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The record power conversion efficiency of small-area perovskite solar cells has impressively exceeded 25%。 For commercial application, a large-area device is the necessary next step。 Recently, significant progress has been achieved in fabricating efficient large-area perovskite solar cells。 In this review, we will summarize recent achievements in large-area perovskite solar cel

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We report on a high-power Ho:YAG single-crystal fiber (SCF) laser inband pumped by a high-brightness Tm-fiber laser at 1908 nm。 The Ho:YAG SCF grown by the micro-pulling-down technique exhibits a propagation loss of $0。05\pm 0。005~\text{cm}^{-1}$ at $2。09~\unicode[STIX]{x03BC}\text{m}$。 A continuous-wave output power of 35。2 W is achieved with a slope efficiency of 42。7%, which

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We present a study of laser-driven ion acceleration with micrometre and sub-micrometre thick targets, which focuses on the enhancement of the maximum proton energy and the total number of accelerated particles at the PHELIX facility. Using laser pulses with a nanosecond temporal contrast of up to $10^{-12}$ and an intensity of the order of $10^{20}~\text{W}/\text{cm}^{2}$, prot

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All-optical modulation based on the photothermal effect of two-dimensional (2D) materials shows great promise for all-optical signal processing and communication. In this work, an all-optical modulator with a 2D PtSe2-on-silicon structure based on a microring resonator is proposed and demonstrated utilizing the photothermal effect of PtSe2. A tuning efficiency of 0.0040 nm 

PDF全文 HTML全文 Photonics Research | 2020,8(07):1189-1196
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Optical frequency combs, a revolutionary light source characterized by discrete and equally spaced frequencies, are usually regarded as a cornerstone for advanced frequency metrology, precision spectroscopy, high-speed communication, distance ranging, molecule detection, and many others。 Due to the rapid development of micro/nanofabrication technology, breakthroughs in the qual

PDF全文 HTML全文 Advanced Photonics | 2020,2(03):034001-34001
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利用旋涂法制备了两种PMMA-偶氮化合物主客体掺杂型薄膜, 并对其进行全光极化, 采用紫外-可见吸收谱和二次谐波产生的方法研究了薄膜的二阶非线性光学特性。实验结果表明,4′-Nitro-4-dimethylaminoazobenzene的二阶非线性光学系数d33=6.89×10-1 pm/V, 4′-Iodo-4-dimethylaminoazobenzene的d33=7.77×10-2 pm/V; 这两种薄膜在全光极化过程中二次谐波产生(SHG)强度随膜厚的变化规律以及极化饱和后的

PDF全文 光学学报 | 2009,29(01):m00006
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目前, 多摄像机系统的位姿估计还缺乏系统的方法, 它通常通过求解透视n点问题或者求解使两组3D点集之间平方和误差最小的刚体变换来解决, 这些方法都有局限性。正交迭代算法是基于点特征的单目视觉算法, 快速且全局收敛, 是目前性能最优的实时位姿估计算法之一, 被广泛应用。提出了一种广义正交迭代算法把所有摄像机获取的全部图像作为整体计算得到相对位姿参数, 是通用的多目视觉位姿估计算法。算法先把所有摄

PDF全文 光学学报 | 2009,29(01):m00006
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基于非线性偏振旋转锁模原理、非线性薛定谔方程和色散波干涉理论, 建立了被动锁模光纤激光器的光谱分析模型。采用此模型进行数值仿真, 研究了腔体长度、增益光纤长度和耦合输出比对光谱边带的影响。并分别采用13 m、16 m和26 m的腔长, 0。5 m, 1。5 m和3 m的掺铒光纤以及不同的耦合输出比进行了实验, 对比了上述情况下激光器的输出光谱。实验与仿真结果表明, 要抑制光谱边带, 应尽量缩短腔长, 适当增加增益光纤

PDF全文 光学学报 | 2009,29(04):m00006
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利用各向异性扩散和核方法, 提出了一种新的核各向异性扩散去噪算法, 应用于跨座式单轨轨道梁面线性裂纹的去噪取得了较好效果。在各向异性扩散的基础上, 增加一个边缘增强算子, 用于增强微弱的裂纹边缘信息, 并且根据噪声均匀分布在多维空间的特点, 把低维数据推广到高维空间, 结合核方法的优点, 在核空间中实现去噪, 同时采用平均绝对差值的自动扩散终止规则也提高了核各向异性扩散的效率。选用不同的边缘增强

PDF全文 光学学报 | 2009,29(04):m00006
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采用金属有机化学气相淀积(MOCVD)法在InP衬底上低温生长6个周期的InGaAsP多量子阱薄膜, 薄膜对1.06 μm激光的小信号透过率为23%。该薄膜兼作Nd∶YAG激光器的可饱和吸收体及耦合输出镜, 实现1.064 μm激光的被动锁模运转, 获得平均脉宽23 ps, 能量15 mJ的单脉冲序列。采用射频磁控溅射法在石英衬底上制备4个周期的Si/SiNx多量子阱薄膜, 样品在氮气环境下以1000 ℃退火30 min后, 插入Nd∶YAG激光器腔内, 实现1.0

PDF全文 光学学报 | 2009,29(06):m00006
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