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天津市自然科学基金(07JCYBJC16600)

作品数:3 被引量:1H指数:1
相关作者:许京军张文定高峰张国权更多>>
相关机构:南开大学更多>>
发文基金:天津市自然科学基金国家自然科学基金国家重点基础研究发展计划更多>>
相关领域:理学机械工程更多>>

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Observation of modulated spontaneous emission of Rhodamine 6G in low refractive index contrast 1D-periodic gelatin film
2010年
The modulation of the spontaneous emission of Rhodamine 6G has been observed in one-dimensional periodic dielectric structure of dichromated gelatin film with refractive index contrast as low as 0.01. The spontaneous emission is enhanced at the band edges and inhibits in the band gap, which agree well with the theoretical analysis on the redistribution of the fractional local density of optical states.
LI Wei 1 , ZHANG XinZheng 1 , WANG ZhenHua 1 , WU Qiang 1 , LIU LongChang 1 , XU JingJun 1 & Tang BaiQuan 2 1 The MOE Key Laboratory of Weak-Light Nonlinear Photonics, TEDA Applied Physics School, Nankai University, Tianjin 300457, China
关键词:STATESCONTRASTSPONTANEOUS
Investigation on the phase shifts of extinction and phase gratings in polymethyl methacrylate
2010年
The phase shifts of the extinction and refractive index gratings to the illumination pattern are revealed in doped polymethyl methacrylate (PMMA). The dynamic process of these shifts is studied via two-wave coupling at 351 nm. It is shown that these shifts are from the strain and the shrinkage inside the sample and accompanied with the photo-repolymerization process during the building process of the holographic grating. Such shifts will cause obvious energy exchange between the two recording beams and enough attention should be paid to the nonlocal property of the holographic gratings of the material in the application.
李威唐柏权张心正高峰刘龙昌吴强潘雷霆楼慈波郭尚雨Romano A.Rupp许京军
红宝石中的弱光非线性与超光速传播被引量:1
2009年
总结了弱光作用下红宝石中存在的非线性性质及其在红宝石中群速调控应用中的贡献.可以简化成二能级系统的红宝石,在激光抽运下存在相干布居振荡效应;TEM00模的激光抽运下引起的自相位调制,又会在样品后表面引起相应的相位变化进而在远场产生夫朗和费衍射图形,这一衍射图形会随光强的时域调制而产生相应的变化;除此之外,这两种机制由于TEM00模的调制高斯光同时具备时间和空间的频率分量,不同空间频率分量之间还存在着类似于非简并二波耦合的效应.相干布居振荡、自相位调制及夫朗和费衍射以及非简并二波耦合这三种机制相互竞争,可以在红宝石中产生光群速的自加快的新结果,这种共存情况下的竞争机制可以给红宝石带来优良的弱光非线性性质.
高峰许京军张国权张文定
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