A compact, highly stable CW CO2 laser without brewster windows

We describe an open resonator, quasi sealed-off; 70cm cavity length CO₂ laser with very high stability of power and frequency, which lases on 96 lines from 9R42 (2W) to 10P52 (5W) with a power of >11W on 9R20, 9P20, 10R20 and 10P20, plus on 18 hotband lines with ≈2W. This laser was used successfully to pump an FIR ring laser [1] enabling an FIR power stability of ΔP/P ≈ 10⁻⁴ by use of a simple PI control loop, thus demonstrating its superb frequency stability.     

纵向泵浦Tm：YAG激光器的理论研究

用准三能级系统速率方程对纵向泵浦Ｔｍ：ＹＡＧ激光器的阈值，效率和激活介质最佳长度进行了计算和分析，讨论了温度对Ｔｍ：ＹＡＧ激光器输出特性的影响。     

Threshold pump strain for parametric amplification inn-indium antimonide

Phenomenological approach has been used to determine the threshold pump strain by assuming that at this strain the pump generates an electric field for which the drift velocity of the carriers equals the sound velocity. Numerical values obtained forn-InSb have been compared with similar studies which are based on Boltzmann transport approach.     

电动流动分析的色谱分离研究

建立了一种基于增压电渗泵驱动、整体柱分离和紫外检测相结合的电动流动分析系统。研究了载流溶液中甲醇的体积分数对电渗泵空载流量、输出压强、移动相流量和分离度的影响。在4950V的外加电压下,以含0.5mmol/L六亚甲基四胺的45%甲醇溶液为泵载流,电渗泵的流量和输出压强分别为0.58mL/min和0.79MPa,以泵载流为流动相,该系统对苯和萘进行了反相色谱分离。电动流动分析系统设备简单、操作方便、功能多样。对苯和萘的分离结果表明,电动流动分析系统可用于样品的色谱分离。     

激光二极管泵浦Nd：FAP激光器

报道激光二极管泵浦的掺钕氟磷酸钙固体激光器，该器件在重复频率为１００Ｈｚ的准连续状态下运行，当耦合输出透过率为８％时，得到３１％的斜效率，比较了ＦＡＰ和ＹＡＧ这两种介质的激光器的性能，理论分析得出的两者的阈值泵浦功率的相对值与实验结果相一致，并证实ＦＡＰ是一种有前途的适合激光二极管泵浦的激光介质。     

Tunable 5-watts Ti:Al_2O_3 laser oscillating with a quasi-continuous wave pumping

Abstract: An investigation of the output characteristics of Ti:Al_2O_3 laser pumped by the second harmornic generation from an acoustooptic Q-switched Nd : YAG laser is made. An average output power of 5 watts has been obtained when the pump power is 14.5 watts. The slope efficiency is 55.5％, and the quantum efficiency is approximately 80％.     

离心泵蜗壳内部高粘油时均流动的LDV测量

本文用LDV测量了最优工况和小流量工况下，输送运动粘度为48mm2／s高粘油时，蜗壳第Ⅳ、Ⅵ和Ⅷ断面内的时均切向、径向速度。给出了角动量随半径的变化关系，并与输送粘度为1mm2／s水时的角动量进行了比较。     

高层住宅水泵房噪声与振动治理

为解决高层居民住宅生活用水和消防用水，一般均设置水泵房，若水泵房设计安装不当，将成为扰民的噪声源和振动源。本文以上海几栋高层住宅水泵房为例，通过采取隔振，软联接等措施，有效地控制了振动传递，降低了噪声，达到了环保标准要求。     

叶片式多相泵内部流动研究

目前已经研制成功的多相泵主要有两种；容积式和叶片式，对于叶片式多相泵来说，研究其内部的相态分离过程对进一步改善其性能具有重要的意义．本文应用双流体模型，建立了叶片式多相泵内部流动的基本方程组，在此基础上，分析了多相泵内部的能量平衡关系和气液两相间的相态分离过程，给出了改进叶片式多相泵性能的设计方法．