硅基上低维结构的受激发光

用514nm 激光抽运纳晶硅样品时,我们观测到表面上氧化结构在692nm 和 694nm处的尖锐受激发光,其明显的阈值行为证明了它的受激辐射特性.纳晶硅氧化结构通过激光辐照和退火处理来形成.解释这种受激辐射的模型已提出,其中纳晶硅与氧化硅之间的陷阱态起着重要的作用.     

SiO_2分子受激喇曼散射的理论计算

本文利用群论方法计算了ＳｉＯ＿２分子受激喇曼散射的跃迁矩阵元，给出了受激喇曼散射的截面和增益系数，较好地与实验结果符合。     

半导体激光器的发展及其应用

本文对半导体激光器的工作原理、发展历史和应用前景作一简略的介绍     

钠分子受激扩散带的时间特性

用５６８．３ｎｍ和５６８．８ｎｍ的激光混合共振激光发钠蒸汽，对钠分子从２＾３Пｇ跃迁到ａ＾３∑＾＋ｕ产生的紫外受激扩散带的时间谱进行了实验研究，并做了理论分析和计算机拟合，其结果与实验吻合，由此得到了有关能级的寿命及动力学参量。     

Ultra-high suppression microwave photonic bandstop filters

A bandstop radio frequency （RF） filter can enhance the capabilities of RF communication systems by removing unwanted signal components such as distortion, or interference. In modem cognitive radio systems, frequency agile filters are desired to block interferers with dynamically changing frequencies and powers. These filters should be tunable over a broad frequency range, and they should be capable of suppressing very strong signals with a high resolution. To simultaneously meet these requirements with traditional RF filters are highly chal- lenging. Microwave photonic （MWP）, a technology that primary deals with the generation, distribution, and processing of high speed RF signals using photonic techniques and components, is promising for creating frequency agile RF filters. However, traditional MWP filters are lacking the high resolution and peak suppression exhibited by state-of-the-art RF electrical filters. We recently introduced a new class of MWP notch filter which is free from this limitation. This scheme allowed the creation of anomalously high suppression MWP notch filter from virtually any kind of optical resonance, irrespective of its type （gain or absorp tion）, or its magnitude. This enabled, for the first time, simultaneous optimization of the MWP filter resolution, peak attenuation, and frequency tuning range. In this paper, we present the analysis of notch filter response creation using the novel sideband processing technique. We then show the applicability of this technique to a wide range of optical filters. We compare simulated and experimental results of the notch filter response created using three types of optical filter commonly used in MWP signal processing, namely stimulated Brillouin scattering （SBS）, an integrated optical ring resonator （ORR）, and a phase-shifted fiber Bragg-grating （FBG）.     

脉冲激光的受激拉曼散射效应

高峰值功率的调Q光纤激光器容易出现受激拉曼散射(SRS)。搭建了master oscillator power-amplifier(MOPA)结构的调Q光纤激光器,研究了其光谱与脉冲波形。实验研究了脉冲光在不同长度、不同种类光纤中传输时的拉曼散射效应,分析了其拉曼光谱特性及各光波的时域特性。实验结果表明:MOPA结构容易实现高峰值功率及参数可控的脉冲光。高峰值功率的脉冲在长距离传输时易出现多级拉曼散射光,且输出的各级拉曼散射光功率相当。一级拉曼散射光与抽运光在传输中是同步的。     

光外差法研究受激布里渊散射超声频移

The Jnteraction between a strong laser beam and a medium can induce an acoustic field in the medium. This kind of acoustic field will be enhanced along its propagation direction in the medium by electric-acoustic field coupling, and the laser beam will be scattered by it. This is     

机床激振实验

本文简要介绍了宁夏工学院机械系近二年本科生的一个综合性毕业设计－－机床激振实验，涉及到机床振动的固有频率、振型和阻尼等动力学特征的测试和数据处理。     

自发吸收原理

依据爱因斯坦关于辐射的量子理论的结论,基于对电磁能量放大现象、受激吸收、自发辐射以及受激辐射的研究,并结合随机电动力学理论,提出并论证了时空量子的受激辐射和自发吸收原理,认为"激发电磁能与自发吸收的时空能之和等于总的电磁能"。