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1)  rectangle-section laser crystal
矩形截面激光晶体
1.
The thermal effect of rectangle-section laser crystal induced by high power laser diode(LD) eccentric-end-pumped was investigated.
对激光二极管(LD)端面高功率偏心抽运矩形截面激光晶体引起的热效应进行了研究。
2)  the rectangle-section crystal
矩形截面晶体
3)  rectangular section
矩形截面
1.
Seven-freedom unit used for analysing the warping of rectangular section beam;
矩形截面直梁弯翘分析的七自由度单元法
2.
Calculation of bended structural member reinforcement of rectangular section of reinforced concrete;
简易法计算混凝土矩形截面受弯构件配筋量
3.
A spedal study is conducted of the effect of the rectangular section circulating bed edge angle on the gas-solid dual-phase flow and the radial porticle conecntration distribution.
特别是考察了矩形截面循环床边角对气固两相流动的影响。
4)  rectangle section
矩形截面
1.
This essay offers the calculation of magnetic field along axis of finite long rectangle section spiral tube current,gives the resolution formula and illustration of the magnetic field, and draws some significant conclusions by discussing on the calculation.
计算了有限长矩形截面螺线管轴线上的磁场,给出了磁场的解析式和图示,并对计算结果作了讨论,得出了一些有意义的结论。
2.
The formula prescribed in Code for design of masonry structures, aimed to calculate influence coefficient (φ) for bearing capacity of biaxial eccentric rectangle section compression masonry members, is numerically analyzed, its bearing capacity would increase when its eccentricity of loading is added, a new substitutive .
为此,对《砌体结构设计规范》中关于无筋砌体矩形截面的双向偏心受压构件承载力影响系数φ值计算公式进行了分析,认为φ值在局部范围内存在着使承载力随偏心距增大而增大等缺陷,并给出了新的计算公式。
3.
This paper offers the formulas of calculating the ledger beam strength, compares the bearing capacity of the ledger beams with that of rectangle section beams.
提出了花兰梁截面强度计算公式,揭示了其较按矩形截面计算较大的承载能力和一定的经济效益。
5)  rectangular cross-section
矩形截面
1.
After numerical simulation validity was confirmed by experimental results on cold model test,the erosion property in a circulating fluidized bed(CFB) with a rectangular cross-section was analyzed using numerical simulation under the condition of different primary/secondary air ratio,different up/down secondary air ratio and different front/back secondary air ratio.
在冷态试验对数值模型进行验证的基础上,通过模拟计算对不同一二次风配比、上下二次风配比以及前后二次风配比对矩形截面流化床锅炉内的磨损特性进行了分析。
2.
By analyzing all of the factors which will affect the eccentric distance limits of eccentric compression for rectangular cross-sections in this paper,it is believed that the eccentric distance can not be taken as the basis of eccentric compression,other.
文中通过分析影响矩形截面大小偏心受压偏心矩界限的所有因素,认为一般情况下把偏心矩的大小作为大小偏心受压的判别依据是不合适的,且还会因此在工程技术人员和初学者中形成对区别大小偏心受压的错误认识。
6)  rectangular cross section
矩形截面
1.
A practical formula for calculating the conductance of the tube of rectangular cross section in the full pressure range has been obtained based on a viewpoint that was proposed by the author.
利用作者提出的分层流动模型流导计算理论 ,对矩形截面长管道的流导进行计算 ,得到了全压强范围内适用的流导计算公式 ,计算结果与经验公式结果相符 。
补充资料:半导体激光泵浦的激光晶体


半导体激光泵浦的激光晶体
LD pumped laser crystal

  半导体激光泵浦的激光晶体LD PumPed lasercrystal适用于半导体二极管作泵浦源的激光晶体。传统的固体激光器一般用闪光灯泵浦,由于闪光灯的发光区域宽,只有一部分能量被吸收后转换成激光,大部分转换成热量,使工作物质温度上升,恶化了输出激光束的质量。半导体激光器输出的激光谱线窄(一般为几纳米),选择合适的半导体激光器,使其激光光谱与某种固体激光材料的吸收光谱匹配,即可达到高效泵浦,大大减轻固体工作物质的热负荷。 因为半导体激光器光泵区域小,需用的晶体尺寸也小,因此要求基质晶体内可掺入的激活离子浓度要高,且不产生浓度碎灭。此外,要求与光泵的半导体激光波长相匹配的晶体的吸收带要宽,吸收系数要大;要有低的阑值功率;Q开关运转时,荧光寿命要长。当泵浦光源从闪光灯改变为半导体激光二极管时,对被泵浦的激光晶体产生了不同的要求。用闪光灯泵浦时,对材料的热性能和机械性能有严格要求,而半导体泵浦则更注重材料的光谱性能。 在已使用的激光晶体中,掺钱石榴石(Nd:YAG)晶体的阑值功率低,光学质量高,是应用于半导体激光光泵的固体激光器的主要材料。由于Nd3+离子在基质晶体中受分凝系数的限制,Nd3+离子浓度不能太高,所以一些氟化物和钨、钥酸盐晶体等掺杂浓度高,激光效率高,荧光寿命长,有可能成为半导体激光泵浦的后选晶体。 用半导体泵浦可制成效率高、功率和频率稳定、激光束质量好、寿命长的全固化激光器,并经各种频率转换技术,可发展成各种波长、各种模式、各种运转方式的激光器,这种激光器将在很大范围内取代已有的各类固体、液体和气体激光器。 (沈鸿元)
  
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