993 resultados para 124-771A
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208 p.
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玻璃是一种传统材料,通过利用外场对玻璃进行空间选择性的微结构调控,发挥微结构的协同效应、量子效应和干涉效应等,可以赋予玻璃高功能和全新性能。本文阐述了近年来发展迅速的飞秒激光与玻璃相互作用的特征,介绍了我们利用飞秒激光诱导折射率变化直写三维光波导、微光栅和光散射型光纤衰减器,进行活性离子(稀土、过渡和重金属离子)的价态操作及应用和发现的基于飞秒激光与玻璃非线性相互作用的偏振依赖的纳米光栅形成机制。
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The authors studied the circulation in the South Tropical Atlantic from hydrology and current measurements made during a cruise of the N.O. Capricorne in Nov 1971. Direct current measurements confirm the existence of the eastwards South Equatorial Counter-Current. The authors discuss the counter-current as confirmed by current measurements and high salinity core.
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There are two different effects to generate group delay dispersion by multilayer thin film mirrors: chirper effect and Gires-Tournois effect. Both effects are employed to introduce desired dispersion in the designed mirror. Thus the designed mirror provides large dispersion throughout broad waveband. Such mirror can be used for dispersion compensation in Ti:sapphire femtosecond lasers. Most group delay dispersion of a 5-mm Ti:sapphire crystal can be compensated perfectly with only four bounces of the designed mirror.
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A normal-incidence nonpolarizing guided-mode resonance filter is designed. There are two waveguide layers and one grating layer in the filter. By adjusting the distance between the two waveguide layers, the same resonance wavelength for both TE and TM polarization can be achieved. An antireflection design method is also used to decrease the sideband reflection of the filter. The results show that the filter has high reflection, more than 99.9% at 500 nm, and the FW-HMs of TE- and TM-polarized light are 2.16 and 0.15 nm, respectively. (C) 2009 Optical Society of America