About the cover: Advanced Photonics Volume 2, Issue 5

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Two different pulse cleaning techniques for ultra-high contrast laser systems are comparably analysed in this work. The first pulse cleaning technique is based on noncollinear femtosecond optical-parametric amplification (NOPA) and second-harmonic generat
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通过对不同浓度的Ti:Al2O3晶体紫外吸收光谱,可见偏振荧光光谱及其激发光谱的研究,发现峰值420 nm的宽带可见荧光,室温下较强的σ偏振光在低温(77 K)下变得比π偏振光弱。在液氮温度下π偏振光谱分裂成330 nm,420 nm,460 nm,560 nm等子荧光带。研究认为,这些发光带分别与色心(F ,F心)及Ti(4 )离子的电荷转移跃迁有关。并且室温下可见荧光具有的较强的浓度猝灭及现象来源于Ti(4 )离子的浓度猝灭及Ti(3 )离子的吸收增强两个因素。峰值于266 nm的吸收带是Ti(4 )