Observation of Electromagnetically Induced Transparency by a Train of Short Pulses

We report the experimental demonstration of electromagnetically induced transparency in hot rubidium (^85Rb) atomic vapour by using an actively mode-locked external cavity diode laser in Littman-Metcalf configuration. We can make opaque resonant transitions transparent to any two optical comb components in the pulse trains which excite atomic coherence in the ground states of ^85Rb.     

两种求幂级数收敛半径方法不等价

一 由可以推出.证明如下:引理 若数列a_n(n=1,2,…)收敛,且a_n>0 则(证明略)命题　若a_n≠0 且 则.     

绝热条件下通常的脉冲序列和反直觉的脉冲序列对布居数转移和相干的影响

本文研究了绝热条件下，三能级Λ系统实现布居数转移和相干的两种方法，并比较了激光脉冲序列对布居数转移效率和相干的影响。运用自洽方程和密度矩阵方程，得出了相干控制量子态和布居数的数值模拟图。我们可以看到运用反直觉的脉冲序列比通常的脉冲序列在实现布居数转移和相干上更容易更优越。     

基于绝热快速通道控制原子布居数及其相干性的研究

本文在理论上研究了纳秒数量级内，运用绝热快速通道（ARP）来控制基态原子的相干性及 其布居数在不同能态间的转移.理论计算结果表明抽运激光脉冲相对斯托克斯（Stokes）脉 冲延迟时间的微小改变会导致原子相干性及其布居数的显著变化.运用密度矩阵方程和麦克 斯韦方程联合的自洽方程数值解，我们找到了实现原子最大相干性及其布居数在不同能态间 完全转移的条件. 关键词： 绝热快速通道 布居数 原子相干     

STUDY OF THE DOPPLER-FREE OPTICAL-OPTICAL TRIPLE-RESONANCE(DF-OOTR) SPECTROSCOPY AND ITS LINESHAPES

The Doppler-free optical-optical triple-resonance(DF-OOTR) spectroscopy and its line-shapes have been studied in detail theoretically and experimentally. The line center, linewidth and lineshape of an isolated DF-OOTR spectra component have been derived by using density matrix motion equation describing the interaction of a three-level system with three optical fields. The variations of the lineshape symmetry, the relative position and the strength of the Doppler-free Lorentzian dip to its background are comparable to the experimental traces varying with the relative intensities of the two mutual-saturating probe laser beams, as well as with the detuning of the first pumping laser from the intermediate level. The DF-OOTR technique shows a distinguished advantage especially in the labeling of the transitions and in the determination of absolute position of the upper level affected by perturbation shift, as these happened often in the dense molecular highly excited states.     

钠分子里德堡能级的无多普勒加宽光光三共振光谱以及能级宽度和谱线位移

首次报道了钠分子一系列里德堡能级的无多普勒加宽光光三共振（ＤＦ－ＯＯＴＲ）激发荧光光谱，测量了其谱线宽度和其谱线位置随温度、外加气体压力的变化情况。结果表明，钠分子里德堡能级（ｎ＝５～８）的自然宽度（含均匀加宽）在６０～１３０ＭＨｚ之间，其大小主要与主量子数ｎ有关。随钠原子浓度增大（温度升高），或外加Ａｒ气压力增大时，钢分子各个里德堡能级谱线均出现红移，数量在１００ＭＨｚ／τ之内，但位移速率大小不一。     

有限序列线性复杂度和的研究

本文对有限序列线性复杂度和的界、分布与期望进行了研究,得到一些新的结果。