双折射

A semiconductor optical amplifier model is employed in which the self birefringence of SOA due to stress is taken into account. The integral action of the birefringence of the fiber and the PC is represented with a Jones matrix of linear retarder.

半导体光放大器采用由张应变引起的自身双折射理论模型，光纤的双折射效应和偏振控制器对光的偏振调节作用综合用一个线性双折射琼斯矩阵表示。

First, based on Huygens' principle, formulas for double refraction and internal double reflection with different directions of propagation vector and wave vector are given.

虽然对晶体的双折射效应已有大量的研究，但都只关注于单个界面上的双折射双反射，没有适用于多个界面的连续双折射双反射的情况。

With the relations between the output of the former interface and the input of the latter, double refraction and/or double internal reflection in a crystal along two and multiple successive interfaces can be calculated.

并讨论了在晶体内沿多个面的连续双折射双反射，分析了前一界面输出量和后一界面输入量之间的联系，得到多次双折射双反射后的光线方向和光波法线方向。

Then with the relations between the output of interface 1 and the input of interface 2, double refraction and/or double internal reflection in a crystal along two successive interfaces can be calculated.

在惠更斯定理的基础上，对从空气到晶体的折射、从晶体到空气的折射、近光轴入射的晶体全内反射和近光轴反射的晶体全内反射这四种单个界面上的双折射双反射情况，给出了同时适用于o光和e光的光线方向和光波法线方向的普遍公式。

The theoretic transfer function of the filter made of N-stage HBFs, and the expression are obtained when N is 1, 2 or 3; the polarization independence of the filter is analyzed, and the relation between the frequency response and the parameter of filter such as the length, beat length of HBFs and the angles between HBFs is studied; finally, some experiments are performed to check the theory, and the result shows to have good agreement with the theoretic result.

从理论上得到了N段双折射光纤构成环镜滤波器滤波特性的结果；具体给出了N为1、2和3时的具体表达式；分析了所构成的环镜滤波器的偏振无关特性；讨论了双折射光纤的长度、拍长、双折射光纤之间夹角等因素对滤波器滤波特性的影响；最后，做了相关的实验验证，所得到的实验结果和理论模拟结果非常吻合，证实了理论的正确性。

A systemic research on the birefringence of side-hole fiber is presented. The research results show that the birefringence of circular-core side-hole fiber relies mainly on stress birefringence, its fast axis is parallel to the link line of the two holes, and its intrinsic birefringence increases exponentially with the angle and ellipticity of side holes.

本论文的主要研究结果和创新在于： 1、对边孔光纤的双折射特性进行了系统研究，提出圆芯型边孔光纤以应力双折射为主，两边孔连线方向为其快轴方向，其双折射大小与边孔张角和边孔椭圆度成指数关系。

According to the theory results,the two orthogonal polarized states of the fundamental mode become non-degenerate in this fiber and modal fields are quasi rectangular with appearing strongly linear polarization.And,the birefringence of the fiber was found to be due to the asymmetry of cladding structure.If the rate η between lognitudinal and transverse holes-spacing is reduced,the birefringence will increase strongly.

结果发现，矩形点阵微结构聚合物光纤基模两个正交偏振态不再简并，模场呈现类矩形且具有较强的线偏振特性；该光纤模式双折射产生于包层孔结构分布的不对称性，减小包层纵向孔间隔和横向孔间隔之比η值，双折射明显增强，适当调节η，可在更宽频带范围内实现高双折射单模运行。

A new type of high-birefringence photonic crystal fiber is brought forward, and the method introducing circinal holes with different sizes or elliptical holes which is used to design high-birefringence photonic crystal fiber is replaced by introducing fluorine-doped solid circles.

提出了一种新结构的高双折射光子晶体光纤，通过引入掺氟实心圆的方式形成双折射，而不采用大多数高双折射光子晶体光纤中引入不同孔径空气孔或椭圆空气孔的结构。

We found that the recording order of gratings with different periodicity made a crucial effect on the final forming of the microstructures. 4. Photo-induced birefringence phenomenons of P , containing mono azobenzene chromophore and P (MMA-co-GY7), containing diazobenzene chromophore were studied by static absorption and dynamic pump-probe techniques.

研究了单偶氮苯聚合物P、双偶氮苯聚合物P（MMA-co-GY7）的紫外-可见吸收光谱、荧光光谱，并对单偶氮苯、双偶氮苯聚合物材料光谱性能的差异进行了分析；研究了偶氮苯聚合物的超快光致双折射过程，并对单偶氮苯聚合物与双偶氮苯聚合物进行了比较，分析了含双偶氮聚合物超快光致双折射过程的来源。

Based on the laser longitudinal mode splitting theory, a novel scheme of dual-frequency laser with large frequency-difference is presented using electrically controlled birefringence of liquid crystal, and the transmitted resonant mode splitting by birefringent of Fabry-Perot etalon has been analyzed theoretically. A new element of liquid crystal Fabry-Perot etalon is designed and fabricated, which serves as aselector and splitter of both laser longitudinal modes and Fabry-Perot etalons transmitted resonant modes. Two different experimental systems of laser-diode end-pumped Nd:YAG laser have been set up using two different LDs, and the transmission of liquid-crystal cell have been measured. When the empty LCFP is inserted in the cavity of high-power LD pumped Nd:YAG laser, the oscillation of a single laser longitudinal mode have been observed, such a result shows that the designed and fabricated LCFP element is capable of selecting single axial mode. While an anti-reflected liquid crystal cell is inserted in the cavity of Nd:YAG laser end-pumped by the high-power LD, it is difficult to confirm weather the laser longitudinal modes have been spitted or not. The subject is summarized in this thesis and the improvement of the project has been presented.

论文以激光纵模的分裂理论为基础，提出了可望获得几十GHz甚至上百GHz的液晶电控双折射双频Nd：YAG激光器的总体方案，并对用双折射效应分裂F-P标准具透射谐振模进行了理论分析；设计并加工了一种集激光纵模选择、激光纵模分裂和F-P标准具谐振透射模分裂于一体的多功能元件——液晶电控双折射F-P标准具；建立了两种不同功率激光二极管端面泵浦的Nd：YAG激光实验系统，并对液晶盒的透射性质进行了测试；将未灌注液晶的空液晶F-P摘要标准具插入大功率LD泵浦Nd：、叭G激光谐振腔内，观察到了单纵模激光输出，说明所设计和加工的液晶F一P标准具具有纵模选择能力；将镀有增透膜的液晶盒插入大功率LD泵浦Nd八7AG激光谐振腔内，是否产生了激光纵模分裂现象还难以确定。

This brought fixed cost, but it also is meant at the same time use a source to won't make you singlehanded assume a problem.

这带来了一定的成本，但它同时也意味着使用开源不会让你独力承担问题。

He gained a small fortune in real estate.

他在房地产上发了一笔小财。