The state function for the interaction of a a - type three - level atom with two - mode squeezing vacuum field is derived in the paper . the influences of detuning 8 and initial squeezed light - field factor r on the cauchy - schwartz inequality , light squeezing and nonclassical properties are investigated 本文还导出了双模压缩真空场与型三能级原子非共振相互作用系统的态函数，研究了场模失谐量和场的初始压缩因子r对原子布居概率、光场压缩和非经典特性的影响。
After that , this paper briefly introduced the optical splitter ' s characteristics of amplication by calculate a uniformly widen three energy level ratio equation and transmission equation . since providing these theories and results , this paper began to discuss on the material characteristic and the whole craft process in short 然后，本文通过计算均匀加宽三能级结构的速率方程和传输方程，对光分路器的增益放大特性作出了一般的理论分析。在有了以上的理论计算和分析之后，本文概括地讨论了制作光分路器的材料特性和工艺过程。
The results show that : ( 1 ) in the system of f - type three - level atom interacting with the single - mode squeezed vacuum radiation field , the squeezing property of the light is dependent on the squeezing parameter r of the squeezed vacuum field and the detuning x of the f - type three - level atoms ; ( 2 ) in the system of f - type three - level atom interacting with the radiation field in binomial states , the squeezing property of the light is dependent on the detuning x of the f - type three - level atom and the parameters m , of the optical field 数值计算结果表明： ( 1 )单模压缩真空场与三能级原子相互作用过程中，光场的压缩效应与单模压缩真空场的压缩因子和三能级原子的失谐量相关联。 ( 2 )二项式态光场与三能级原子相互作用过程中，光场的压缩效应与三能级原子的失谐量和二项式态光场参数m 、相关联。
First the emission spectrum of an atom in a grey - body cavity is stuided . the influences of the incident field photon - number distribution , the cavity absorptivity and the system temperature on the atomic emission spectrum are discussed in detail . it is found that the influence of cavity radiation on the atomic emission spectrum could be reduced through diminishing the absorptivity of the cavity and lowering the temperature of the cavity 我们首先研究了灰体腔中二能级原子和型三能级原子的发射谱，详细讨论了入射场光子数分布、腔体吸收系数以及系统温度对原子发射谱的影响，指出在实验上可以通过减小腔体吸收系数、降低系统温度来减小腔体辐射对原子发射谱的影响。
We clarified that if the three - level atom and the two - mode cavity field are all in the coherent superposition state , the different transition processes interfere each other , the emission spectrum exhibits phase sensitivity . second , the phase properties of the two - mode su ( 2 ) coherent field interacting with a - type three - level atom and the two - mode su ( 1 , 1 ) coherent field interacting with two atoms are investigated 我们考察了双模su ( 2 )相干场与型三能级原子相互作用系统以及双模su ( 1 ， 1 )相干场与双原子相互作用系统中双模光场的相位性质，证明了光场每个j迄凶博士学位论文docioraldisser ” i人lion
In this paper , we prove that for a three - level atom in a circularly polarized electromagnetic wave , there is a coherent superposed state of its two states such that when the atom is initially in the state , under the zero - order approximation , the atom is always in the state hereafter , while the occupation probabilities that the atom is in other states are zero ; under the first - order approximation , the atom is nearly in the state , while the occupation probabilities that the atom is in other states near zero 本文证明：对圆极化光中的三能级原子，存在着由它其中的两个态构造的一个特殊的相干叠加态，当原子最初处于这个态时，它以后将总是几乎处于这个态，而原子处于其他态的概率接近于零。
It is derived the hamiltonian for the interaction of a - type three - level atom with a two - mode quantum cavity field from the general interaction hamiltonian between a multi - level atom and a multi - mode radiation field , and reduce it into an effective two - mode raman - coupled mode under large detuning condition . it is proposed a modified effective hamiltonian for the two - mode raman - coupled model . it is found the time - dependent state vectors and present validity conditions for the involved interaction hamiltonians . it is shown that in the study of the two - mode raman - coupled model it is not enough to retain only the usually used effective hamiltonian , one must also take into account the ac stark shift of the atomic levels ( at least one of the levels ) . finally , it is studied the atomic dynamics in the interaction of a - type three - level atom with a two - mode quantum cavity field and in the two - mode raman - coupled model . it is found that the number of collapse - revivals , the collapse time and the revival time show new characteristics 从多能级原子与多模光场的相互作用哈密顿量出发，导出了型三能级原子与双模光场的相互作用哈密顿量.在大失谐条件下将其化成等效的二能级形式双模喇曼耦合模型.提出了该模型的一个改进型等效哈密顿量.该哈密顿量由两部分构成：一部为通常所谓的等效哈密顿量，另一部分描述原子能级的动态斯塔克移动.研究表明，在双模喇曼耦合模型的研究中，只考虑前者是不够的，还必须考虑后者.最后，我们研究了该系统中原子的动力学行为，发现崩塌-复苏的数目、崩塌时间和复苏时间均呈现新的特性
Under an appropriate condition , the squeezed vacuum field can trap the two atoms in ri ) . an analytical expression of emission spectrum for three - level atom interacted with two - mode cavity field is given . the effects of the initial state of system on the emission spectrum for three - level atom are explored 我们给出了好腔中与双模腔场相互作用的三能级原子发射谱的一般表达式，探讨了系统初态对三能级原子发射谱的影响，阐明了只有原子和双模驱动场初始时刻均处于相干叠加态，原子不同跃迁通道间的量子干涉才使得原子发射谱呈现相位敏感性。
The analyses given in this paper to quasi - three - level for 946 nm laser are complete . the relation between 946 nm laser transmission and optimal crystal length has been derived from the rate equations describing the population inversion and the photon density in the laser cavity in the steady - state case . the minimal claims to coating have been given on the base of contrasting 946 nm transmission with 1064 nm transmission in the condition of different cavity losses and how the pump beam radius in the laser crystal and optimal crystal length affect the laser threshold and output power of 946 nm laser has been given as well 对产生946nm谱线的准三能级结构给出了较为完整的分析，利用激光谐振腔处于稳态时的速率方程，导出了准三能级nd ： yag946nm起振时，透射损耗与最佳激光晶体长度的关系，在与1064nm透射损耗相比较的基础上，给出了不同的腔损耗情况下的最低镀膜要求，并且给出了激光阈值、输出功率和最佳激光晶体长度及泵光光斑大小的关系，这为设计室温下高效运转的946nm激光器的提供了理论基础，这种分析方法对研究此类低增益，准三能级或三能级激光系统输出特性有借鉴意义。
The optical bloch equation of a v - type three - level atom embedded in dielectrics is derived . because of the vacuum anisotropy induced by the presence of the dielectrics , quantum interference between the two decay channels can still be generated in spite of the two dipole moments of the atom are orthogonal to each other 推导了介质中一个v型三能级原子的光学bloch方程，由于介质所诱导的真空的各向异性，即使此v型三能级原子的两电偶极矩互相垂直，依然能够产生量子干涉。
