这样，当光束继续在自由空间传输时，能保持其形状不变。
Thus, they can retain their shape unchanged upon further free-space propagation.
由于电信号传输系统保密性和抗干扰能力差，为此，利用声光晶体的衍射效应研制了一种光信号自由空间传输系统。
To resolve this problem, a free space transmission system for optical signals is developed on base of diffraction effect of acoustooptic crystal.
对其通过自由空间和付里叶变换系统特殊情况的传输作了分析和讨论。
Free space propagation and Fourier transfer system are also analyzed and discussed as particular cases.
为模拟电磁波在自由空间的传输状态，研制了用于生物医学工程研究的大型专用微波暗室。
To simulate transmission conditions of EM wave in free space, the biomedical microwave anechoic chamber used for biomedical engineering research was developed.
本论文对飞秒脉冲光束通过自由空间、线性色散介质和单透镜的传输特性作了深入研究。
The present thesis is devoted to studying the propagation of femtosecond pulsed beams in free space, linear dispersive media, and through lenses.
利用空间诱导色散概念，从理论上研究了等束腰宽度的类贝塞尔脉冲光束在自由空间中传输性质。
By using the concept of spatially induced group velocity dispersion, the propagation of Bessel-like pulsed beam which is constant beam waist in free space is studied.
根据得到的公式通过具体数值计算对脉冲贝塞尔光束在自由空间中的传输进行了研究。
Based on the formula, propagation properties of the beams in free space are studied through numerical calculations.
使用复解析信号法研究了束宽与频率无关的超短脉冲贝塞尔·高斯光束在自由空间的传输特性。
Using a complex analytical signal representation, the free-space propagation properties of ultrashort pulsed Bessel-Gauss beams whose waist width is independent of frequency are studied.
得到的孔径光阑限制下高斯光束的传输规律为高斯光束在自由空间光通信和光学超分辨中的应用提供了理论基础。
These propagation rules of Gaussian beam limited by the aperture could promote the applications of Gaussian beam in the optical communication and the optical super resolution.
基于部分相干光的传输定律，研究了多色高斯·谢尔模型光束在自由空间中传输的光谱变化。
Based on the propagation law of partially coherent light, spectral changes of a polychromatic Gaussian-Schell model beam propagating in free space is studied.
第三章利用了相干叠加原理，理论上对具有角向及径向分布的偏振态的光束列阵在自由空间的传输性质进行了研究。
In the third part, using the principle of coherence, we study the properties of the beam array with radial or azimuthal polarized propagating in the free space.
本文主要研究了带偏振的径向对称分布光束列阵在自由空间中的传输性质。
In this paper, we study the propagation properties of radial symmetry beam array with the polarized distribution in the free space.
接下来，将此传输方程与光在自由空间的传输方程相比较，引入了角谱轴向传输的等效距离公式。
Then, the effective distance expression of angular spectrum along optical axis has been introduced by comparing this equation with the free propagation equation.
为了更精确地漫射光在自由空间中的传输过程，我们提出一种通用的自由空间漫射光传输模型。
To model the photon transport process more accurately, a generalized free-space photon transport model is proposed.
利用这种方法不但能得到原子束在重力的影响下在自由空间中的传输矩阵，也可以得到原子束与脉冲的相互作用矩阵。
By use of this method, we can not only obtain the propagation matrix of atom beam in free space under the influence of gravity, but also obtain the interaction matrix of atom beam with and pulse.
还计算了自由空间的双环天线的输入阻抗，将结果和由单环的计算值经传输线变换而获得的结果作了对比。
The input impedances of the double-loop antenna in free space are also calculated, and the results obtained are compared with those from transmission line transformation of ca…
基于瑞利衍射积分公式，推导出非傍轴离轴高斯光束相干合成和非相干合成在自由空间中传输的解析公式。
Starting from the Collins formula, the properties of the off-axis Gaussian beam (OAGB) propagating through a paraxial ABCD optical system with an aperture are studied in detail.
基于瑞利衍射积分公式，推导出非傍轴离轴高斯光束相干合成和非相干合成在自由空间中传输的解析公式。
Starting from the Collins formula, the properties of the off-axis Gaussian beam (OAGB) propagating through a paraxial ABCD optical system with an aperture are studied in detail.
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