而获得极高的峰值功率，如图1所示如此超高强度的激光脉冲，可以创造极端的物态条件，用于研究相对论领域的光与物质相互作用，如超快x光激光产生、超高次谐波产生、激光尾波场粒子加速、实验室天体物理学及快点火机制等。随着超短超强脉冲激光装置性能的提高和研究工作的进一步深入，超短超强脉冲激光将会在军事、科技和民用方面呈现广阔的应用前景。