光子数

X射线管电压为20～120kV，转换屏厚度范围为200～400μm。结果表明，随着X射线管电压的升高，背向散射光子数增加，其平均能量也迅速增加；

The potential producing bremsstrahlung X rays is 20 ~ 120 kV . Results show that with the increase of X ray tube potential the number of backscattered photons gets bigger and their mean energies increase rapidly .

同时，在理论上找到了纠缠相干态的最优的Bell算符，在平均光子数较大的情况下，违背值将为一个恒定的常数2~（1／2）。

Meanwhile , when we find the optimal Bell operator of entangle coherent state , the violation will reach a constant 2 21 / 2 when the mean number of photons is large .

初始平均光子数N愈大，能达到的最大压缩愈强。

And the larger the N is , the stronger the achievable squeezing will be .

利用Raman过程对光子数进行量子非破坏性测量

Quantum Nondemolition Measurement of Photon Number through Raman Process

研究发现随着平均光子数n-值、原子-光场耦合系数g值的增大，光子由表现明显的反聚束效应和聚束效应交替变换状态逐渐转到表现聚束效应状态。

With the increasing of the values of and g , the character of photons varies from alternation between anti-bunching effect and bunching to bunching only .

本文利用形变的qs－Languerre多项式研究了光子数增加的qs－相干态的量子统计特性，并用数值计算方法研究了形变参数q和s对光子数增加的qs－相干态的非经典特性的影响

In this paper , the quantum statistical properties of the photon added qs

讨论了初始场的平均光子数n（初始场强）、原子-光场的耦合系数λ和光场频率ω对粒子布居几率的影响；

The influence of the initial mean photon number n of field , of the atom-field coupling sonstant λ and of the light frequency ω on the atomic population is also discussed .

通过数值模拟给出了有损耗情形注入率r与腔损耗系数c之间应满足的阈值条件，并讨论了不同腔损耗对稳态光子数分布和平均光子数的影响。

By numerical simulation we calculate the threshold satisfied by pumping rate r and damping c , and discuss the influence of cavity loss on the steady photon distribution and the mean photon number .

目前观测到的重子光子数比10~（-9）可能是由极早期宇宙中的超重玻色子的衰变产生的，在这种衰变中C及CP是破坏的。

The observed baryon-to-photon ratio of 10-9 could be produced by the decays of superheavy bosons in the very early universe if C and CP are violated in its actions .

利用MonteCarlo方法模拟计算了该系统的测量精度，结果表明，在90%的光子数探测几率下，多普勒测量精度约是单个CCD探测通道谱宽的10%；

The simulation with the Monte-Carlo method shows that the accuracy of Doppler measurement is better than a tenth of the spectral width of a single CCD component in 90 % detection probability .

采用数值计算的方法，详细讨论了光场参量和Kerr效应对原子布居反转和平均光子数的影响。

By numerical method , the influences of field parameters and Kerr effect on the atomic population inverse and average photon number are discussed detailedly .

在激光场的光子数不太高时导出一个普适的激光场vanderpol运动方程。

We derive an equation of motion for laser field in the type of Van der Pol equation when the photon number of the laser field is not too high .

研究了V型三能级原子BEC与双模压缩光场相互作用系统中，忽略原子间相互作用和考虑原子间相互作用时光场的正交压缩和光子数压缩。

When neglecting and considering the interaction between atoms , the quadrature squeezing and the photon-number squeezing of Bose-Einstein Condensate of V-type three level atoms interacting with two-mode squeezed light field are studied .

一组有限固溶的Fe-Cu合金的康普顿散射实验说明，随着Cu含量的增加，康普顿散射光子数并无明显的变化。

The Compton scattering experiments of Fe-Cu finite solid solutions , show that there is no obvious change of the Compton scattering photon counts with the Cu content increasing in the Fe-Cu alloy .

最后，本文还研究了Kerr介质中初始处于压缩相干态的单模场与V型三能级原子相互作用系统的平均光子数<（？）

Finally , the evolution vs. time of the mean photon number and the Mandel factor Q ( t ) in the system of the single-mode squeezed coherent-state interacting with a V-type three-level atom in the Kerr medium are studied .

考虑腔内光子数密度的高斯空间分布以及抽运光的空间分布，给出了描述调Q激光器工作原理的耦合速率方程组，其数值解与实验结果相符。

A rate equation model is introduced , in which the intracavity photon density is assumed to be Gaussian spatial distribution and the pump beam spatial distribution is also considered . The numerical calculations of the rate equations are consistent with the experimental results .

详细研究了压缩光子数态（SNS）的振幅平方压缩性质，导出了振幅N次幂的压缩条件，得到了振幅N次幂压缩的一般性结论。

Abstract in this paper , amplitude-squared squeezing properties of squeezed number states ( SNS ) are studied in detail . Amplitude Nib-power squeezing conditions are derived and the general conclusions for amplitude Nib-power squeezing properties are obtained . Keyworks : squeezed number states ( SNS );

Ck态时，随着时间的演化，电子的儿率密度呈现分叉现象，相应的光子数分布是时间周期函数，这是由于电子与光场之间有能量交换。在这种情况下，系统是封闭的。

If the initial photon state is a Fock state , the probability density of the electron exhibits bifurcation and confluence and the corresponding photon distribution is a time-periodic function which result from the energy exchange between the electron and field .

在两段式DFB激光器的输出特性研究方面，利用边界条件以及两段之间的连续条件，导出了两段平均光子数密度之间的依赖关系；

In the aspect of output characteristics , after applying the boundary conditions and the continue condition of two segments , the correlative dependence of average photon density in each segment has been obtained .

研究了与灰体辐射场相互作用的J-C模型中场的线性熵的演化规律，讨论了腔体吸收系数、入射场的光子数分布、热场的平均光子数对场的线性熵的影响。

The evolutional rules of linear entropy of field in the model of Jaynes-Cumming ( JC ) that acts each other with radiation field of a grey body are studied .

首次得出了考虑基频光光子数密度、拉曼光光子数密度空间分布以及晶体热效应的主动调Q内腔式拉曼激光器的速率方程。该速率方程能更好的描述拉曼激光器的输出特性。

In the rate equations for the intracavity Q-switched Raman lasers , the intracavity fundamental photon density , Raman photon density and the initial population-inversion density of the gain medium are assumed to be Gaussian spatial distributions , and the thermal effect of the laser medium is considered .

考虑腔内光子数密度的空间高斯分布以及晶体热效应的影响，给出了LD泵浦Nd∶GdVO4晶体Cr4+∶YAG被动调Q1.06μm激光的耦合速率方程组。

By considering the Gaussian spatial distribution of the intracavity photon density and the thermal effect in the gain medium , the coupled rate equations of a LD-pumped passively Q-switched Nd ∶ GdVO_4 laser at 1.06 μ m with Cr 4 + ∶ YAG are given .

我们采用光子数可分辨探测技术，直接探测回波光子数，实现了基于多像素光子计数器（MPPC）的激光测距系统。

We introduced the photon-number resolving detection technology and realized a laser ranging system based on multi-pixel photon counter ( MPPC ) .

当外部光反馈处于中度反馈时，当调制深度取不同值时，ECSL的光子数呈现单周期、多周期甚至混沌现象。

When the external optical feedback is intermediate , the peak photon number of the ECSL behaves single period , multi-period or chaos for different modulation index .

实验结果显示：当探测光子数接近2000时，激光雷达测速的精度为0.6m/s。

Lidar experimental results show that an accuracy of ( 0.6 m / s ) can be obtained for 2000 detected photons .

结合和频转换效率方程，模拟计算了单／双LBO晶体和频过程的最佳光子数配比、基频光光束发散角、LBO晶体中走离角对LBO晶体长度以及和频转换效率的影响。

Conversion efficiency equations of sum-frequency were combined , the relationship between single / double LBO optimal photon number ratio , fundamental laser beam divergence and walk-off angle with optimal crystal length and sum-frequency conversion efficiency were simulated in the process of sum-frequency .

结果表明，弱相干泵浦时可获得最佳压缩效应，相应的Fano因数为0.16。这种产生光子数压缩态的方法在实验上是简便可行的。

We find that the optimum squeezing effect of photon-number occurs in the situation of weak coherent pumping and the corresponding Fano factor is 0.16 . This method of generating photon-number squeezed state is convenient and practical in experiment .

运用密度算符方法，讨论了该模型原子能级算符光子数分布、平均光子数等性质，比较了该模型与标准JC模型结果的区别。

By means of the method of density matrix , the properties of the average values of the atomic level operator , the average photon number , the distribution of the photon number of the JCM are discussed and this JCM is compared with the usual JCM .

在短时近似下，我们证明，Loschmidt回波恰好是光场缀饰原子系综中光子数涨落的指数函数。

For a short time approximation , we prove that the LE is just an exponential function of the photon number variance in the photon-dressed atomic ensemble .

实验发现，当激光的激励强度大于1023光子数／cm2s时，乙醛水溶液的相对荧光效率渐趋饱和。

The experiment was found , the relative fluorescence efficiency of Acetaldehyde water solution is gradual saturated when the excitative intensity > 10 23 photons / cm 2 · s.