研究了稳态情况下一维宽光束在有偏压双光子中心对称光折变晶体中的调制不稳定性。
The modulational instability of one-dimensional broad optical beams in biased two-photon centrosymmetric photorefractive crystals under steady-state conditions has been investigated.
目的比较准分子激光的宽光束和小光斑飞点扫描切削模式对复性近视散光矫正效果的影响。
Objective We compared the efficacy of excimer laser flying spots mode and broad beam made for treatment of myopia with astigmatism.
这个塔又反过来把光以3米宽的光束集中反射到地上，这样可以产生热量和发电。
That, in turn, bounces the light down in a concentrated beam about a metre (3ft) wide to produce heat and drive generators.
在这种距离下，即便是聚焦良好的光束到达地球时也会分散到上千公里宽的面积上。
Over those distances, even a sharp laser beam would spread to thousands of kilometres wide by the time it reached Earth.
研究人员随后将X射线的光束收窄，使其只有十分之一毫米宽，这时他们发现，碎片形的区域只出现在射线照射的地方。
The researchers then narrowed down the X-ray beam so that it was just a tenth of a millimetre across and found that the fractal-like regions occurred only where the beam struck the sample.
如果一个光导纤维被缩减，那么光束也将在纤维不够宽的那个点上被捕捉，因为它无法穿越纤维。
If the optical fibre is tapered, the light ray will become trapped at the point where the fibre is no longer wide enough to let it pass any farther.
在激光光束质量问题中，光束束宽的定义至关重要。
The definition of beam width is significant for the quality of laser beam.
对平顶高斯光束有关的一些重要概念，例如场分布和束宽等作了物理分析。
Some important concepts relating to the flattened Gaussian beams (FGBs), such as the field distribution and beam width, are analyzed physically.
求解了两光束无量纲束宽参量的耦合微分方程。
The coupled differential equations of the dimensionless beam width parameters of two optical beams are solved.
根据透镜对高斯激光束束宽的变换原理，提出了一种由变换前后发散角的变化确定透镜焦距的新方法。
A new method of measuring the lens focus is presented, which is based onthe principle of transformation of the Gauss laser beam.
采用积分变换技巧，推导出了环状光束通过湍流大气传输二阶矩束宽的解析表达式，并研究了湍流对环状光束扩展的影响。
The closed-form expression for the mean squared beam width of annular beams propagating through atmospheric turbulence is derived by using the integral transform technique.
阐明了一种简单的宽角光束传播法在集成光学中的应用。
A wide Angle beam propagation method (WBPM) applicable to integrated optics is presented.
导出模式变换公式，分析了光束功率、光束初始的束宽半径和波前曲率半径的倒数对模式变换的影响。
The formulas of mode conversion are derived and effects of optical beam power, initial beam width radius and inverse of the radius of curvature of the wave front on the mode conversion are analysed.
使用复解析信号法研究了束宽与频率无关的超短脉冲贝塞尔·高斯光束在自由空间的传输特性。
Using a complex analytical signal representation, the free-space propagation properties of ultrashort pulsed Bessel-Gauss beams whose waist width is independent of frequency are studied.
详细测量了染料激光的性能，如线宽、功率、效率、脉宽、调谐范围、光谱纯度和光束质量等。
The characteristics of the dye laser, such as bandwidth, output power, efficiency, pulse duration, tuning range, spectral purity and frequency stability etc, are measured in details.
对于无吸收的光栅，参考光束相对物光束越宽，衍射效率将越高。
The results show that diffraction efficiency of a lossless grating increases with the higher ratio of reference beam width to object beam width.
然后分别描述了用光束质量分析仪器对宽脉冲激光器输出光束进行测量的装置、方法和测试结果。
Respectively, the width-pulse laser beam measured the output of the devices, methods and test results have been survey by the laser beam analyzing system.
通过与光束的空间传输特性类比解析了光栏宽度变化引起的脉宽变化以及脉冲轮廓出现时间衍射调制现象；
And a theoretical model is established to expound the variation of pulse duration and the modulation on the pulse envelope similar to the diffraction characteristics in spatial domain.
结果表明：对理想超高斯光束，半高全宽内包含的能量百分数最大不超过70%，且随着阶数增大而逐渐降低。
The results show that the percentage of energy in FWHM of the ideal super-Gaussion beam is no more than 70%, and it reduces with the order of the super-Gaussian beam increasing.
介绍EG&G公司生产的宽谱段无缝四象限光电探测器UV-14BQ-4的主要特性和功能，给出UV-14BQ-4在激光束定位系统中的应用实例。
The main specialities and functions of wide spectrum four-quadrant seamless detector UV-14BQ-4 produced by EG&G company are introduced.
结果表明，为得到高的转换效率，应努力改善泵浦光束质量，使晶体长度处于最佳值，并注意适当选择泵浦光强、波长和脉宽。
The results show that if the quality of pump light is improved, the crystal length is optimum, the pump intensity, wave leng...
结果表明，为得到高的转换效率，应努力改善泵浦光束质量，使晶体长度处于最佳值，并注意适当选择泵浦光强、波长和脉宽。
The results show that if the quality of pump light is improved, the crystal length is optimum, the pump intensity, wave leng...
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