激光

The relation is studied in this paper When the angle between the laser polarized direction and the plane of incidence of laser is zero degree, the amplitude of phot...

本文通过实验研究了在相同的激光入射角的情况下，光声信号的大小随激光偏振方向的变化关系，得出了激光偏振方向与激光入射面的夹角为0 度时，光声信号最强；而其夹角为90 度时，光声信号为极小值。

The invention relates to a light pumping system for all-solid laser, particularly a light pumping system for disc type laser, comprising heat sink, laser crystal, optical fiber, plane reflector, a first concave reflector, a second concave reflector, and a third concave reflector, and adopting a structure that the plane reflector is between the optical fiber and the first concave reflector, to make the LD and laser cavity on the same side of the laser crystal, thus reducing the packaged size of the laser; the invention fixes the plane reflector on the heat sink to reduce the inclined incident angle of the pumped light beam, thus the pumped light can be fully absorbed, and the invention solves the problem of pumping efficiency and largely reduces the bulk of the laser, beneficial to the all curing of the product and ensuring the cooling requirement of the laser crystal.

本发明涉及全固体激光器的光泵浦系统，特别是一种盘式激光器的光泵浦系统。包括热沉1、激光晶体2、光纤3、平面反射镜4、第一凹面反射镜5、第二凹面反射镜6、第三凹面反射镜7，本发明采用平面反射镜位于光纤与第一凹面反射镜之间的结构，使LD和激光腔位于本发明激光晶体的同一侧，从而减小了激光器的封装尺寸；本发明将平面反射镜固定在热沉上，使泵浦光束斜入射角减小，泵浦光则能充分吸收，为此，本发明解决背景技术采用第一凹面反射镜使泵浦光束斜入射角过大引起的像散，泵浦光斑变形引起泵浦效率降低问题，使得本发明可选用大面积半导体制冷器，避免使用水冷，则激光器的体积大大减少，有利于产品的全固化，保证了激光晶体的散热要求。

This dissertation involves the study of the growth dynamics of colloidal particles under unequilibrium and irreversibility condition. Firstly, it is of interest to investigate whether the ideal diffusion or reaction-limited aggregation universal behavior can be observed for the initially polydisperse practical system of basic yttrium carbonate as well. The fractal structure of basic yttrium carbonate aggregate cluster was observed using transmission eletron microscopy. The aggregation kinetics of basic yttrium carbonate colloids was studed using dynamic 1ight-scattering techniques. At 1.00mol/l NaCl solution the fast diffusion-limited aggregation behavior was observed with an increase in the aggregate size over time described by a power law. The aggregates are characterized by a fractal dimension D=1.82. The disordered and ramified cluster is consisted of primary colloidal particles and tenuous and more open. These are in good agreement with those observed for other colloidal system such as colloidal gold (1.86), silica (1.85) and polystyrene latex (1.82) in diffusion-limited aggregation from the static and dynamic light scattering by Lin. Therefore ideal diffusion-limited aggregation behavior can be observed in practical polydisperse system as well. Smoluchwski and fractal theories were used to obtain the aggregation rate constant for initially polydisperse system for the first time.

本论文研究胶粒的非平衡不可逆聚集动态学，分为两个部分，第一部分是通过实验研究一个新的初始多分散的碱式碳酸钇胶粒实际体系中，聚集标度性质的普适性，即使用透射电子显微技术观测聚集粒子簇的分形结构，使用动态激光光散射研究碱式碳酸钇胶粒的聚集动力学，胶粒带电而产生静电排斥作用使得碱式碳酸钇胶粒处于稳定状态，当加入电解质NaCl溶液时，碱式碳酸钇胶粒间的Debye-Hückel屏蔽距离缩短，从而降低静电排斥能垒，引起胶粒发生不可逆聚集，加入电解质NaCl的浓度为1.00mol/l时，碱式碳酸钇胶粒进行快速聚集，经历扩散控制聚集机理，形成结构疏松、更为开放的分形聚集粒子簇，其分形维数为1.82，碱式碳酸钇胶粒聚集增长动力学遵循幂函数增长规律，与Lin等使用静态激光光散射和动态激光光散射测量硅胶(1.85)、金胶(1.86)和聚苯乙烯胶乳(1.82)在扩散控制聚集状态形成聚集粒子簇的分形维数值以及粒子簇聚集增长的动力学规律相一致，表明胶粒聚集标度性质的普适性质在初始多分散的实际体系中也是存在的，首次由动态激光光散射的实验数据得到初始多分散胶粒分形粒子簇的聚集速率常数，并且其值与Smoluchowski聚集速率理论预期相符。

Laser's far-field divergence angle is one of its important functional criteria. It not only reflects the laser divergence in the distance, but also can be regarded as the important foundation for laser re-formation.

激光的远场发散角是激光性能指标中的重要一项，不仅反映远距离传输的激光发散特性，而且可以作为激光的整形的重要依据。

The mechanism of pulsed laser milling is introduced briefly,and the effects of the technological parameters such as the single pulse energy of laser, the repetitional frequency,the laser beam scanning speed and the assistant huffing pressure are investigated.

在分析脉冲激光铣削材料去除机理的基础上，系统研究了激光单脉冲能量、重复频率、激光束扫描速度和辅助吹气压力等工艺参数对硬质合金激光铣削量和质量的影响，观察不同工艺参数条件下激光铣削的表面微观形貌。

Two mechanisms for laser cleaning rubber layer are suggested: one is the combustion and vaporation of upper rubber layer resulted by high temperature of laser beam, the other is the vibration of deep rubber layer as well as thermal shock action by laser pulse to make rubber particles sputter.

激光清洗橡胶的机理有二：一为激光产生的高温导致橡胶表层瞬间燃烧和气化；二为橡胶深层受热振动和激光脉冲的热冲击作用使铝片表面橡胶颗粒飞溅。标签激光清洗橡胶层机理阈值清洁率 laser cleaning rubber layer mechanism threshold cleaning percentage

Methods: Fresh canine kidneys and porcine ureters were harvested and subjected to thulium laser and femtosecond pulse laser , respectively.

分别采用铥激光和飞秒脉冲激光对离体犬肾组织和猪输尿管组织进行体外实验，观察(1)在模拟腹腔条件下，低流量冲洗液抑制铥激光产生烟雾的效果和(2)飞秒脉冲激光切割离体猪输尿管的效率与副损伤程度。

Wide business scope is including Laser imaging system, Laser typesetter systems and Laser plotter related to high mixtures of optics, micro-electronics, precise mechanics, software.

公司的主导产品是集激光、精密机械、微电子、系统软件等于一体的激光照排系统、激光光绘系统、激光影像系统。

Using a nonperturbative scattering theory developed by Guo,Aberg and Crasemann the angular distributions of electrons in above threshold ionization of Krypton atoms irridated by a bichromatic phase-controlled laser field of linear polarizations is studied. The bichromatic phase-controlled laser field is composed of a sequence of identical one-cycle laser pulses.

采用基于Guo， Aberg 和Crasemann发展的强激光场中的非微扰量子散射理论，研究了线偏振双色激光场中氪原子阈上电离的光电子角分布，双色激光场由一系列相同的单周期激光脉冲组成。

Methods Immediately after branch retinal vein occlusion model was made by argon laser in 40 eyes of 20 normal rabbits, the rabbits were divided into two groups. In the first group,there were 10 rabbits treated with the argon laser followed by the Nd∶YAG laser induced chorioretinal venous anastomosis.

灰色家兔20只（40只眼）用氩激光建立视网膜分支静脉阻塞模型，模型成功家兔随机分为实验组10只（20只眼），用氩激光随后用Nd∶YAG激光；对照组10只（20只眼），单独用氩激光诱发形成视网膜和脉络膜静脉间的吻合。

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。