展宽器元件失调及带通分析

通过光线追迹法给设计的反射式单光栅展宽器建立了一个数学计算模型。利用这个数学模型计算和分析了元件失调对反射式单光栅展宽器二阶色散量和输出光束发散角的影响，并考虑了反射式单光栅展宽器中衍射光栅和球形凹面镜的尺寸与展宽器带通的关系。发现当平面反射镜M1的纵向偏离角为0．2°时．展宽器的二阶色散量最大，偏离角大于或小于0．2°时，展宽器的二阶色散量随之减小；得到了元件失调会增加输出光束发散角的结论；并发现展宽器中衍射光栅和球形凹面镜尺寸的有限大小对带通有限制作用。提出了利用反射镜M1纵向的适当偏离增大展宽器二阶

基于光纤环形镜的全光脉冲整形器

提出了一种基于光纤环形镜的全光脉冲整形器。该全光脉冲整形器利用波分复用器将控制光脉冲引入光纤环形镜中，控制光脉冲由于交叉相位调制在信号光上产生了非线性附加相移。信号光在耦合器中发生干涉，经过整形的信号光脉冲从脉冲整形器的出射端出射，信号脉冲的波形由非线性附加相移的波形决定。实验中．利用对控制脉冲光谱整形和啁啾展宽的方法来对控制脉冲进行时间脉冲的整形，该全光脉冲整形器实现了对单纵模激光的脉冲整形，同时实现了飞秒脉冲和单纵模整形脉冲的精确同步。在理论上数值计算了该全光脉冲整形器的输出特性，理论计算结果和实验结

环形抛光中工件形状对抛光速度的影响

本文基于库仑摩擦模型，模拟了不同形状的工件在环形抛光的运动。从结果可知，（1）如果工作环处于自由转动状态，工件的角速度在环形抛光中比抛光盘的角速度大；（2）可通过控制工作环的角速度使工件和抛光盘的角速度同步。工作环的角速度依赖于工作环和工件的半径、抛光盘－工件和抛光盘－工作环的摩擦系数，以及抛光盘的角速度；（3）有尖角的工件与工作环的接触处于不连续状态，导致二者的接触状态发生变化和工件角速度的波动。

Offner展宽器曲面镜误差对输出脉冲对比度的影响

在ffner展宽器的设计研究中,对曲面镜曲率半径的误差研究非常重要,它直接影响输出脉冲的质量。因此有必要分析ffner展宽器中曲面镜曲率半径的误差对输出脉冲对比度的影响。参考ffner展宽器的光线追迹模型,建立了ffner展宽器中曲面镜曲率半径存在误差时的光线追迹模型;根据建立的模型,详细分析了曲面镜曲率半径的误差对输出脉冲质量的影响;发现在目前曲面镜曲率半径的加工误差在0.2%~0.5%的情况下,完全可以满足神光II拍瓦激光装置中对展宽器的要求;同时发现如果曲面镜曲率半径存在误差时,应该尽量使两曲面镜之间的距离保持为凹面反射镜曲率半径的一半,而不是使两曲面镜保持同心。

Yb:YAG/YAG复合陶瓷薄片连续和调Q输出特性

采用面泵浦的CAMIL结构，我们研究了970 nm泵浦的Yb:YAG/YAG复合陶瓷薄片激光器，获得了连续和调Q的激光输出。在连续运转情况下，获得了最高1.05 W的激光输出，中心波长为1031 nm，后腔输出镜透射率为2％。我们同时获得了声光调Q的脉冲输出，重复频率从1 kHz到30 kHz，脉宽分别从166 ns到700 ns。

The body social: an enactive approach to the self

This paper takes a new look at an old question: what is the human self? It offers a proposal for theorizing the self from an enactive perspective as an autonomous system that is constituted through interpersonal relations. It addresses a prevalent issue in the philosophy of cognitive science: the body-social problem. Embodied and social approaches to cognitive identity are in mutual tension. On the one hand, embodied cognitive science risks a new form of methodological individualism, implying a dichotomy not between the outside world of objects and the brain-bound individual but rather between body-bound individuals and the outside social world. On the other hand, approaches that emphasize the constitutive relevance of social interaction processes for cognitive identity run the risk of losing the individual in the interaction dynamics and of downplaying the role of embodiment. This paper adopts a middle way and outlines an enactive approach to individuation that is neither individualistic nor disembodied but integrates both approaches. Elaborating on Jonas' notion of needful freedom it outlines an enactive proposal to understanding the self as co-generated in interactions and relations with others. I argue that the human self is a social existence that is organized in terms of a back and forth between social distinction and participation processes. On this view, the body, rather than being identical with the social self, becomes its mediator

机载测深激光雷达千赫兹全固态激光器设计及特性研究

将千赫兹高功率全固态Nd：YAG激光器的增益介质当作厚透镜处理，使用矩阵的方法对等效热透镜腔进行分析。采用多条半导体激光列阵侧向紧凑抽运结构设计，提高了增益介质光抽运的均匀性。根据实际抽运功率，通过模拟计算，设计了平凸非稳腔。选择的凸面全反镜的最佳曲率半径有效地补偿了增益介质热透镜效应，激光器实现了动态稳腔运转，激光脉冲能量输出斜度效率大于13％，光束发散角优于1.3mrad。

Silenced angels: an obscure Saint Theresa in George Eliots Middlemarch

A presente dissertação objetiva a comparação proposta no Prelúdio do romance Middlemarch por sua autora George Eliot entre a protagonista da obra, Dorothea Brooke, e a figura histórica Teresa dÁvila. A partir de tal estudo, busca-se compreender de que modo a situação específica da mulher na Era Vitoriana é articulada no romance de modo a espelhar a crise ontológica e epistemológica do próprio ser humano diante das transformações consolidadas com o Iluminismo e as revoluções liberais do século XVIII que culminariam na morte de Deus. Dorothea mostra-se uma cristã tão fervorosa quanto a Teresa quinhentista, mas faltam-lhe certezas e a resolução para concretizar as reformas sociais que defende, pois ela encarna o mito de feminilidade oitocentista batizado de Anjo do Lar ideal de sujeição feminina à ordem falocêntrica cujas funções são a proteção e difusão da moralidade burguesa e a substituição de elementos cristãos no universo do sagrado a uma sociedade cada vez mais materialista e insegura de valores absolutos. As aflições de Dorothea representam as aflições da mulher vitoriana, mas o momento crítico desta mulher reflete, em Middlemarch, uma crise muito maior do Ocidente, que teve início com a Era da Razão

输出高重复频率脉冲列的全固态激光器

报道了利用声光振幅调制锁模的方法，在激光二极管端面抽运Nd：YVO4激光器上获得320MHz高重复频率脉冲列的实验结果。实验采用平一平腔结构，腔长452mm，耦合输出镜透过率为3．6％。所用声光介质为熔融石英晶体，以铌酸锂作换能器，在驱动功率4．5W时，对1064nm波长衍射效率为50，相应的调制深度为0．31。在最佳锁模状态下，激光二极管抽运功率为3．5W，此时激光平均输出功率为15mw。示波器记录脉冲宽度680ps，实测光束质量因子M^2小于1．5。并在实验基础上对激光器工作的稳定性进行了分析，结果表

部分端面抽运板条激光器腔镜倾斜问题研究

部分端面抽运的板条激光器是一种新型固体激光器．配合混合腔可以实现在大功率下保持高光束质量的激光振荡输出。谐振腔的腔镜倾斜是影响激光器输出特性的重要因素，快速傅里叶方法是一种快捷有效的计算方法，利用此方法模拟了腔镜倾斜对近场相位分布和远场光强分布的影响，并分析了光束质量的变化。理论分析表明，腔镜的小角度倾斜对近场相位影响较大，但对远场光强空间分布影响不大；随着倾斜角度不断增大，远场发散角和光束腰宽度也增大，光束质量虽然存在恶化的趋势，但光束质量因子肝值仍然较小，离轴非稳腔仍能保持高光束质量的输出。

位相锁定来自同一侧面抽运Nd：YAG板条的两束激光

实验研究了腔内位相锁定来至一LAD侧面抽运的Nd：YAG板条的两束激光，输出镜面出现干涉条纹，获得1.13W的相干光，其组束效率达到64.9%，相干度约60%。实验中发现只需要一根作为滤波的金属丝放在离输出镜合适的位置都就能有效稳定干涉条纹，金属丝引起的损耗低于8%。

Yb：Y2O3透明陶瓷的光学性能研究

介绍了一种基于纳米粉末真空烧结技术的新型固体激光材料——Yb：Y2O3多晶陶瓷的制备工艺、物理化学特性、能级结构和光谱特性，并与Yb：YAG单晶进行了对比．采用紧凑型有源镜激光器（CAMIL）的抽运方式，验证了Yb：Y2O3透明陶瓷的激光输出性能．在35W的最大抽运功率下，得到波长1078nm，功率10．5w的连续激光输出，斜率效率达到37．5％．实验中还观察到激光输出波长随抽运功率增加而红移以及随输出耦合镜变化而漂移的现象．Yb：Y2O3多晶陶瓷是一种理想的激光材料，不仅具有与Yb：YAG单晶同样优秀的

边缘泵浦被动调Q的Nd：YAG薄片激光器

文中报道了一台采用激光二极管部分边缘泵浦方式的高功率薄片激光器，晶体尺寸是1 mm×10 mm×60 mm。Cr4+：YAG被用来作为被动调Q晶体，在重复频率高于10kHz时，获得了脉宽10ns，平均功率70W，斜线效率为36\%的激光输出。通过控制泵浦光束直径的大小，我们在厚度方向得到了近似衍射极限的光束输出。整个激光器结构紧凑，大小为60 mm×174 mm×150 mm。

2W Yb-doped double-clad fiber superfluorescent source with 42 nm 3 dB bandwidth

The output spectrum of Yb-doped double-clad fiber superfluorescent source (SFS) is tailored by placing a broadband dichroic mirror in the pump end of conventional single-pass forward configuration, which constitutes double-pass forward configuration. The 3 dB bandwidth is increased from I I to 42 nm. A maximum output SFS power of 2.12 W and a slope efficiency of 43.2% are obtained. The double-clad fiber is 25 in and the pump power is adequate to saturate the fiber as far as the feedback-induced lasing appears. (c) 2004 Elsevier Ltd. All rights reserved.

瓦级双包层光纤超荧光光源的实验研究

采用大功率半导体激光器抽运25m掺Yb双包层光纤，在单程装置中，前向(SPF)和后向(SPB)分别获得了1．46w和1．82w最大超荧光功率，斜度效率分别为23．4％0和29．2％，3dB带宽最大为11nm。采用特定范围波长双色镜作为前腔镜，形成双程前向(DPF)装置，获得最大超荧光输出功率2．12W，此时斜度效率为43．2％，中心波长在1070nm，输出光谱平坦性较好，3dB带宽从单程的11nm提高到42nm。