缀饰原子系统中双光子共振非简并四波混频

本文研究了缀饰原子系统中的双光子共振非简并四波混频.理论上我们研究了多普勒增宽的四能级系统中耦合光场对双光子共振非简并四波混频的影响,发现加入强耦合场后,非简并四波混频频谱出现Autler-Townes分裂;在不同双光子共振失谐时,由于量子干涉双光子共振非简并四波混频的信号能够被抑制或增强.实验上我们在Ba原子蒸汽中,通过引入基态6s2和自电离里德堡态6pnd之间的原子相干证实了该现象.本方法提供了一种不仅可以测得共振频率和横向弛豫,而且可以测得两个高激发原子态之间的跃迁的偶极矩阵元的新的光谱学工具.     

用位相共轭超快调制光谱方法提高能级测量精度

用位相共轭超快调制光谱方法提高能级测量精度米辛，俞祖和，姜谦，李晓峰，傅盘铭（中国科学院物理研究所光物理实验室北京１０００８０）传统的量子拍频光谱测量能级分裂的技术，如时间分辨四波混频和光子回波方法中，均需要激光脉冲具有较大的光谱宽度，即大于能级分裂...     

激光感生双光栅中频谱分辨率的研究

研究了用于测量两束光频差的时间延迟激光感生双光栅的频谱分辨率，确定了当泵浦光具有高斯线型时四波混频信号的产生条件，此条件通过在可调谐的窄带激光和宽带激光间的拍频实验得到证实。     

Field—Correlation Effects on Rayleigh—Enhanced Nondegenerate Four—Wave Mixing

We study Rayleigh-enhanced nondegenerate four-wave mixing (NFWM) with time-delayed,correlated fluctuating fields.The importance of the field correlation is revealed in the Rayleigh-enhanced NFWM spectrum when the time delay is varied.The Rayleigh-enhanced NFWM is employed to study the ultrafast processes in the frequency domain.A relaxation time as short as 220 fs was deduced in the Rayleigh-enhanced NFWM experiments in carbon disulphide.     

Atomic coherence in nondegenerate four-wave mixing

Two-photon resonant nondegenerate four-wave mixing (NFWM) with the addition of a coupling field in Ba atomic vapour has been studied. We find that coherence of the atomic level transitions leads to suppression of the NFWM signal, giving rise to a dip with a linewidth that is linearly proportional to the intensity of the coupling field.     

染料分子电子激发态振动失相过程的非相干光时延四波混频研究

本文对噁嗪(Oxagine)、甲酚紫(cresyl violet)染料分子的吸收带和吸收边进行了非相干光时延四波混频(TDFWM-IL)的详细研究,得到了有关失相参量的数据,并利用非相干光时延四渡混频的多能理论解释了实验结果和失相参量的物理意义。     

Suppression and Enhancement in Parametric Two-Photon Resonant Nondegenerate Four-Wave Mixing via Quantum Interference

Quantum interference may lead to suppression and enhancement of the two-photon resonant nondegenerate fourwave mixing signal in a cascade four-level system.Such phenomena are demonstrated in Ba through inducing atomic coherence between the ground state 6s^2 and the doubly excited autoionizing Rydberg state 6trod.This method can be used as a new spectroscopic tool for measuring the transition dipole moment between two highly excited atomic states.     

用级联三能级超快调制光谱学研究双光子跃迁的色散和吸收

传统的高分辨激光光谱学可分为频率域和时间域两大类．其中，量子拍频是在时间城恻量原子能级分裂的有效手段．它表现为信号随时间变化而产生调制．传统的量子拍频出现在时间分辨荧光，时间延迟四波混频和光子回波等现象中．它们的共同特点是时间分辨率由入射激光的脉宽来决定．近年来，我们发展了一种新的高分辨激光光谱学方法，即位相共轭超快调制光谱学（PCUMS）．与传统量子拍频比较，PCUMS的特点是时间分辨率不受激光脉宽的限制．例如我们曾用5ns的激光观测到对应于销原子5S和4D能级分裂25fs的调制信号．其次，通过理论分析，用P…     

Three-Photon Resonant Six-Wave Mixing with Phase-Conjugation Geometry in Na Atomic Vapour

We report a three-photon resonant six-wave mixing (SWM) with phase- conjugation geometry. It has advantages that phase matching condition is not critical and the generation of SWM signal is efficient. This technique provides a new spectroscopic tool for studying the highly excited atomic or molecular states with high resolution. The feasibility of this technique is demonstrated in sodium vapour.     

宽带激光之间拍频的观测

宽带激光之间拍频的观测米辛，俞祖和，姜谦，傅盘铭（中国科学院物理研究所，北京１０００８０）最近我们完成的时延激光感生双光栅实验（ＴＤＬＩＤＧ），研究两个非相干光源之间的拍频，通过信号强度与含两个频率成分光场的相关函数解释了四波混频（ＦＷＭ）信号强度的...