LD泵浦NYAB自倍频激光器和双波长激光器

研制出国内第一台用ＬＤ泵浦的ＮＹＡＢ自倍频激光器和双波长激光器。采用直接耦合方式进行端面泵浦。自倍频激光器产生 ０．５３１ μｍ的绿色激光，基横模运转，阈值泵浦功率为 １４．３１ ｍＷ，输出功率达 ２．２ ｍＷ，斜效率达 ２．１％。双波长激光器同时产生 ０．５３１ μｍ的绿色激光和 １．０６２ μｍ的近红外激光，基横模运转，阈值泵浦功率为１４．８１ ｍＷ，输出功率达 ９．２ ｍＷ，斜效率达 ７％。     

LD泵浦的YAG-KTP腔外倍频激光器

研制成我国第一台用ＬＤ泵浦的ＹＡＧ－ＫＴＰ腔外倍频激光器，阈值泵浦功率为３１．８ｍＷ，输出功率为０．２ｍＷ，斜效率为２％。文中简单报导了实验方法和实验结果。     

LD泵浦微片Nd∶YVO_4倍频绿光激光器

ＬＤ泵浦微片Ｎｄ∶ＹＶＯ４倍频绿光激光器①黄元庆叶艺文梅荣华（厦门大学新技术开发研究所厦门３６１００５）ＬＤ（激光二极管）泵浦固体激光器，是８０年代中期兴起的新技术，近年来发展极为迅速．这种全固化结构的激光器是一种高转换效率、高频率稳定性、窄谱线、微...     

LNYAB 自倍频激光器中的新现象

ＬＮＹＡＢ自倍频激光器中的新现象霍玉晶何淑芳（清华大学电子工程系北京１０００８４）王璞陆宝生（山东大学晶体所济南２５０１００）用一块体积为３ｍｍ×３ｍｍ×４ｍｍ、Ｎｄ３＋掺杂（原子质量分数为２％）的ＬＮＹＡＢ自倍频激光晶体同时作为激光晶体和倍频晶体。...     

氩离子激光器的倍频系统

为了获得用于制取全息高频光栅的光源，研制了Ａｒ离子激光器的腔外二倍频系统。采用ＡＤＰ晶体的温度位相匹配法，以半导体致冷器作为冷源，石英晶振用作测温传感器，并将ＰＩＤ实时控制算法用于智能型精密测控温系统中，研制出了控温精度达 ０． ０５ ℃的恒温装置。成功地实现了氩离子激光器的腔外倍频系统，将波长为５１４．５ ｎｍ的可见光信频得到波长为２５７． ３ ｎｍ的远紫外相干光，用这种光源可制得超高频全息光栅。     

光纤耦合的LD泵浦微型固体激光器

本文报导了一种光纤耦合的ＬＤ泵浦微型Ｎｄ：ＹＡＧ固体激光器．该激光器为连续波输出，最大输出功率达３２．５ｍＷ，斜率效率为１３．９％．这种连续波输出的Ｎｄ：ＹＡＧ激光器，可作为实验室的激光源使用．     

BBO晶体对皮秒YAP和YAG激光的腔内倍频

以ＢＢＯ晶体作为腔内倍频元件，研究带抗共振环对撞脉冲锁模Ｎｄ；ＹＡＰ和Ｎｄ：ＹＡＧ激光器的腔内倍频效应，在两种激光器中分别获得基波脉宽８ｐｓ和１０ｐｓ，倍频能量转换继７０．０％和６３．６％。理论分析和实验结果相吻合。     

光纤耦合的LKD泵浦微型固体激光器

本文报导了一种光纤耦合的ＬＤ泵浦微型Ｎｄ：ＹＡＧ固体激光器，该激光器为连续波输出，最大输出功率达３２．５ｍＷ，斜率效率为１３．９％，这种连续波输出的Ｎｄ：ＹＡＧ激光器，可作为实验室的激光源使用。     

LD泵浦NYAB晶体的激光自倍频特性

用LD作泵浦光源,在NYAB晶体上实现了1.06μm～0.53μm 的激光自倍频运转.泵浦(?)值功率为24.75mW,0.53μm 绿光最大输出功率2.2mW,最大转换效率为1.1%.     

"LD泵浦小型固体激光器"通过鉴定

1999年 1 2月 2 4日 ,由山东省教委主持在山东师范大学召开了“ＬＤ泵浦小型固体激光器”技术鉴定会 .与会专家认真听取了课题组卓壮教授等同志的汇报 ,实地察看了激光器系统的演示 .经过充分讨论 ,一致认为 :1 )课题组提交的鉴定材料齐全、完整 ,数据可靠 ,各项技术指标均已达到或超过原计划书所规定的指标 ,符合鉴定要求 .2 )该项研究研制了一台半导体激光二极管 (ＬＤ)泵浦Ｎｄ :ＹＶＯ4/ＫＴＰ腔内倍频的小型固体绿光激光器样机 ,激光器输出波长为 5 3 2 μｍ ,激光头外形尺寸仅为 4.2× 9.8ｃｍ .3 )ＬＤ泵浦的小型固体激光器是近年来…     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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