锁相环路对噪声的抑制性能与锁相放大技术

本文从锁相技术基本原理出发,运用统计观点对噪声和干扰抑制作用从六个方面加以定性和定量分析,从而突出锁相环路的窄带虑波特性,并介绍了 SR510-型锁相放大器具有高精度、高灵敏度、高抗扰度和高增益放大的性能.     

ICP-AES法测定镍基高温合金中16个元素的方法研究

该方法采用ICP-AES法对镍基高温合金中16个元素进行了测定,系统研究了基体元素和共存元素对分析元素谱线的光谱干扰情况,进行了分析线的选择,测定了方法检出限,通过准确度试验和精密度试验,表明该方法准确、可靠、简便、快速。     

矩阵投影算法用于校正ICP—AES中的光谱干扰

本文将矩阵投影算法应用于ＩＣＰ－ＡＥＳ中光谱干扰的校正，在有关文献方法基础上，对残差作了进一步的校正，并采用最优化技术确定背景光谱的最优解，因而提高了方法的准确度。对实际干扰体系的校正结果表明，本方法能够对ＩＣＰ－ＡＥＳ中比较复杂的结构背景以及谱线重叠干扰进行较为准确地校正。     

Reflection and refraction of light by a system of interfering atomic states

The boundary problem of nonlinear optics was investigated for a trial wave reflected (refracted) by an excited region of a nonlinear medium considered as a system of multilevel atoms in the spectrum of which there are two closely-spaced energy levels excited by a powerful quasi-resonant radiation. It is shown that under interference conditions of the atomic states in the field of the trial and resonance waves there exist three types of waves: an inverse wave and two polarization waves. By way of extension of the Ewald-Oseen procedure to this case a formula for the complex refractive index of a nonlinear medium for the three types of waves as well as a generalized extinction theorem have been obtained. It is shown that the trial wave can be amplified without inversion of the interfering atomic states and that the refractive index can be markedly changed at certain concentrations of atoms in the medium. General formulas for the amplitudes of the reflected and refracted waves have been obtained. Ul’yanovsk State University, 42, Tolstoi Str., Ul’yanovsk, 432700, Russia. Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 65, No. 4, pp. 568–575, July–August, 1998.     

用计算机演示多缝衍射图样的缺级现象

利用计算机的图形功能，采用振幅矢量法演示多缝衍射光强分布曲线的动态变化过程及对应的振幅矢量合成图形，同时动态地演示影响缺级的各种因素的作用。     

基于广角FD-BPM的PML边界处理方法

本文提出了基于三阶Padé近似广角有限差分光束传输法(FD-BPM)的简单有效的完美匹配层(PML)边界处理方法.分别给出了该方法应用于斜波导和多模干涉(MMI)数值模拟的结果,并与用完全透明边界条件处理的模拟计算结果进行了比较.本文最后对基于广角FD-BPM的PML边界处理方法进行了优化.     

迈克耳逊干涉仪测激光波长的系统误差

本文探讨了迈克耳逊干涉仪测激光波长的系统误差的产生原因并提出了减小这一误差的方法。     

谐振腔马赫-曾德尔干涉集成光波导陀螺

研究了光学环形腔中的单方向传输光在光学谐振腔中传输的情况，在系统旋转角速率变化时光束会产生频移，在此基础上，设计出一种具有谐振腔马赫-曾德尔干涉集成光波导陀螺结构，可以方便地检测出系统旋转角速率与方向，其检测精度与光波导谐振腔的品质无关。和萨尼亚克集成光波导陀螺相比较，性能价格比有进一步提高的潜力。     

Effects of Quantum Interference on the Profile of Excitation Spectra in the Atomic Sodium D_1

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Induced Transparency for Gamma Radiation via Nuclear Level Mixing

A significant reduction of absorption of single gamma photons has been observed using the Mössbauer spectra of ⁵⁷Fe in a FeCO₃ crystal. The absorption deficit can be ascribed to partially destructive interference for absorption because of two indistinguishable absorption paths. The necessary coherence is created by means of level mixing produced by a suitable combination of a magnetic dipole and electric quadrupole interaction.