Electron Beam Lithographic Pixelated Micropolarizer Array for Real-Time Phase Measurement

Pixelated micropolarizer arrays （PMAs） have recently been used as key components to achieve real-time phase measurement. PMA fabrication by electron beam lithography and inductively coupled plasma-reactive ion etching is proposed in this work. A 320 × 240 aluminum PMA with 7.4 μm pitch is successfully fabricated by the proposed technique. The period of the grating is 140nm, and the polarization directions of each of the 2 × 2 units are 0°, 45°, 90°, and 135°. The scanning electron microscopy and optical microscopy results show that the PMA has a good surface characteristic and polarization performances. When the PMA is applied to phase-shifting interferometry, four fringe patterns of different polarization directions are obtained from only one single frame image, and then the object wave phase is calculated in real time.     

Passive mode locking of an Yb:YAB laser with a low modulation depth SESAM

A passive mode-locked diode-pumped self-frequency-doubling Yb:YAB laser with a low modulation depth semiconductor saturable absorber mirror operating at 374 MHz is demonstrated.The measured pulse duration is 1.98 ps at the wavelength of 1044 nm.The maximum average power reaches 45 mW.     

飞秒激光在光子晶体光纤中产生超连续光谱机制的实验研究

报道了利用零色散在780nm处的光子晶体光纤与纳焦耳量级的飞秒激光脉冲相互作用的实验结果.实验使用35fs，中心波长810—840nm，单脉冲能量可达14nJ的飞秒激光光源获得了超过一个倍频程的平坦超连续光谱（500—1100nm）.在不同功率、不同中心波长、不同啁啾和有无直流成分的多种飞秒脉冲激光的条件下，研究了超连续光谱的产生情况.并对一系列现象进行了对比，分析了超连续光谱产生的机制. 关键词： 光子晶体光纤 飞秒脉冲激光 超连续光谱     

Diode-pumped 1123-nm Nd:YAG laser

We demonstrated a diode-pumped Nd:YAG laser with a plano-concave resonator. When the pump power is 1.57 W, the output power of 1123-nm laser is 132 mW at the temperature of 20 ℃, and the power change is less than 2% in an hour. A periodically poled LiNbO3 (PPLN) was used as outer cavity frequency-doubling crystal and 561-nm laser was observed.     

矩阵投影算法用于校正ICP—AES中的光谱干扰

本文将矩阵投影算法应用于ＩＣＰ－ＡＥＳ中光谱干扰的校正，在有关文献方法基础上，对残差作了进一步的校正，并采用最优化技术确定背景光谱的最优解，因而提高了方法的准确度。对实际干扰体系的校正结果表明，本方法能够对ＩＣＰ－ＡＥＳ中比较复杂的结构背景以及谱线重叠干扰进行较为准确地校正。     

5.3-W Nd:YVO_4 passively mode-locked laser by a novel semiconductor saturable absorber mirror

We report a diode end-pumped continuous wave (CW) passively mode-locked Nd:YVO4 laser with a homemade semiconductor saturable absorber mirror (SESAM). The maximum average output power is 5.3 W at the incident pump power of 17 W, which corresponds to an optical-optical conversion efficiency of 31.2% and slope efficiency of 34.7%. The corresponding optical spectrum has a 0.2-nm full width at half maximum (FWHM). and the pulse repetition rate is 83 MHz.     

17-次乙二氧基-3-甲氧基-雌甾-2,5(10)-二烯-11β-醇用硅胶支持的草酸试剂选择性水解

以3-甲氧基一雌甾-1,3,5(10)-三烯衍生物,经Birch还原所得的3-甲氧基-雌甾-2,5(10)-二烯,是合成各种19-去甲甾体药物的重要前体,在甾体有机合成中有重要意义。在强酸条件下,水解3-甲基烯醇醚,将发生5(10)-双键移位,得到相应的共轭4-烯-3-酮化合物,同时,分子中的其他对酸敏感的基团会     

新型水溶性聚[(3-辛酰基吡咯-2,5-二)对二甲氨基苯甲烯]的合成、表征及性能研究

合成一种新型含推-拉电子基团的大π共轭高分子聚[(3-辛酰基吡咯-2,5-二)对二甲氨基苯甲烯](POPDMABE).用氢核磁共振谱、傅里叶红外光谱、紫外-可见光谱等分析手段对聚合物POPDMABE进行了结构表征.该聚合物易溶于多种极性有机溶剂和酸性水溶液,易于加工.热重分析表明,POPDMABE可耐180℃的高温.通过X射线衍射和透射电镜研究表明,POPDMABE以晶态和无定形态共存.光致发光光谱表明,在360nm的紫外光激发下,POPDMABE能发出蓝色荧光.     

半导体可饱和吸收镜启动克尔透镜锁模机理的实验研究

对采用腔内新型宽带半导体可饱和吸收镜(SESAM)掺钛蓝宝石激光器中的启动克尔透镜锁摸(KLM)的机理进行了实验研究.讨论了SESAM在阻挡恢复过程中,启动锁模时间与其他因素的关系.获得了SESAM启动KLM过程较为完整的物理图像,并对其机理进行了分析和讨论.     

半导体可饱和吸收镜启动的高功率飞秒掺钛蓝宝石激光器

半导体可饱和吸收镜（SESAM）启动的高功率飞秒掺钛蓝宝石激光器,在Ar^ 激光器10W全线抽运下,其平均输出功率达到1.7W,脉冲宽度小于16fs,斜率效率为22％。文中对半导体可饱和吸收镜自启动的动力学过程进行了实验研究。这种自启动、高功率、窄脉宽的飞秒激光器将具广泛的应用前景。