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Li Z.,Xian Jiaotong University | Wang Z.,Xian Jiaotong University | Huang J.,Xian Jiaotong University | Qi J.,Xian Jiaotong University | And 2 more authors.
Zhongguo Jiguang/Chinese Journal of Lasers | Year: 2015

An extra constant difference between s and p component is produced after the light gets through the reflector based on total reflection,which lead to the change of the polarization state as a result. A novel design method of the polarization-preserving films for rectangular prism based on high-reflection films is proposed after deep analysis on its working mechanism and the geometry of the prism.The polarization state is kept invariant by plating the designed films on the two planes of the prism.The method has been theoretically and experimentally proved to be feasible.It is also easy to realize commercial application with the mature fabrication process of the high-reflection films. What's more,the polarization-preserving characteristic of the method works well with little incidence error. ©, 2015, Science Press. All right reserved. Source


Zhong L.,Xian Jiaotong University | Wang Z.,Xian Jiaotong University | Tang S.,Xian Jiaotong University | Gao J.,Xian Jiaotong University | Guo J.,Shaanxi Hengtong Intelligent Machines Co.
Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University | Year: 2013

To evaluate the influence of motion error of machine tool, such as pitch and yaw, on the roll error measurement, a mathematical model was established, then the conversion process of the lasers through the measurement system was calculated by Jones matrix method and measurement formula between the phase and the roll error was ultimately derived. The measurement error caused by angular motion error of the sensitive component, ie the half wave plate, was analyzed theoretically following polarization and crystal optics theory. Results show that the measurement error gets less than 0.1% which illustrates the feasibility of the method for roll error measurement by orthogonally polarized lasers. Source


Yu B.,Xian Jiaotong University | Wang Z.,Xian Jiaotong University | Huang J.,Xian Jiaotong University | Qi J.,Xian Jiaotong University | And 2 more authors.
Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University | Year: 2016

In order to decrease the phase-different fluctuation and increase the roll angle measuring accuracy in extrapolation interference method, a new mathematical model of measurement optical path and reference optical path was established through Jones matrix method. The model takes the frequency unsteadiness of two-frequency laser and the difference of photo-detector's response time into consideration based on the existing model and deduces that the frequency difference between the reference signal and measuring signal (frequency excursion) is the main cause of phase-different fluctuation. So it can be concluded that the frequency excursion is caused by the frequency unsteadiness of two-frequency laser and the difference of photo-detector's response time. The effect of frequency excursion on the roll angle measuring accuracy is also calculated. Based on the model, this paper presents a method of increasing two-frequency laser frequency stabilization and decreasing the difference of photo-detector's response time to eliminate phase-different fluctuation. Experimental results indicated that after decreasing the difference of photo-detector's response time, the range of phase fluctuation was decreased from 7°to 1° and the roll angle measuring error decreased by 85.7%, which proves that the new model is feasible. © 2016, Xi'an Jiaotong University. All right reserved. Source


Li Z.,Xian Jiaotong University | Wang Z.,Xian Jiaotong University | Huang J.,Xian Jiaotong University | Tang S.,Shaanxi Hengtong Intelligent Machines Co. | Guo J.,Shaanxi Hengtong Intelligent Machines Co.
Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University | Year: 2014

The phase loss caused by the right-angle prism seriously affects the resolution of the roll angle measurement system based on the extrapolation interference method. The influence was quantified with Jones matrix and then experimentally verified. A scheme based on the constructive interference of the high-reflection films was also proposed to solve this problem. The results indicated that the amplification factor in the sensitive area was reduced by 40.7% due to the phase loss; Using two plane mirrors perpendicular to each other to replace the right-angle prism could basically eliminate the effects on the resolution of the roll angle measurement system caused by phase loss. The phase range was increased to 349.2° from 55.8° when the right-angle prism was replaced by the plan mirrors, which is close to the reference data 358.5° and hence the feasibility using constructive interference principle of high-reflection films to solve phase loss was proved. This method and theory can also provide a theoretical basis and solution thoughts for the optical phase loss induced by total reflection. Source

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