光像

This problem is also important and valuable in Nonlinear Optics. It will be very helpful to understand how the aberrations affect the course of three- wave mixing, such as the change of conversion efficiency, the distribution of intensity and phase.Small signal solution of aberrated second harmonic generation is deduced from three-dimension three wave coupling functions. The numerical work gives out lot of results of different aberrations. The effects of the fundamental waves aberrations, which will change the conversion efficiency, distribution of intensity and phase in the frequency conversion, is analyzed. It shows that when walk-off and diffraction effects could be ignored approximately estimation of the phase distribution of second-harmonic wave could be done. The far field divergent angle and second moment radius of harmonic wave will vary with the aberration of fundamental wave, but the far field divergent angle will be obviously smaller than that of fundamental wave. The phase distribution of both fundamental and harmonic wave is measured using Hartmann-Shack wave front sensor in the experiment with 1064nm and 790nm lasers, respectively. Results are given.

首次从三维三波相互作用方程组推导得到了位相畸变光束倍频的小信号解；通过建立国防科学技术人学研究生院学位论文三维数值模型，编写相应仿真程序，首次得到了位相畸变光束倍频过程的大量计算结果，深入细致地研究了位相畸变光束经非线性光学频率变换后谐波的转换效率、光强分布、位相分布以及影响它们的各种因素；得出谐波的远场发散角和光斑二阶矩的变化规律会因为基波像差的不同而不同，但谐波的远场发散角明显地比相应基波的小的结论；得到了在走离效应和衍射效应等影响许多因素可以忽略的情况下，位相畸变传递到二次谐波的估算式；举例分析了KDP三倍频方案中，基波位相畸变对二次谐波和三次谐波的影响；实验工作中，用哈特曼一夏克传感器分别对IO64nm倍频过程和790飞秒超短脉冲倍频过程中的基波和谐波的位相分布进行了测量，给出了相应结果。

Small signal solution of aberrated second harmonic generation is deduced from three-dimension three wave coupling functions. The numerical work gives out lot of results of different aberrations. The effects of the fundamental wave's aberrations, which will change the conversion efficiency, distribution of intensity and phase in the frequency conversion, is analyzed. It shows that when walk-off and diffraction effects could be ignored approximately estimation of the phase distribution of second-harmonic wave could be done. The far field divergent angle and second moment radius of harmonic wave will vary with the aberration of fundamental wave, but the far field divergent angle will be obviously smaller than that of fundamental wave. The phase distribution of both fundamental and harmonic wave is measured using Hartmann-Shack wave front sensor in the experiment with 1064nm and 790nm lasers, respectively. Results are given.

首次从三维三波相互作用方程组推导得到了位相畸变光束倍频的小信号解；通过建立三维数值模型，编写相应仿真程序，首次得到了位相畸变光束倍频过程的大量计算结果，深入细致地研究了位相畸变光束经非线性光学频率变换后谐波的转换效率、光强分布、位相分布以及影响它们的各种因素；得出谐波的远场发散角和光斑二阶矩的变化规律会因为基波像差的不同而不同，但谐波的远场发散角明显地比相应基波的小的结论；得到了在走离效应和衍射效应等影响许多因素可以忽略的情况下，位相畸变传递到二次谐波的估算式；举例分析了KDP三倍频方案中，基波位相畸变对二次谐波和三次谐波的影响；实验工作中，用哈特曼-夏克传感器分别对1064nm倍频过程和790飞秒超短脉冲倍频过程中的基波和谐波的位相分布进行了测量，给出了相应结果。

Nine cases of SGCTs were identified and the hospital charts, clinic notes, and radiographs, including advanced imaging and angiograms for each patient were reviewed.

识别了9例SGCTs，回顾了每个病人的医院病历、诊断笔记和包括高级成像和血管造影在内的X光片。

Based on the third-order aberration theory,the pre-design parameters of the objective lens with aspheric surface were given.

基于三级像差理论，得出了采用非球面单透镜的平行光管的光学设计初始参数。

When we keep condemning others, we become the light that shine into people's eyes. Not only do we lose the function of illumination, but also cause aversions.

当我们一味的定人的罪，就像光直接照进人的眼睛里，不但没有达到照明的作用，反而给人带来反感。

Optical biological effect is no mapping visual effect which controls human biorhythm and affect human eyes.

光生物效应虽然是一种非映像的视觉效应，却控制了人的生物节律和强度，并且影响人眼瞳孔大小。

Anything that huge that could create or reflect light that bright and was that close to the radar should have 'blipped' like the Graf Zepplin blimp with a full metal jacket, and yet, I was still on radar even though this sphere was now directly between me and the radar - just NOT possible!

任何大的可以产生或者反射明亮的光东西而接近雷达应该有像有一件完整的金属夹克Graf Zepplin软式小型飞船一样的'雷达上的图像点'，然而，我仍然是在雷达上即使通过直接在我和雷达之间这个球体-就是不可能的！

The two riders were trapped between a towering brickwall and the police car, which was now crawling towards them like some growling luminous-eyes predator.

一刻钟的追逐后，两个骑摩托的人被困在警车与一面相当高的墙中间，警车像一个眼睛发出凶光的野兽。

FRIAR LAURENCE The grey-eyed morn smiles on the frowning night, chequering the eastern clouds with streaks of light, and flecked darkness like a drunkard reels from forth day's path and Titan's fiery wheels

黎明的曙光含笑地送别眉头紧皱的月夜，用光线在东方画出鱼鳞般的云霞，向黑暗撒下用光织成的鱼网；黑夜像晕头转向的醉汉，被太阳的火轮追赶出白昼的轨道。

Taking into action like an SAS soldier, I pulled on my civvies, dived my bare feet into a pair of old shoes, double-assured that the door key was with me and rushed out of the house like laser to the McDonalds not far away downstairs.

我像特种兵一样迅速行动，胡乱穿了件外套，连袜子也没穿，光脚穿着一双破鞋，拿起钥匙如离弦的箭般冲向楼下，好在那家麦当劳离这不远。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。