【摘 要】
：
Optic parameters, such as the probabilities of radiative and non-radiative transition and the crossrelaxation probability between Yb3 and Ho3 ions in Yb,Ho:YAG crystal, are calculated on the basis of Judd-Ofelt and Dexter theories. The energy up-convers
【机 构】
：
OptoelectronicDivision,ChinaInstituteofMetrology,Hangzhou310034,DepartmentofOpticalEngineering,Zheji
【出 处】
：
ChineseOpticsLetters
论文部分内容阅读
Optic parameters, such as the probabilities of radiative and non-radiative transition and the crossrelaxation probability between Yb3 and Ho3 ions in Yb,Ho:YAG crystal, are calculated on the basis of Judd-Ofelt and Dexter theories. The energy up-conversion process is analyzed by solving the transition rate-equations. The results show that (1) the intensity of the green fluorescence relates to the square of the concentration of the active ions; (2) the intensity increases with the concentration of sensitive ions as well, but the increasing rate goes rather too slow; (3) the efficiency of the energy up-conversion relates with the speed of the energy up-conversion and the quantum efficiency of the transiting from upper levelto lower level.
其他文献
A photon sieve can be composed of a large number of circular pinholes. Each circular pinhole has a contribution to the focusing. For the case of point-to-point imaging, the focusing contribution of an individual circular pinhole can be analytically given.
激光衍射对刀是通过检测两个一级衍射条纹峰值点的间距来进行对刀间隙测量的一种方法。测量过程中众多工艺参数的调整会对测量结果的精度产生重要影响。由于CCD装夹误差的存在, CCD像面实际安装位置相对于系统理想光轴法平面不可避免地会发生倾斜, 倾斜量的存在会导致检测结果不准确。为了研究CCD倾斜角度对衍射对刀精度的影响, 建立了含有CCD倾斜角度的激光衍射光强模型和一级次极大峰值点间距误差计算模型, 并提出了基于一级次极大峰值点间距的角度校正方法。通过实验确定了CCD像面最佳倾斜角度的工艺调整范围, 为有效提高
We propose a joint nonlinear electrical equalization approach in coherent optical discrete-Fourier-transform spread orthogonal-frequency-division-multiplexing (DFT-spread-OFDM) systems with polarization division multiplexing (PDM). This method is based on
本文首次报导关于强光脉冲在多模纤维光波导中的空间-时间演化实验研究。特别有趣的是发现了辐射的自感应通道作用，因为文献[1]中所预示的自聚焦概念排除了脉冲自通道作用的可能性。
贝塞尔晶格是在自聚焦光折变晶体中通过光诱导产生的，研究了涡旋光束在贝塞尔晶格中的传输特性。通过数值仿真发现改变参数的值，即改变晶格上外加电场强度的大小、贝塞尔晶格的横向尺度系数以及晶格深度，会出现完全不同的传输结果。这些结果表明：由于晶格的存在，输入的环状涡旋光束可以克服自身因聚焦非线性而引起的方位角调制不稳定性；当条件适当时，涡旋光束可以形成环状涡旋孤子并稳定地传输很长距离；当输入光束的能量并不是完全落在贝塞尔晶格的环状信道中时，在传输过程中光束可能演变成为一个大环环绕一个小环的双环结构。
提出将百分位半阈值匹配追踪法(PHTPA)应用于生物发光断层成像(BLT)这一光学分子成像模态领域。将BLT光源重建为一个L1/2范数正则化问题,在迭代半阈值算法(HTA)的基础上,结合子空间跟踪和百分位阈值法对其求解。在数字鼠模型上设计多组仿真实验,对改进的半阈值算法进行有效性和收敛性的评估。仿真结果表明,与原有的HTA和迭代重赋权算法相比,PHTPA在不同光源设置下都能得到更为准确的重建结果。
Experiments for the laser guiding have been carried out with the 30-fs, 100-TW Ti:sapphier laser pulse interaction with a long slab (1.2*10 (mm)) and discharged capillary of underdense plasma. Formation of an extremely long plasma channel with its length
本文报导了在光克尔快门中强绿光自开门现象,初步分析了自感应退偏振的成因。
In this Letter, we demonstrate high-quality (Q), millimeter-size, and V-shaped calcium fluoride crystalline resonators for modal modification. To manufacture such resonators, we develop a home-made machining system and explore a detailed process. W