激光

The dispersion of particles are also related to the interactionbetween nanosilver and polymer. Nanosilver dispersed well in PS, while form larger branchedclusters in PMMA, and polymers could prevent nanoparticles from aggregation. The interaction between nanosilver and polymers depends on the properties of polymers and treatment. XPS results indicated that no obvious interaction between nanosilver and PS was foundbefore and after heat treatment; for AS matrix, there exists a interaction between nanosilver and AN,moreover AN on the nanosilver surface could cyclize and lose N after heat treatment at 150℃ for1h; for PMMA matrix, there exists a interaction between nanosilver and O atoms, heat treatment at150℃ for 1h could lead to the reaction between Ag, S and O in the interlayer of composite andchange the interface interaction.

纳米银粒子的加入改变了聚合物体系对激光能量的吸收和转换方式，导致其激光离解方式的变化，通常此种粒子会促进聚合物的炭化，且在界面可能有诱导石墨化的作用；而银粒子自身的离解及其对基体激光离解的作用都受两相的界面相互作用的影响，即与聚合物基体的性质、后处理等有关，热处理后两相界面的变化对PS和AS体系的炭化影响不大，但PS体系中银团簇的最大原子聚集数减小；而对PMMA体系则基本上消除了激光炭化。

Recent years, laser medicine in vascular disease and dermopathy have enormousdevelopment, and researchs indicated that repetition Q-switch Nd:YAG laser hasextensive prospect. The double-pulsing Q-switch Nd:YAG laser (1064nm or 532nm)can cure dermopathy, and the repetition Q-switch Nd:YAG laser can cure vasculardisease.

近几年激光治疗血管类疾病和皮肤色素类疾病的医学研究表明，重复率Q开关Nd：YAG激光器在激光医学应用中有着新的广阔的前景，其中一类是用双脉冲Nd：YAG激光(1064nm或532nm)治疗皮肤类疾病，另一类是用重复率Nd：YAG脉冲激光治疗血管类疾病。

A detector array target of laser distant-field detect system is designed, and two key factors are analyzed. To determine the size of the array target, the laser diffract effect and the influence of atmospheric turbulence are discussed, three factors that influence the resolution of the array target are analyzed. Three factors are the dimension of laser speckle resulted by atmospheric turbulence, space sampling frequency based on sampling theory and the loss of the frequency spectrum function of the array detector.

设计了一种激光远场直接探测系统，对系统中的两个关键问题进行了讨论，一、在探测器阵列靶板尺寸的确定问题上讨论了激光的衍射效应和大气湍流的影响；二、在探测器阵列靶板分辨率的确定问题上讨论了激光的衍射效应和大气湍流的影响；对第二问题讨论了对其有影响的三个方面：大气湍流引起激光碎斑尺寸，由采样定理决定的空间采样率，由阵列探测器的频谱函数引起的损失。

ANSYS is a finite element simulation software used to simulate the temperature field in selective laser sintering.By using the ANSYS parameter design language,the density of the thermal flow,the velocity and the path of scanning can be controlled.The effect of the scanning path on the temperature field in the SLS process is studied. Balling,which occurs at the end of the scanning line,is caused by the dissymmetric temperature field and the great temperature gradient.

利用有限元分析软件AN SY S，对激光烧结温度场进行了数值模拟，建立了激光烧结薄板的温度模型；运用APDL语言控制热源的热流密度、移动速度以及扫描轨迹；研究了激光行程对烧结温度场的影响，扫描端点温度场的不对称及较大的温度梯度造成了端点球化现象；激光扫描线间的耦合作用使端点球化现象随扫描线的增加而逐渐显著。

At the same time, with the rapid development of the ultrashort-laser-pulse technology, the focusable intensity of 10〓W/cm〓 can be realized on a compact table-top laser system, which can support the electric field that is much higher than that in H atom.

同时，随着超短超强激光技术的飞速发展，目前在小型化台式激光系统上，可聚焦功率密度已经达到了～10〓W/cm〓的量级，在这种功率密度下，激光场强度已经远远超过氢原子的内部库仑场强，激光与物质的相互作用已经进入极端非线性的领域。

For choosing a material to interfere with IR and laser,the IR and 10.6μm laser transmissivity of micron-copper powders of different components were tested in the smoke chamber,when the concentration of the smoke reached 1.0 g·m-3,the transmissivity of 1~3μm,3~5μm and 8~14μm IR under 30%,and the transmissivity of 10.6μm laser under 20%,the attenuation ability of red copper powders,green and red copper powders and green copper powders to IR and 10.6μm laser increased gradually.At the same time,the interferent...

为选择一种能够遮蔽红外与激光的烟幕干扰材料，在烟幕箱中测试了组分配比不同的微米铜粉的红外与10.6μm激光烟幕透过率，当烟幕浓度为1.0 g.m-3时，1~3μm，3~5μm，8~14μm红外的透过率均小于30%，10.6μm激光的透过率小于20%，红光铜粉、青红光铜粉和青光铜粉对红外与10.6μm激光的衰减能力逐渐增强；同时测试了微米铜粉对红外热像仪的干扰效果，浓度为2.0 g.m-3时，青光铜粉能够完全遮蔽红外热像仪。

PCSS-driven Pockels cells: the PCSS delivers a sub-nanosecond pulse to an electro-optical crystal which controls the lasing efficiency in laser cavities ranging from microchip microjoule lasers to table-top multiJoule lasers.

PCSS 驱动的 Pockels 细胞： PCSS 递送子十亿分之一秒脉膊给一个电镀物品-光学的在激光中控制激光法效率的水晶洞排范围从微集成电路 microjoule 激光到桌子-顶端的多焦耳激光。

When the peak intensity of the laser pulse exceeds the relativistic laser intensity, the electric field parallel to the propagation direction of the laser will emerge by rather large amplitude under the effect of the ponderomotive force.

激光的有质动力加速是指当激光强度大于相对论光强时，除了电子的横向振动，激光的振荡电场在有质动力的作用下将产生极大的沿激光传播方向的分量。

Our theory predicts the minimum value of ponderomotive parameter and the corresponding critical laser intensity, below which no diffraction can occur; 6, We studied the energy transfer of a two-level atom moving in a cavity field, as well as its influence on the atomic emission spectra and on the photon distribution of the intro-cavity field.

我们用两对激光模来模拟紧聚焦的高斯光场，成功地得到了《Nautre》上Batleaan等人的实验观测结果，预言了有待实验进一步观测的新现象，并确立了发生电子衍射的激光场的临界强度； 6，研究了原子在激光场中运动时光场与原子之间的能量交换，以及这种能量在光谱上的反映和对激光场统计性质的影响。

For a relatively longer intense short-pulse laser, especially when local phase matching in the laser pulse between the ponderomotive force and the wake plasma oscillation occurs, there is strong electron acceleration in the laser-excited wake field and weak acceleration inside the laser pulse.

对于脉冲相对较长的短脉冲激光，尤其是在激光脉冲内等离子体尾波振荡和有质动力发生局域的相位匹配时，在激光激发的尾波场电子有很强的能量，这时在激光脉冲内电子的有质动力加速效率很低。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。