孔径光阑

研究结果表明：高斯反射率平凹腔和加孔径光阑七折叠稳定腔容易获得基模输出，可用于高功率横流CO2激光器以获得高功率高质量的激光光束。

It is shown that the Gaussian-reflectivity plano-concave resonator and the seven-folded resonator with circular diaphragms can easily output the fundamental-mode laser beams , respectively . Therefore , laser beams with high power and good quality can be obtained by using two resonators above .

为了要让整体系统获取最高能量利用率，本文把孔径光阑放置在前置变焦系统上，使其出瞳经后端系统成像在AOTF晶体中心处。

In order to obtain the highest energy utilization , we set the aperture stop on the front zoom system to image at the center of AOTF .

最后，利用求解全部本征值和本征向量的QR方法对共焦腔和带孔径光阑对称腔的横模场进行数值分析。

In the end , by use of the QR method , transverse mode fields in the circular confocal resonator and the symmetric resonator are numerically analyzed by solving the matrix for all eigenvectors and eigenvalues .

其次，利用激光光场空间追踪方法、角谱理论和快速傅里叶变换对Fox-Li迭代法进行改良，并给出带孔径光阑七折叠腔横模场的计算实例；

Second , based on the spatial tracing method , angular spectra theory and FFT , the Fox-Li iterative method is improved and the calculating instance for mode-fields in the seven-folded resonator with circular diaphragms is given ;

孔径光阑限制下高斯光束的传输

Propagation of Gaussian Beam Limited by an Aperture

对没有其他光阑的单透镜，透镜本身的边框就是孔径光阑。

To other simple lens without any apertures , the size of optical system is aperture .

得到的孔径光阑限制下高斯光束的传输规律为高斯光束在自由空间光通信和光学超分辨中的应用提供了理论基础。

These propagation rules of Gaussian beam limited by the aperture could promote the applications of Gaussian beam in the optical communication and the optical super resolution .

为了验证柯林斯公式的一种近似计算方法，对光波通过方形孔径光阑及一薄透镜时的衍射图像进行理论计算，并与实验结果进行比较。

Collins formula , which describes the diffraction of light wave passed through a near-axis optical system , and its inverse calculation expression are presented in this paper .

采用只与光路垂直的一片硅探测器，使其光敏面与孔径光阑几乎重合，以增大探测器的孔径角。

A piece of silicon detector vertical to light path is adopted , thus making its photo-sensitive surface nearly overlap with aperture stop and aperture angle of the detector can be enlarged .

孔径光阑可遮掉光束中偏离傍轴较多的光线，对像的清晰度、正确性、亮度和景深等有直接影响。

The aperture may curtain off the light beams that deviate paraxial , the object clarity , which has the immediate have an effect on the accuracy , brightness and the depth of field and so on .

另外，该方法可允许被测表面有小角度的倾斜，且不受测头与被测表面之间的孔径光阑的影响，是一种可用于在线光学测量的方法。

This method can allow the testing of a surface for a tiny angle in the testing process and is little affected by aperture between the sensor and the tested surface and it can be used in on line measurement .

提出充分利用像差渐晕改善像面照度均匀性的方法；论述标定轴外光束边界的逐次渐近过程和运用入瞳距离变量实现孔径光阑位置全域优化的技术。

In the end , it expounds the successive approach method to confirm the boundary of abaxial beams , and how to realize global optimization of the aperture stop ′ s position using the entrance pupil ′ s distance variable .

利用有限和矩阵方法对高斯反射率平凹腔、带孔径光阑七折叠腔的本征模场进行数值分析，并给出这两种腔场分布和损耗的计算结果。

By means of the finite-sum matrix method , eigenmode fields in the Gaussian-reflectivity plano-concave resonator and the seven-folded resonator with circular diaphragms are numerically investigated , and the numerical results of field distributions and losses in two high-power CO2 laser resonators are given .

光阑中心通常位于主光轴上，且光阑面与主光轴垂直？一般光学系统具有多个光阑，其中对光束的限制作用最大，即实际上决定通过光学系统的光束大小的那个光阑称为孔径光阑。

The aperture center usually is located in the main axis , and the aperture surface and the main axis perpendicular . Generally optical system has many apertures , the limit function is biggest to the light beam , namely in fact decided that is called the aperture .

在透射电子显微镜（TEM）电子衍射模式下，用适当孔径的物镜光阑选择非晶态SiO2的衍射区域，拍摄以溶胶-凝胶法制备的SiO2包覆纳米CaCO3的暗场像。

Applying the electron-diffractive mode of transmission electron microscope ( TEM ), an objective aperture with a proper diameter was used to select the diffractive area of non-crystal SiO_2 for taking the dark field images of SiO_2-cladding nano-CaCO_3 , produced by the sol-gel method .