光子

A theoretical scheme of generating high efficiency single photon using multi-dots delay detection in the process of SPDC is presented, by which the enhancement of the efficiency of controlled not gate is also studied.

二、提出了一种利用自发参量下转换过程采用多点延时探测触发的方法获得高效单光子源的方案，并基于它提高了实现受控非门的效率。

The research ofthis field is at the beginning in our country,and less than that in foreign country.There are no more experimental works on SPDC in our country.The other reason thatI want to devote myself into this field during my Ph.D.is to fulfill the blank in ourcountry and to catch up with the other country.

量子通信的实验研究在国内起步较晚，实验与国外的差距较大，利用双光子纠缠态的实验研究目前在国内基本上是一片空白，本人将该领域的研究作为博士论文研究课题，旨在填补国内空白，缩小差距。

The technique of SPECT was used to investigate the functional brain image of patients.

用单光子发射CT检查患儿的脑影像。

In the first part of the thesis, the quantitative analysis of myocardial perfusion imaging by SPECT and its clinical uses are first reviewed.

在本论文的第一部分，首先综述了国外心肌灌注单光子发射断层显像定量分析的研究与临床应用的现状。

Some classical applications and research progress are introduced, such as, selective amplification, frequency multiplication, up-conversion and signal generation in the terms of the gain spectrum as well as the carrier suppression and phase shift from the loss spectral point of view.

从受激布里渊散射增益谱的角度对微波光子信号的选择放大、倍频、上变频和信号产生以及从损耗谱的角度对信号载波抑制和信号相移等典型应用和研究进展进行了介绍。

The spectral property of the uniform fiber Bragg grating in the high-birefringence photonic crystal fiber are studied.

研究了具有高双折射的光子晶体光纤中均匀布拉格光栅的光谱特性。

The provided PCRR also satisfies the well-known relationship between free spectral range and ring radius R of traditional micro-strip ring resonators.

运用经典的微环自由光谱范围FSR和微环半径R的关系，证实新型的光子晶体微环腔也满足该关系。

The detector can realize imaging of very weak particle flow such as high-energy photons, electrons and ions flow, so it can be used for deep space exploration, spectral measurement, high-energy physics and bio-luminescence detection.

该探测器可以实现极微弱的高能光子、电子和离子等粒子流的成像探测，因此在深空探测、光谱测量、高能物理以及生物发光探测等方面将有重要的应用。

The effects of spatial distribution on the experimental results are studied in spectrally resolved two-beam coupling pump-probe technique.

在测量非线性折射率和双光子吸收系数的频率分辨双光束耦合抽运探测技术中，光场的空间分布没有得到考虑。

Ray laser is widely used in many fields such as, astronomy, microscopy, laser weapon, and spectrology because of its short wavelength and high energy in each photon.

x射线激光以其波长短，单光子能量高的特点广泛应用在很多的方面，例如天文学、显微镜、激光武器、光谱分析学等等。

I can not make it blossom and suits me

我不能让树为我开花

When temperatures are above approximately 80 °C discolouration of the raceways or rolling elements is a frequent feature.

当温度高于 80 °C 左右时，滚道或滚动元件褪色是很常见的特征。