激光束

An all-optical high sensitivity atomic magnetometer is investigated and demonstrated experimentally, of which the principle is based on the interaction between laser beam and rubidium atoms in magnetic field.

报道了一种全光学的高灵敏度铷原子磁力仪。其原理是基于激光束与处于微弱磁场中的铷原子的相互作用。

The relationship of variation rate between the scan light beam length after passing through the deflector and the fast voltage pulse wasderived.

导出激光束通过偏转器后扫描光线长度与加到偏转器上的快速电压脉冲变化率关系，并在实验中分别用MOS管和雪崩管高压电脉冲发生器取代价格昂贵的冷阴极管高压电脉冲发生器，获得激光脉冲宽度压缩约两个量级，且实现激光脉冲宽度可调。

The conclusion is provided as a theoretical basis for practical application. Furthermore, from both sites of experiment and theory, the kinematic accuracy and laser scanning accuracy of the LPS-600A machine are studied.

从理论和实验两方面研究了机械运动精度及激光束扫描精度的影响因素，利用激光双频干涉仪对LPS-600A的机械运动精度进行了测试。

When parallel laser beam is irradiating the bubble in the prism, circular interference fringe is produced in the far-field. Based on the far-field theoretical model, the angle position of interference fringes outside the prism is measured with spectrometer and converted into the angle position of interference fringes inside the prism according to Snell's law and then bubble diameter is calculated with computing software Mathematica, the relative difference of which is 0.2%.

平行激光束照射到棱镜中的气泡时，在远场将产生圆环状干涉条纹，利用气泡远场干涉理论模型，使用分光仪对三棱镜外干涉条纹角位置进行测量，由折射定律换算为棱镜内干涉条纹角位置，进而使用计算软件mathematica计算出气泡直径，其相对差为0.2%。

A recording pulse signal includes a mark period irradiating the laser beam for forming the recording mark and a space period in which the recording mark is not formed.

记录脉冲信号包括照射激光束以便形成记录标记的标记期间和其中不形成记录标记的间隔期间。

BSpatial characterization of laser induced Cu plasma in air with different laser focusing distancesThe plasma spectra induced by pulsed laser ablation of copper target are measured. By adjusting the distance of the len-sample, the spectrum of air spark plasma、 Cu plasma and the reciprocity of both plasmas are analysed. From the result, it has been shown that the focusing of the laser beam has an important infunence to analyse the properties of the sample.

b 不同的激光焦点位置产生的等离子体光谱的空间特性研究激光烧蚀置于空气中的Cu靶产生等离子体，通过调节透镜与Cu靶的距离，本文观测了激光烧蚀空气产生的空气火花等离子体、激光直接烧蚀铜靶产生Cu等离子体以及空气火花等离子体与Cu等离子体相互作用等不同情况下的激光诱导击穿发射光谱，激光束焦点的位置在分析材料性质的过程中有着重要的影响。

Thetransverse trapping force can be increased effectively by modifying laser profile, whilethe axial stability of the system is still assured.It will directly affect noise subdual andimprove the steering speed of optical trap.

通过改善激光束形状，在保证纵向作用力的同时，可有效提高光镊系统横向稳定性，这将有利于系统噪声的抑制，及光阱位置操纵速度的提高。

Radius variation of image beam waist due to spherical aberration, which varies with the position of objective beam waist, and optical system focus is analyzed with the form of curve. At last,a design example of optical system used for laser plume attenuation testing system is given to illustrate the effect of spherical aberration on the image beam waist.

本文还提出了在设计过程中存在的球差对激光束像方束腰的影响，对其进行了理论分析，并给出了数学模型，总结出高斯光束的像方束腰半径与物方束腰位置、光学系统焦距之间的关系，并对本光学系统的设计进行了验算。

The geometry, electronic structures and electronic spectra of trans stilbene derivatives are systematically studied by PM3 and INDO/CI methods.

分子在强激光束作用下，能同时吸收两个光子的现象称为双光子吸收。

In Fig. 9, it is clearly seen how the shape, tangency and curvature of projected laser beam is changing in dependence of surface slope, while the turret head with a tool insert istravelling at a very slow feedrate.

在图。九，这是清楚地看到如何的形状，切和曲率预计激光束是在不断变化的依赖表面的斜坡，而炮塔头的一个工具插入istravelling在一个非常缓慢的进给速度。

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。