Description: 在理论分析的基础上,着重采用Fox-Li数值迭代法计算了平平腔振荡模式的振幅分布和相位分布。计算结果表明,在经过300 次渡越后,归一化的振幅分布和相位分布实际上已不再发生变化,镜面中心处振幅最大，从中心到边缘振幅逐渐降落，镜面已不再是等相位面了。但对于菲涅尔数较大的平行平面腔，特别是在镜面中心及其附近，平面波是很好的近似，只有在镜的边缘处，波前才发生弯曲。则已找到光腔的一个自再现模式或横模分布。另一方面,分析了腔镜倾斜扰动对平平强腔内振荡模式的影响。数值计算表明,腔镜倾斜破坏了场分布的对称性,当引入的扰动量达到λ/ 36 时,振幅分布和相位分布发生严重的畸变。-Based on theoretical analysis, focusing on using Fox-Li iterative method to compute the average value of cavity oscillation modes of amplitude distribution and phase distribution. The results show that, after 300 crossover, the normalized amplitude distribution and phase distribution of virtually no change in the maximum amplitude of the mirror center, the amplitude gradually from the center to the edge of the landing phase of the mirror is no longer so noodles. But for the larger Fresnel number of parallel plane cavity, especially in the mirror center and near the plane wave is a good approximation, only the edge of the mirror, the wave just before the bend. Already found a cavity mode of representation or self-transverse mode distribution. On the other hand, analysis of the disturbance on the flat mirrors strongly inclined cavity oscillation modes. Numerical results show that destruction of the field distribution of tilted mirrors the symmetry, when the introduction of the disturbanc Platform: |
Size: 3072 |
Author:朱文睿 |
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Description: 设计背景:近年来现场可编程门阵列( FPGA) 技术得到了迅速的发展和广泛的应用, 其资源容量、工作频率以及集成度都得到了极大的提高, 使得利用FPGA 实现某些专用数字集成电路得到了大家的关注, 而基于FPGA 实现的直接数字频率合成器即DDS（Direct Digital Synthesizer）则更具其优点, 有着灵活的接口和控制方式、较短的转换时间、较宽的带宽、以及相位连续变化和频率分辨率较高等优点, 其也为设计者在此基础之上实现电路集成提供了另一种方法,同D/ A 转换器和低通滤波器( LPF) 一起便可以组成任意波形信号的发生器。-Design background: in recent years field programmable gates array (FPGA) technology obtained A rapid development and extensive application of its resource capacity, working frequency and integration have been greatly improved, make use of FPGA realizing some special Digital integrated circuit got everyone s attention, and based on FPGA realizing Direct Digital frequency Synthesizer namely Direct Digital Synthesizer (DDS) is more the advantages, has the flexible interface and the control mode, A relatively short period of time, A wide conversion bandwidth, and phase change and continuous frequency resolution higher advantages, its also to designers based on integrated circuit to realize provides an alternative method, with the D/A converter and low pass filter (together) and can form LPF of arbitrary wave form of signal generator. Platform: |
Size: 75776 |
Author:吴飞飞 |
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Description: 计算了基模高斯波束的电场，相位，该代码可用来计算光学中高斯波束的相关系数-Fundamental mode Gaussian beam calculated the electric field, phase, the optical code can be used to calculate the correlation coefficient in the Gaussian beam Platform: |
Size: 21504 |
Author:kaka |
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Description: 通过FOX-LI迭代法模拟激光谐振腔内自再现模的形成过程及达到稳定时的光场强度分布和相位分布。利用MATLAB编程实现了条形腔、矩形腔、圆形腔和倾斜腔的自再现模的计算机模拟-By FOX-LI iterative method analog laser cavity formation process of self-reproduction mold and achieve stable light field intensity distribution and phase distribution. The strip cavity using MATLAB programming, computer simulation of self-reproduction mode rectangular cavity, circular cavity and tilted cavity Platform: |
Size: 494592 |
Author:wangjian |
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Description: 本程序研究的目的是证明一种有限元相场算法，其中相场方程是完全耦合并同时求解的。不过，在这种情况下，完全耦合的方程是弹性和非守恒的阶参数；然而，该方法可作为其他相场模型完全耦合公式的模板。这是求解具有弹性不均匀性的Allen-Cohn方程的主要程序。有限元算法。该算法解决了非保守阶参数的演化问题。全耦合模式下应力列场的演化。取决于代码中Isolve参数的选择：对于Isolve-1，代码以长手格式和非优化模式执行。为了执行Matlab优化模式。因此，对于所需的执行模式，该参数应该在程序中修改。(The objective of this program is to demonstrate a FEM phase-field algorithm in which
phase-field equations are fully coupled and solved simultaneously. Although, in this case, the fully coupled equations are elasticity and non-conserved order parameters; however, the approach serves as a template for fully coupled formulism of other phase-field models. This is the main program to solve Allen-Cohn equation with elastic inhomogeneities using FEM algorithm. The algorithm solves the evolution of the non-conserved order parameters and the evolution of stress and strain fields simultaneously in fully coupled mode. Depending on the selection of the isolve parameter in the code: For isolve=1, the code executes in longhand format and un-optimized mode. For isolve=2, execution is for Matlab Octave optimized mode. Therefore, for the desired execution mode, this parameter in line 37 should be modified in the program.) Platform: |
Size: 99328 |
Author:2000码农 |
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