圆偏振光的产生、测量与自旋偏振电子的光注入

理论上给出了线偏振光通过波片产生的椭圆偏振光的圆偏振度与方位角和相位延迟量的关系.结果表明,圆偏振度对方位角的变化更灵敏,在保持圆偏振度不变条件下,每提高方位角精度一度,则可降低相位延迟精度至少两度,这将改变人们重视相位延迟而轻视方位角精度的通常做法,降低1/4波片的加工难度和造价.还给出了宽带光谱分布和波片相位延迟色散对圆偏振度影响的解析解.发展了一种圆偏振度和波片相位延迟实验测量的简单方法.利用这种方法实验测试了Newport公司生产的1/4波片的相位延迟.     

光纤电压传感器中波片精度对测量影响的探讨

分析了根据晶体的电光效应制作的光纤电压传感器,当弱信号调制不能满足一定条件时,则输出光强调制波将出现失真,除线性项外还将产生大量的谐波分量,且这些谐波分量与所加偏置即λ/4波片的相位有关。借助贝塞尔函数展开式从中得到了弱信号调制的具体条件。     

图的完全着色与消色数

在一个给定图中,研究消色数的大小自然是一个问题,但对于一般图而言,确定它们的消色数是非常困难的,这已被Yanaakis and Garri证明.文章刻画了完全κ-部图中消色的数为1,2和3的图并且确定了路图的消色数和极大外可平面图消色数的下界.     

Orthogonal linear polarized lasers(Ⅲ) Applications in self-sensing

In this paper, the applications of orthogonal linear polarized lasers in self-sensing are reviewed. The properties for such a laser include the production of a new frequency in one longitudinal mode spacing, the tuning of frequency difference, the change of polarization states as cavity tuning, the control of mode competition intensity, the optical feedback, and so on. The orthogonal polarized lasers have been used as a laser nanometer ruler based on competition between two polarized lights in a HeNe laser and as a displacement measurement tool based on the optical feedback in the orthogonal polarized lasers. They are also used in the phase retardation measurement of a waveplate, the angle measurement, the vibration measurement, the pressure/force measurement, the weak magnetic field measurement,and so on. The structures of these new devices are simple and compact with the great advantages of high resolution and high accuracy.Some of these devices can trace to the source of the laser wavelength. The nanometer laser ruler is an example whose measurement range is 12 mm, resolution is 79 nm and linearity is less than 5×10- 5. The repeatability of the phase retardation measuring system of waveplate can reach 3'.     

消色差复合延迟片

让在某一波长的1/4波片和1/2波片的两快轴的夹角为60°,组成复合1/4波片,则该复合片在该波长附近是消色差的;类似地,也得到了消色差1/2波片,并被实验所证实。     

Orthogonal linear polarized lasers(III) --Applications in self-sensing

In this paper, the applications of orthogonal linear polarized lasers in self-sensing are reviewed. The properties for such a laser include the production of a new frequency in one longitudinal mode spacing, the tuning of frequency difference, the change of polarization states as cavity tuning, the control of mode competition intensity, the optical feedback, and so on. The orthogonal polarized lasers have been used as a laser nanometer ruler based on competition between two polarized lights in a HeNe laser and as a displacement measurement tool based on the optical feedback in the orthogonal polarized lasers. They are also used in the phase retardation measurement of a waveplate, the angle measurement, the vibration measurement, the pressure/force measurement, the weak magnetic field measurement, and so on. The structures of these new devices are simple and compact with the great advantages of high resolution and high accuracy. Some of these devices can trace to the source of the laser wavelength. The nanometer laser ruler is an example whose measurement range is 12 mm, resolution is 79 nm and linearity is less than 5×10^-5. The repeatability of the phase retardation measuring system of waveplate can reach 3′.     

一种测定波片相位延迟角的简便方法

介绍了一种利用两个线偏器测定波片相位延迟角的简便方法,并利用岛津分光光度计对已知1／4波片进行了测量。实验证明,此方法具有测量精度高,操作简单等优点,极适合在实验中运用。     

“多级”波片相位延迟误差的讨论

本文定量地讨论了由设计误差、加工误差、测量以及客观误差引起的“多级”波片的相位延迟误差。并给定了全部误差的允许取值范围。     

空间太阳望远镜中Hα双折射滤光器的设计

空间太阳望远镜中的滤光器必须满足空间使用要求。为改进现有滤光器,设计了新型的滤光器,省去了用于带动波片旋转的多台步进电机及相关传动机构,有效减轻了整个仪器的质量,提高了可靠性。在实验室中保持滤光器内部实际工作温度恒定,找出旋转半波片准确的方位角并调整到理论位置,确定其透过波带位置在656.3±0.2nm,波片不再需要旋转。空间环境模拟试验验证了系统结构的合理性。该结构设计紧凑、密封无泄漏、温控有效。     

Orthogonal linear polarized lasers (Ⅲ)——Applications in self-sensing

In this paper, the applications of orthogonal linear polarized lasers in self-sensing are reviewed. The properties for such a laser include the production of a new frequency in one longitudinal mode spacing, the tuning of frequency difference, the change of polarization states as cavity tuning, the control of mode competition intensity, the optical feedback, and so on. The orthogonal polarized lasers have been used as a laser nanometer ruler based on competition between two polarized lights in a HeNe laser and as a displacement measurement tool based on the optical feedback in the orthogonal polarized lasers. They are also used in the phase retardation measurement of a waveplate, the angle measurement, the vibration measurement, the pressure/force measurement, the weak magnetic field measurement, and so on. The structures of these new devices are simple and compact with the great advantages of high resolution and high accuracy. Some of these devices can trace to the source of the laser wavelength. The nanometer laser ruler is an example whose measurement range is 12 mm, resolution is 79 nm and linearity is less than 5×10-5. The repeatability of the phase retardation measuring system of waveplate can reach 3'.