four-level system

The transformation of density matrix of four-level system in solid laser

固体激光器的四能级系统密度矩阵元的演化特性

Effect of Relative Phase on Probe of Y-Type Four-Level System

Y型四能级系统中相对位相对探测场的影响

The Discussion of Atomic Coherence Effect in Four-level System

四能级原子相干系统的探讨

Quantum interference of quasi - ∧ - type four-level system

准∧型四能级系统中的量子干涉现象

Laser induced four-level system population transfer

激光诱导的四能级系统电子布居转移

Optical Bistability of Four-Level System with Triple State

有三重态的四能级系统的光学双稳态

Study on the ac-Stark splitting in a four-level system

四能级系统中ac-Stark分裂研究

The time characteristics of a pulsed Ti : sapphire laser have been studied theoretically based on the rate equation of four-level system .

本文从四能级结构激光速率方程出发，对脉冲掺钛蓝宝石激光器的时间特性进行了理论研究。

The population transfer in a quasi-lambda four-level system driven by unmatched Gaussian pulses is investigated .

本章研究用非匹配高斯脉冲实现四能级准∧型系统中的相干布居转移。

Based on the rate-equation theory of four-level system , the expressions of threshold pump power , output power and slope efficiency are given .

在本章中，我们首先从四能级激光系统空间速率方程理论出发，得到了阈值泵浦功率、输出功率和斜效率的表达式。

Based on the model of cw end-pumped four-level system , compared the direct and indirect pump laser performance of the pump . 3 .

在连续端面泵浦四能级系统模型的基础上，比较了直接泵浦和间接泵浦的激光性能。

Single-photon Raman and super-Raman processes in two-photon resonantly pumped four-level system

双光子共振泵浦四能级系统的单光子过程、喇曼过程和超喇曼过程

Experiment part of this letter achieves interference enhancement of two-photon absorption firstly in sodium dimmer rhomb-type four-level system .

本文的实验部分首次得到了有关分子中双光于吸收干涉增强的结果。

The results of the studies indicate that the time-evolution of atomic particle 's occupancy of the four-level system is nonperiodic .

计算结果表明，四能级系统原子粒子数布居的时间演化不具有周期性。

In this paper , we use the dressed-atom approach to derive the analytical expression of the gain of a FIR laser with a four-level system .

本文用缀饰原子方法解出四能级系统远红外激光增益系数的解析表达式。

Base on the principle of laser , four-level system rate equations theory is analyzed in the paper . The work threshold , maximum output power and total efficiency of laser are discussed .

本文首先分析了四能级系统的速率方程，并从理论上推导了激光器的工作阈值、激光器的输出功率及输出效率等问题。

The fourth contribution is to provide the four-level system model of the deep development of eco-tourism , which is benefit for the ecological region to develop eco-tourism futher .

第四、给出生态旅游深层开发的四级系统模式。从而为生态旅游区的进一步开发提供有益的参考。

A four-level system coupled with lasers is analyzed in terms of dressed-atom model by introducing auto-ionization decay which leads to a non-Hermitian Hamiltonian .

分析了一个脉冲激光与原子相互作用的四能级系统，并考虑最上层能级的自电离过程，从而引入非厄米哈密顿量。

We summarize research conclusions of two nonlinear effects in quasi-lambda four-level system , and propose some shortcomings in this paper . At last , we put forward outlook of research and application prospect in future .

综述了在准∧型四能级原子系统中两种非线性效应的研究结果，提出了文章中的一些不足之处，最后展望了其在未来的研究和应用前景。

Based on the phase-conjugation polarization interference between two two-photon processes , we theoretically investigated the attosecond scale asymmetry sum-frequency polarization beat in four-level system ( FASPB ) .

基于两双光子过程的相位共轭二阶极化干涉，从理论上研究了四能级系统在阿秒量级的不对称和频极化拍频（FASPB）。

With ignoring the Excited State Absorption ( ESA ) and Ampli-fied Spontaneous Emission ( ASE ), the rate-propagation equations of the four-level system are simplified properly .

在忽略放大的自发辐射和激发态吸收的基础上，简化了四能级模型的速率-传输方程。

At present , the administrative hierarchy of local governments in China is based on Province-City-County-Township four main administrative levels . When the city county was implemented initially , the four-level system administration had played an active role .

现在，我国地方政府实行的行政层级结构是以省市县乡四级为主，在市这一级行政建制刚实行的时候，四级行政层级，包括市管县体制都发挥了积极的作用。

Using electric dipole moment and the rotating wave approximation and matrix theory , the dispersion and absorption properties of the quasi-lambda four-level system driven by different relative phase are investigated on the condition of the interaction representation .

在相互作用表象下，运用电偶极矩和旋转波近似及其密度矩阵方程理论，探讨了准∧型能级系统中相干光场之间的不同的相对相位对探测光场的色散和吸收的影响。

The higher-order coherence function theory has been applied to study the nonlinear effects of fifth-order on polarization beats of a four-level system when beams are narrowband in Markovian-fields ( NFPBFMS ) .

本文采用高阶相干函数理论研究了四能级系统在Markovian场下的窄带五阶非线性效应（NFPBFMS）。

In this article , we present a scheme of sub-half-wavelength localization of moving atoms , basing on the phase-dependent electromagnetically induced transparency in a four-level system in the double-A configuration .

本文提出了一种运动原子亚半波长局域化方案。该方案是基于四能级双人原子系统中相位依赖的电磁诱导透明现象。

In this paper , the semiclassical density matrix treatment was applied to four-level system for optically pumped NH_3 molecular submillimeter wave ( SMMW ) lasers , which was pumped by CO_2 laser and microwave simultaneously .

以NH3分子气体为工作物质，对CO2激光和微波同时作为泵浦源的光泵亚毫米波激光系统的密度矩阵方程的求解，获得光泵激光器的频率特性和增益特性。

We must point out that the study on the coherence of one three-level or four-level system is conducted in both the theory and experiments . It should be mentioned that the similar schemes and methods could generalized to the quantum dot systems .

特别要指出，对三能级系统以及四能级系统的相干性研究在理论和实验方面都备受关注，类似的方案与方法还可以被成功应用到量子点体系的相关讨论。

The subject of the work done mainly in the following areas : First of all , the atomic spontaneous emission , stimulated emission and stimulated absorption were analyzed in the light-emitting mechanism , the atomic transition of the three-level system and the four-level system models were established .

本课题所做的工作主要有以下几个方面：首先，从光的发光机理出发，分析了原子的自发辐射、受激辐射和受激吸收，建立了原子跃迁的三能级系统和四能级系统模型。

The prospect of all-solid-state lasers is forecasted . In the Chapter 2 , the basic model and work principle of LD-pumped all-solid-state lasers are induced . The oscillation threshold of four-level system , working slope efficiency and working point condition are deduced from rate equation theory .

第2章引入了LD泵浦固体激光器的基本模型和工作原理，从速率方程导出四能级系统的振荡阈值，工作斜效率和工作点情况，继而描述了三波耦合理论和腔内倍频非线性过程；

Study of Nonlinear Effect in Four-level Atomic System Based on Quantum Coherence

四能级系统中基于量子相干的非线性效应研究