【摘 要】
：
An all-reflective self-referenced spectral interferometry based on the transient grating (TG) effect is proposed for single-shot measuring of the amplitude and phase of ultrashort pulses in a broadband spectral range. Except for a thin third-order nonline
【机 构】
：
DepartmentofPhysics,ShanghaiUniversity,Shanghai200444,ChinaStateKeyLaboratoryofHighFieldLaserPhysics
【出 处】
：
ChineseOpticsLetters
论文部分内容阅读
An all-reflective self-referenced spectral interferometry based on the transient grating (TG) effect is proposed for single-shot measuring of the amplitude and phase of ultrashort pulses in a broadband spectral range. Except for a thin third-order nonlinear medium, which was used to generate the TG signal, no transmitted optics were used in the proposed device, and few-cycle pulses in a broad spectral range from deep UV to mid-IR can be characterized. With a homemade compact and alignment-free device, a 5.0 fs pulse at 800 nm corresponding to about two cycles and a 14.3 fs pulse at 1800 nm corresponding to less than three cycles were successfully characterized.
其他文献
In this paper, we present a three-parametric model using Raman and fluorescence spectroscopy for detection and analysis of esophagus dysphasia and esophagus cancer. The model was set up from more than 1000 samples. And 56 samples were used to test this al
膨胀率测量广泛使用的方法要使用推棒和线性差动变压器，这种方法测量精度中等，不是绝对测量，需要定标。
A numerical model is presented to predict the time-resolved evolution of the spatial intensity distribution of the laser pulses in the super-Gaussian mirror resonator, taking into account diffraction and stored energy depletion. The beam-quality factor M2
提出了一种消除雾气对车载摄录设备光学成像影响的系统,改善了车载设备获取图像的视觉效果,优化了后续对图像中信息的提取与应用。设计的双模式雾气消散系统包括硬件和软件两部分,硬件为基于物理热消散效应的机械去雾结构,软件为基于大气散射模型估算的图像处理算法。能在不同湿度下保证车载摄录图像的清晰度和细节特征,具有实时处理和自适应反馈等优势,满足商业化应用需求。
本文给出横流放电CO2激光器中饱和增益系数的二维分布及其随辐射场的变化规律,用微观物理机制作了注释。用三种稳定振荡条件分别计算腔中的光强分布和输出功率,并予以评比,提供一种选择器件最佳设计方案的简便方法。
采用连续光纤激光器在小模数齿轮齿面制备1 mm厚的Ni60合金涂层,针对小模数齿顶较薄以及单道激光在齿轮中部能量过于集中易造成熔覆缺陷的原因进行分析,提出了采用双道激光在小模数齿面制备镍基合金涂层的方法,在保证激光总输入能量不变的条件下,将原有单束激光的能量按一定的能量配比方案分配到两个小光斑上,依次加工齿轮的齿顶和齿底。结果表明:采用双道1 mm 光斑按4∶6能量配比方案不仅减小了齿顶的烧蚀,还解决了齿轮中部能量过于集中的问题,涂层的稀释率显著降低,组织中含Fe、Ni的晶状奥氏体析出较少,富含Cr的粒状
Influence of interface roughness on the reflectivity of Tungsten/boron-carbide (W/B4C) multilayers varying with bi-layer number, N, is investigated. For W/B4C multilayers with the same design period thickness of 2.5 nm, a real-structure model is used to c
多孔径扫描波面恢复技术是一项新的高精度大孔径面形检测手段.本文从建立波面恢复精度的评价标准出发,结合实测结果进行讨论,并对影响精度的两个重要因素即拼接模式及拼接区大小进行分析.