| 1. | Photoinduced birefringence and holographic recording were performed by using ar laser ( 488 nm ) as writing beam and he - ne laser ( 632 . 8 nm ) as reading beam
写入光为线偏振壮离于激光，读出光为线偏振he ne激光，信号山ccd多道分析器接收。 |
| 2. | Employing writing beams with appropriate intensity distributions and external electric fields along proper directions , arrays of planar and channel waveguides can be fabricated in various pr crystals
研究结果表明：采用合适的光场强度分布以及合适的外加电场可以在不同光折变晶体中写入平面波导阵列和通道波导阵列。 |
| 3. | Fourthly , the incident intensity threshold of the fanning effect in twm was measured in the ce : knsbn crystal , and it is about 20mw / cm , while using 632 . 8nm red light with e polarization as writing beam
实验发现在e偏振光写入情况下， ce ： knsbn晶体中光扇存在写入光强度阈值特性，当写入光强大于20mw cm ~ 2时光扇效应明显增强。 |
| 4. | The blocking - layer and the dielectric mirror separate the write beam and the read beam , and the dielectric mirror reflects the read light also . in order to separating the write beam and the read beam quietly , and reflecting the read bean in the most limit
液晶光阀的阻光层和介质镜层起着隔离写入光和读出光的作用，介质镜层还起着反射读出光的作用。 |
| 5. | ( 3 ) the bragg - shift phenomenon of transmission holographic grating is investigated in theory and experiment . as a result , the bragg - shift phenomenon will be restrained when the intensity ratio of initial writing beams is one
对透射体全息光栅在读出过程中的布拉格漂移现象进行了理论和实验分析，得出在本实验条件下，当写入光强比为1 1时可以很好地抑制布拉格漂移现象的发生。 |
| 6. | The main contents of this dissertation are as follows : ( 1 ) according to the set of equations governing the pr process , index changes in pr crystals induced by writing beams with different intensity profiles are theoretically analyzed and numerically simulated
所开展的工作以及得到的结论如下：从光折变动力学方程组出发对光折变晶体中光致折射率变化进行了理论分析，并建立了由写入光的强度分布得到光致折射率变化分布的数值模拟方法。 |
| 7. | As the results , firstly , some steady parameters were determined , including the gain coefficient , diffraction efficiency of the volume grating and response time t1 of twm under different total incident intensity i0 , ratio of two writing beams mo , angle between two writing beams 2 and polarization conditions
论文给出了不同写入光强比、写入总光强、写入光夹角及偏振光下ce ： knsbn晶体的两波耦合增益系数、衍射效率、响应时间的变化规律。 |
| 8. | At the different recording angles , the raman - nath diffraction and bragg diffraction phenomenon are observed , respectively . then , the wavelength selectivity and the relationship of diffraction efficiency and polarization state are discussed when the recording angle of 60 ? formed by two writing beam
分别观察到了写入光束夹角不同时光栅的拉曼-奈斯衍射和布拉格衍射现象，并对双光束夹角为60时写入光栅的波长选择性及衍射效率与入射光偏振态的关系进行讨论。 |
