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1.
根据量子力学的叠加原理 ,构造了由多模复共轭相干态光场 | {Z(a) j }〉q 和 | {Z(b )j }〉q 叠加而成的非对称两态叠加多模叠加态光场 |Ψ〉q。利用多模压缩态理论 ,研究了态 |Ψ〉q 的等阶N方Y压缩 ,结果表明 :当满足一定相位条件时 ,无论N为奇数还是偶数 ,态 |Ψ〉q 的两个正交相位分量周期性地呈现任意阶等阶N方Y压缩效应。  相似文献   

2.
利用多模压缩态理论,研究了由多模复共轭相干态|{Z*j}>q、多模复共轭虚相干态|{iZ*j}>q和多模真空态|{0j}>q这三者的线性叠加所组成的第Ⅲ类三态叠加多模叠加态光场|ψ(3)3>q中广义电场分量的等幂次N次方Y压缩特性.发现在一定条件下,|ψ(3)3>q的广义电场分量总是呈现出周期性变化的、任意偶数次的广义非线性等幂次N次方Y压缩效应.  相似文献   

3.
利用多模压缩态理论,研究了由多模复共轭相干态|{Z*j}>q、多模复共轭虚相干态|{iZ*j}>q和多模真空态|{0j}>q这三者的线性叠加所组成的第Ⅲ类三态叠加多模叠加态光场|ψ(3)3>q中广义电场分量的等幂次N次方Y压缩特性.发现在一定条件下,|ψ(3)3>q的广义电场分量总是呈现出周期性变化的、任意偶数次的广义非线性等幂次N次方Y压缩效应.  相似文献   

4.
光场迭加态的振幅N次方压缩   总被引:5,自引:0,他引:5  
本文根据Zhang等人定义的高阶压缩,研究了光场迭加态|ψ>=a|0>+β|z>的高阶压缩特性,发现这种光场迭加态可存在任意阶的振幅N次方压缩。  相似文献   

5.
构造了由多模泛函相干态|{fj(xj,yj,zj)}〉q、多模泛函相干态的相反态|{-fj(xj,yj,zj)}〉q、多模复共轭泛函相干态|{f j(xj,yj,zj)}〉q四态线性叠j(xj,yj,zj)}〉q和多模复共轭泛函相干态的相反态|{-f 加组成的四态叠加多模泛函叠加态光场|Ψ(4)(fj)〉q。利用多模压缩态理论,研究了态|Ψ(4)(fj)〉q的广义非线性等幂偶次Y压缩特性。结果表明:在一定条件下,态|Ψ(4)(fj)〉q可呈现出任意偶数次的广义非线性等幂次2p(p=1,2,…)次方Y压缩效应;光场经典强度的空间分布函数|fj(xj,yj,zj)|2(j=1,2,…,q),对态|Ψ(4)(fj)〉q的等幂偶次Y压缩效应的压缩程度、压缩深度和压缩幅度等产生直接影响。  相似文献   

6.
增加光子双模压缩真空态的N次方H压缩效应   总被引:5,自引:0,他引:5  
通过数值计算,研究了增加光子双模压缩真空态的N次方H压缩效应。结果表明:对于态,光场存在着N次方H压缩效应,而且对于高次方H压缩,在压缩参数较大时,随着场模上光子增加数的增大,N次方H压缩效应增强。  相似文献   

7.
构造了(N 1)维希尔伯特空间多模复共轭相干态|{iZ*j}>2q、多模复共轭虚相干态|{iZ*j}>2q|及多模真空态|{0j}>2q这三态线性叠加而成的多模纠缠态|Ψ(3)>2q.利用多模压缩态理论,研究了态|Ψ(3)>2q的广义非线性等幂次N次方差压缩特性.结果表明:在有限维(N 1)希尔伯特空间,一些条件下,态|Ψ(3)>2q的第一或第二正交相位分量分别存在广义非线性等幂次N次方差压缩效应;而另外一些条件下,态|Ψ(3)>2q,的两个正交相位分量却同时存在等幂次N次方差压缩效应;其压缩程度不同于无限维希尔伯特空间下的结果,称其为"双边差压缩"现象.  相似文献   

8.
四态叠加多模叠加态光场的等幂N次方X压缩   总被引:5,自引:0,他引:5  
利用多模压缩态理论,研究了新构造的第I种偶数模四态叠加多模叠加态光场│Ψoe^(4),│>2e的等幂次N次方X(差)压缩特性。结果表明,当场模数q与压缩幂次N的乘积qN为偶数且任一模光子数nj小于压缩幂次N时,态│Ψoe^(4),│>2q的2个正交相位分量可同时呈现程度相同的等幂次N次方X压缩效应;当qN为奇数且mj<N,则在其它必要条件下,态│Ψoe^(4),│>2q的2个正交相位分量可分别呈现等幂次N次方X压缩效应。  相似文献   

9.
第Ⅲ类3态叠加多模叠加态光场不等幂次Y压缩   总被引:19,自引:2,他引:17  
构造了由多模轭相干态、多模复共轭虚相干态及模真空态3态线性叠加所组成的第Ⅲ类3态叠加多模叠加态光场。利用多模压缩态理论,研究了此量子态的广义非线性不等幂次Nj次方Y压缩(即振幅压缩)效应。结果发现,只有当各单模的压缩次数Nj(j=1,2……,q)为偶数时,此量子态在一定的条件下总可呈现出周期性变化的任意偶数次广义非线性不等幂次Nj次方Y压缩效应。  相似文献   

10.
利用多模压缩态理论 ,研究了由多模泛函相干态 |{fj(x ,y ,z) }>q 及其相反态 |{-fj(x ,y ,z) }>q 的线性叠加所组成两态叠加多模叠加态光场 |Ψ( 2 )(f) >q ,的广义电场分量的不等幂次Nj 次方H压缩特性。结果发现 :当各模的压缩次数Nj 之和为奇数时 ,态 |Ψ( 2 )(f) >q在一定条件下可呈现出周期性变化的、广义非线性不等幂次Nj 次方H压缩效应  相似文献   

11.
构造了由多模复共轭相干态|{zj(a)*})q和多模虚共轭相干态|{izj(b)*})q两者的线性叠加组成的非对称两态叠加多模量子叠加态|{ψ)q.利用多模压缩态理论,研究了该态的等幂偶数次方Y压缩效应,结果表明:压缩次数N为偶数,即N=2p(p=1,2,3……),并且各个模的初始相位ψf、态|{zj(a)*})q和态|{izj(b)*})q的初始相位差θpq(R)-θnq(I)及其中等序号的各个模的振幅之积Rj(a)Rj(b)的和∑j=1 q [Rj(a)Rj(b)]组成的混合相位θpq(R)-θnq(I)-∑j=1 q [Rj(a)Rj(b)]分别满足一定的条件时,不论p为奇数还是偶数,态|ψ)q的两个正交相位分量交替呈现出周期性变化的等幂偶数次Y压缩效应,p为奇数时的压缩深度大于p为偶数时的压缩深度,这一结果是对称两态叠加多模叠加态所不具有的.  相似文献   

12.
The effect of residual stress and the sidewall emission in InGaN–GaN films with different thickness of sapphire substrate were investigated. The peak wavelength of electroluminescence was blue-shifted as thinning the sapphire substrate, because the wafer bowing-induced mechanical stress alters the piezoelectric field in the InGaN–GaN multiple quantum-well active region of the light-emitting diode (LED). A sideview LED with 170-$muhbox{m}$ -thick sapphire exhibited the highest output power of 14.04 mW at a forward current of 20 mA, improved by 7% compared to that with 80-$muhbox{m}$-thick sapphire. The maximum output power can be obtained by considering both the photon escaping probability from the edges of the sapphire and the photon absorption probability in the sapphire as well as the residual mechanical stress induced by the wafer bowing.   相似文献   

13.
This paper describes some of the key issues associated with the patterning of metal electrodes of sub-micron (especially at the critical dimension (CD) of 0.15 μm) dynamic random access memory devices. Due to reactive ion etching lag, the Pt etch rate decreased drastically below the CD of 0.20 μm and thus K-th storage node electrode with the CD of 0.15 μm could not be fabricated using the Pt electrodes. Accordingly, we have proposed novel techniques to surmountly-the above difficulties. The Ru electrode cannot for the stack-type structure is introduced and alternative multischemes based on the introduction of the concave-type selfstructure upto using semi-Pt or Ru as an electrode material are outlined respectively.  相似文献   

14.
A repetitivelyQ-switched Nd:YAG laser was used to produce "eye-safe" radiation near 1.55 μm by stimulated Raman scattering in acetonitrile and in methane with photon conversion efficiencies of 14 percent and 22 percent, respectively. The laser and Stokes beams were mixed in lithium niobate to obtain 6-kW peak power pulses at the difference frequency near 3.4 μm with a photon conversion efficiency of 1.1 percent.  相似文献   

15.
Time-dependent rate equations for the populations of a three-level molecular system are derived from the density matrix in the limit, in which the dephasing time is shorter than any relevant time scale, and the cross relaxation (dephasing) times are faster than the time scale characterizing changes in the envelope of the pumping field. These equations reduce to results obtained by other authors when non-linear two photon effects and power broadening are neglected.  相似文献   

16.
The performance characteristics of 1.5-μm external cavity semiconductor lasers have been investigated. Measurements of phase, frequency, and amplitude stability are presented together with the power and threshold characteristics. Amplitude shift keyed coherent receiver sensitivity measurements gave a receiver sensitivity of -55.7 dBm at 150 Mbit/s equivalent to 137 photon/bit as compared to previous amplitude shift keying results of 520 photon/bit and the shot-noise limit of 36 photon/bit.  相似文献   

17.
We have investigated the properties of InP-based microcavity light-emitting diodes (λ=1.6 μm). Our objective was mainly to study the effects of lateral confinement of optical modes, which was achieved by the wet oxidation of double In0.52Al0.48 As layers. The smallest devices had a cavity radius of 0.5 μm, which becomes comparable to λ/n, where n is the effective refractive index of the photon emitting heterostructure. Two types of devices were tested: the first without any mirrors in the vertical direction, and the second with a combination of MgF/ZnSe DBR (top) and silver (bottom) to produce a low Q~35-45. The latter type of devices exhibited higher output power and narrower spectral linewidth; otherwise, the characteristics were very similar The output slope efficiency monotonically decreases with reduction of lateral cavity size up to ~2-μm in diameter and then is enhanced again for smaller cavity sizes. The slope efficiency of the smallest device (aperture diameter 1 μm) is almost equal to that measured for the largest devices. The maximum output power measured from the devices is 30 μW. The far-field pattern of devices with aperture radii ranging from 1.5 to 20 μm shows an angular width (FWHM) of 50°. On the other hand, devices with smaller aperture (radius ~0.5 μm) exhibit an angular width of 20°. The measured small-signal modulation bandwidth increases from ~0.45 GHz for the larger devices to 0.8 GHz for the smallest devices. Our results indicate that microcavity effects can be observed with only lateral photon confinement, making device fabrication requirements less stringent compared to surface-emitting lasers  相似文献   

18.
研究了一个型三能级运动原子与单模场相互作用系统中光子的反聚束效应,着重讨论了不同初始态下,原子运动速度和模场结构与强度对光子反聚束效应的影响.  相似文献   

19.
报道了利用1.313μm波长调Q锁模Nd3+:YLF激光泵浦国产掺铒石英光纤同时产生可见光463nm(463nm,475nm,485nm,494nm,501nm,510nm),525nm,540nm(525~564nm),二次谐波信号656nm(656~675nm)和近红外804nm(784~820nm)等波段放大自发辐射的实验结果.在可见光463nm波段,在高泵浦功率下观察到随泵浦光功率增大,邻近几个中心波长与463nm波长信号产生类似级联共振放大增强的现象。同时发现几个中心波长辐射光谱宽度随泵浦光功率增加有加宽的关系,这与现有实验结果报道不一致。实验中还发现3m长光纤与4.5m长光纤在输出可见光自发辐射光谱方面有很大的不同.3m光纤在相等泵浦光功率下.出现邻近波长共振放大加强的几率比4.5m光纤小得多。根据能级跃迁关系提出了共振四光子吸收将基态4I15/2离子抽运到高能态2G7/2,然后跃迁辐射回到4I13/2态的机制,给出了实验结果的初步机理解释。  相似文献   

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