激光束

This means that although they are more focusable than a hand torch say, the size of spot they can be focused to is still relatively large, limiting their use.

但高能量的激光二极管不能产生完美的激光束，这意味着他们虽然比手电筒更有聚焦能力，它们能聚焦的光斑尺寸仍然相对很大，从而限制它们的用途。

The construction and the principle of the two-dimensional galvanometric scanner laser scanning system are theoretically described.

对二维振镜激光扫描系统组成和原理进行了理论描述，讨论了在视距范围内采用扩束装置和振镜系统对激光束实施可靠控制的方案，并在水下光通信系统中有效地完成了对水下和空中运动目标所在区域的扫描。

The construction and the principle of the two-dimensional galvanometric scanner laser scanning system are theoretically described. The methods to effectively control the laser beam with bunch expanding devices and the galvanometric scanner system in the visible range and finish the scanning of the area of the goal underwater and in the air in the underwater optical communication system.

对二维振镜激光扫描系统组成和原理进行了理论描述，讨论了在视距范围内采用扩束装置和振镜系统对激光束实施可靠控制的方案，并在水下光通信系统中有效地完成了对水下和空中运动目标所在区域的扫描。

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When a collimated laser beam illumines the curved liquid surface by the wetting rod, the special reflective patterns, which correspond to the boundary light reflection, can be produced. In fact, there is the pattern with dark central region and the high visibility diffraction fringes around, and the radius of dark region largen with the reduced radius of the incident beam.

当平行激光束垂直入射到由细棒润湿效应引起的弯曲液面上时，边界反射产生特殊的反射图样，图样的中心为圆形暗场，周围有清晰的衍射条纹，并且暗场的半径随入射光束半径的缩小而变大。

The propagation modes in the lenslike medium , including the spot size, field distribution pattern and their propagation constant,are obtained by solving the Helmholtz equation in the cylindrical coordinate.

从求解柱坐标内亥姆霍兹方程出发，导出了类透镜介质传导模的特征参量、场分布状态及传播常数，求出了入射激光束和导模之间的耦合系数，并讨论了它们的物理意义。

Noncollinear second-harmonic-generation processes involving an unfocused laser ham and itS scattered radiation produce one or more cones of phasematched second harmonic.

激光束与其散射光束在晶体中发生非线性和频作用，在满足非共线相位匹配条件时，可观察到二次谐波环的现象。

To study the lethal effect of high power near infrared diode laser on Locust Nymphae. Oedaleus asiaticus B. Bienko Nymphae that are the third age or before the third age and after the third age were irradiated aiming at the head in different time and power density by the power of 2W and the wavelength of 808nm diode laser. The death-ratio was observed especially after irradiation, five hours after irradiation and 20 o clock the next day after irradiation.

为研究大功率近红外半导体激光对蝗蝻的致死作用，选择采用功率2W、波长808nm的半导体激光器，针对三龄及以前龄期和三龄期后亚洲小车蝗蝻虫分组试验，激光束对准蝗蝻头部位置，进行不同功率密度、不同时间的照射试验，分别观察照射后即刻、照射后5小时和照射后次日蝗蝻的致死率。

The photo decomposition reaction of lead styphnate is a simple thermal decomposition reaction, in which light energy rise will increase the rate of decomposition reaction of lead styphnate and the decomposition reaction has clear stages at higher light energy.

激光束能量增大能明显地提高斯蒂醋酸铅的分解反应速率，而且在较高的光能量下，分解反应出现明显的阶段性。

Using two perfect plasma models(concentric sphere and variable focus ellipsoid), which have different shape and different gray distribution, the different cross-section tomograph figure and the gray density diagram are presented . The offset distance formula , which describes the laser beam penetrates through the laser welding plasma, is presented.

对两种理想的等离子体模型(三同心球体和变焦距椭球体)进行了分析，建立了不同剖面的密度分布层析图，给出了激光束穿越球形等离子体时由于折射引起的对光轴的偏移距离的公式。

I can not make it blossom and suits me

我不能让树为我开花

When temperatures are above approximately 80 °C discolouration of the raceways or rolling elements is a frequent feature.

当温度高于 80 °C 左右时，滚道或滚动元件褪色是很常见的特征。