I also carried some research on the bragg grating composed by alternate left - handed material and right - handed material . in the reflective spectrum of the bragg grating , there exists bragg top zone ( with reflectance almost 100 % ) . however , i found that there exists some narrow transmission bands located in the bragg zone under some conditions 另外，这篇论文里还要讲到正负交替的材料组成的布拉格光栅也有很反常的现象，在光栅的反射谱上，我们不仅可以观察到和传统布拉格光栅相类似的布拉格平顶区，我们还可以看到在一定条件下，布拉格平顶区中会有一个很窄的反常透射区，也就是说只有很窄区域的波长可以透过光栅，而且中心波长是100 %透过。
The results is the following . ( 1 ) with the condition of table 4 . 1 , the low reflectance vale will move towards the center wavelenghth ( 550nm ) , the influence on refractive index of the films is very little , the extinction coefficient ( k ) have trend of increase and the thickness of the films decrease when increasing the oxygen flow . the rutile phase increase and the surface morphology is dense and smoothnes with increasing the oxygen flow 其结论如下: ( 1 )随着氧流量的增加薄膜的反射低谷向中心波长550nm处移动;消光系数k随氧流量的增加有增大的趋势;氧流量的变化对折射率的影响不大;薄膜的厚度随氧流量的增加而减少;氧流量增加薄膜中的金红石相tio2含量增多,薄膜表面由粗糙疏松变的致密光滑。
The water ' s absorption in tissues is particularly great , so the erbium laser is suitable . simultaneously we design the laser alignment system , the laser shaping system and the focal setting system . doing the theoretical analysis and experiments , we research and develop a medical blood - sampling instalment of laser , with the good application prospect 因为掺铒yag固体激光器输出的中心波长为2 . 94 m ，与水的吸收峰相吻合，而且皮肤组织中水的吸收非常显著，所以铒激光是合适的，同时设计了激光对准系统、激光整形系统和聚焦系统，通过理论和实验研究，研制出一台激光采血仪样机，具有良好的应用前景。
Several materials with large coefficient of expansion were selected to make packaging components , and it was found that the packaging materials have good temperature sensitivity and compatibility with optical fibers . experimental accuracy and repetition of fbg temperature sensitivity and compensation were discussed . have selected several materials which has bigger coefficient of expansion to do packaging components , have made many temperature experiments , there have not flaws , such as aging , crackle , absciss layer , packaging materials have good temperature sensitivity and compatibility with optical fiber ; have designed the simple and practical packaging components , have performed a serials of experiments about accuracy and repetition of fbg wave - length , have obtained the first step conclusion ; have analyzed the result and made comparison between the result of different experiment , have summarized the best packaging effect and several rules to reduce mistskes 本文所做的主要工作包括以下几个内容：一、选取了常见的热膨胀系数大的材料制作封装元件，经过多次一80到80反复测试，封装元件没有出现老化开裂、封装裂纹、空洞、离层等缺陷，封装材料具有良好的温敏稳定性及复用性，与光纤相容性较好；二、对光纤光栅进行简单、实用的封装处理，就封装效果的优劣性、波长测量的准确度、重复性和封装时产生的波长损失等方面进行了一系列的实验，得出了初步的结论；三、对温敏和温度补偿式封装的实验数据进行了详细的分析和对比，从数字上对温变过程中光纤光栅中心波长的改变及温变曲线进行了定量的分析，在大量实验数据分析结果的基础上，总结出哪种材料封装效果更好，以及如何有效的减小实验误差。
Theoretical analysis shows : compared with oled , moled with alq3 as light - emitting layer can emit different wavelength light by modulating length of cavity , spectral full width at half - maximum of moled changes from 100nm to 10nm ~ 20nm and the light intensity at peak is increased by about 20 times , and luminous efficiency can be enhanced 理论分析表明：通过调节腔长，用alq3作发光层的moled可以发出不同中心波长的光，谱线宽度由oled的约100nm变为10 ~ 20nm ，峰值光强提高20倍左右，总发光效率也有所提高。
