共查询到20条相似文献,搜索用时 46 毫秒
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数值求解了光子晶体光纤中的去极化型声波导布里渊散射色散方程,研究了光子晶体光纤中的布里渊频移随泵浦波长及空气孔填充率的变化关系,以及去极化型声波导布里渊散射频移随温度、应变、声波导模式、纤芯直径及空气孔层数的关系。结果表明:布里渊频移随着波长的增大而线性减小。对于相同的波长点,增大光子晶体光纤空气孔填充率时,声波横向速度将会减小。去极化型声波导布里渊散射频移随温度及应变的增大而线性增加。同一温度条件下,高阶TR2m模式的去极化型声波导布里渊散射频移对温度的变化更为敏感;而在同一应变条件下,低阶TR2m模式的去极化型声波导布里渊散射频移对应变的变化更为敏感。去极化型声波导布里渊散射频移随纤芯直径的增加而增大,随空气孔层数的增加而减小。 相似文献
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多模光纤不同模式布里渊散射参数 总被引:1,自引:0,他引:1
基于射线光学和波动光学理论分析了多模光纤的布里渊散射特性,提出了确定布里渊散射角取值范围的方法;推导了阶跃型和渐变型多模光纤不同模式群布里渊频移、线宽、散射谱和散射功率的表达式.结果表明,阶跃型和渐变型多模光纤布里渊散射角的最大取值范围为全反射临界角的2倍到π;阶跃型光纤的布里渊频移、线宽、归一化峰值增益和散射功率随模式群的变化比渐变型光纤缓慢,且随着模式群编号的增加,阶跃型光纤的上述参量分别在11.084~10.932GHz、21.760~21.168 MHz、1~0.933和1.990×10-9~1.857×10-9 W范围内呈曲线下降;渐变型光纤的上述参量分别在11.064~10.969GHz、21.683~21.314MHz、1~0.957和2.052×10-9~1.965×10-9 W范围内呈直线下降. 相似文献
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利用全矢量有限元法模拟了单模光纤中声波导布里渊散射R0,m和TR2,m声波模式对斯托克斯波增益、相位调制和双折射的影响.研究结果表明:当布里渊频移与R0,8和TR2,10声波频率相同时,斯托克斯波的增益最大,且增益随泵浦功率的增大而增大;R0,1、TR2,1、TR2,5、TR2,7和TR2,10声波模式对斯托克斯波相位调制较大,且相位调制随泵浦功率的增大呈线性增大,其中TR2,m模对斯托克斯波相位调制比R0,m模大;TR2,1、TR2,5、TR2,7、TR2,10声波模式对斯托克斯波产生较为明显的附加双折射,且附加双折射程度随着泵浦功率的增加呈线性增大. 相似文献
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激光布里渊散射是由介质密度涨落引起的一种非弹性散射现象,其散射谱特征参数(频移、线宽)取决于散射角和散射介质压强、温度等参数,通过探测高速气流激光布里渊散射谱,可反演获得高速气流压强、温度等参数。介绍了基于激光布里渊散射原理的高速气流参数测试原理,设计了一种基于法布里 珀罗干涉仪的高速气流参数测试装置,搭建实验平台获取了高速氮气气流的激光布里渊散射谱。实验结果表明,通过激光布里渊散射谱获得的高速气流压强、温度值与理论值相对误差在15%以内。 相似文献
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András Vasy 《Communications in Mathematical Physics》1999,200(1):105-124
In this paper we show that generalized eigenfunctions of many-body Hamiltonians H with short-range two-body interactions have distributional asymptotics at non-threshold channels. The leading terms of the
asymptotics can be used to define a scattering matrix, and we show that this is the same (up to normalization) as that arising
from the standard wave-operator approach. We also prove the existence of local distributional asymptotics for locally approximate
generalized eigenfunctions in the more general setting of short range perturbations of a scattering metric, defined by Melrose
in [13].
Received: 29 October 1997 / Accepted: 19 June 1998 相似文献
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R. Anderson 《Optics & Laser Technology》1993,25(4)
A technique is proposed to measure the components of the 2 x 2 scattering matrix of a target. Both relative amplitudes and phase are measured. Absolute amplitudes require irradiance measurements involving a reference scatterer to calibrate the incidence irradiance. 相似文献
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We reanalyze the procedure used thus far for the study of collision processes in the Chiral Bag Model from the point of view of scattering theory. In the present formalism thein andout states are free waves with no memory of the cavity. This feature gives rise to an observable effect consisting in a peculiar momentum dependence of the scattering amplitudes, which differs from that of previous calculations. The new procedure however does not change the magnitude of the pion-baryon coupling constants. 相似文献
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It is shown that the Chou-Yang model can be extended to hyperon-neutron elastic reactions at high energies by assuming that the hadronic form factor of neutron is proportional to its magnetic form factor. It is also predicted that the scaling of magnetic form factor of neutron with charge as well as magnetic form factors of proton implies that the differential cross sections of corresponding hyperon-proton and hyperon-neutron reactions should be equal. 相似文献
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A. I. Smirnov 《Russian Physics Journal》2003,46(10):1066-1067
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The spectral and angular distributions for the Compton effect in a constant electro-magnetic field are obtained. The possibility of the existence of the induced Compton scattering in an external field (i.e. two-photon emission, one of the two photons being induced by the incident wave) is demonstrated. In the case of a constant magnetic field the deviation from the Klein-Nishina formula of the obtained distribution for the Compton effect as well as the behaviour of the distribution for the induced Compton effect are discussed. The optimal region of the parameters for the possible experimental test of these effects is given. 相似文献