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Search Results: 1 - 10 of 11637 matches for " optical path difference "
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A novel polarization interferometer for measuring upper atmospheric winds

Mu Ting-Kui,Zhang Chun-Min,

中国物理 B , 2010,
Abstract: A static polarization interferometer for measuring upper atmospheric winds is presented, based on two Savart plates with their optical axes perpendicular to each other. The principle and characteristics of the interferometer are described. The interferometer with a wide field of view can offer a stable benchmark optical path difference over a specified spectral region of 0.55--0.63~$\mu $m because there are no quarter wave plates. Since the instrument employs a straight line common-path configuration but without moving parts and slits, it is very compact, simple, inherently robust and has high throughput. The paper is limited to a theoretical analysis.
Effects of optical axis direction on optical path difference and lateral displacement of Savart polariscope

Zhang Chun-Min,Ren Wen-Yi,Mu Ting-Kui,

中国物理 B , 2010,
Abstract: A simple method is applied to calculating the optical path difference (OPD) of a plane parallel uniaxial plate with an arbitrary optical axis direction. Then, the theoretical expressions of the OPD and lateral displacement (LD) of Savart polariscope under non-ideal conditions are obtained exactly. The variations of OPD and LD are simulated, and some important conclusions are obtained when the optical axis directions have an identical tolerance of \pm 1^{{\circ}}. An application example is given that the tolerances of optical axis directions are gained according to the spectral resolution tolerances of the stationary polarization interference imaging spectrometer (SPIIS). Several approximate formulae are obtained for explaining some conclusions above. The work provides a theoretical guidance for the optic design, crystal processing, installation and debugging, data analysis and spectral reconstruction of the SPIIS.
Optical Path Difference Analysis of Ultra-rapid-scanning Imaging Interferometer

SU Li-juan,YUAN Yan,XIANG-LI Bin,ZHANG Wen-xi,TAO Ran,

光子学报 , 2007,
Abstract: A new method to deduce the optical path difference of a kind of ultra-rapid-scanning imaging spectrometer is provided.The process of the derivation is elaborated,and the ultimate formula is given.The formula of the optical path difference is recalculated by setting several related parameters.The curves of optical path difference are presented.They are given by changing one of those parameters with other parameters at fixed values.The contributions of the parameters is compared and discussed.The design of this kind of ultra-rapid-scanning imaging interferometer and the recovery of the interferogram to spectrogram should base on the optical path difference formula.
On the Tolerance of Fixed Optical Path Difference and Step in Michelson Interferometer

WANG Li,ZHAO Bao-chang,XIANG-LI Bin,ZHANG Chun-min,QIN Ai-li,

光子学报 , 2007,
Abstract: On fixed optical path difference,interference intensity of four steps in an interval of quarter of wavelength is achieved by moving mirror step or coating on four quadrants for Michelson wind imaging interferometer.In this course,the error of fixed optical path difference and step will affect the result.The tolerance is discussed in the range of allowance precision.If the error has been known, accurate result can be achieved.
Recent developments in fiber optic spectral white-light interferometry
Yi Jiang,Wenhui Ding
Photonic Sensors , 2011, DOI: 10.1007/s13320-010-0014-z
Abstract: Recent developments in spectral white-light interferometry (WLI) are reviewed. Firstly, the techniques for obtaining optical spectrum are introduced. Secondly, some novel measurement techniques are reviewed, including the improved peak-to-peak WLI, improved wavelength-tracking WLI, Fourier transform WLI, and 3 × 3 coupler based WLI. Furthermore, a hybrid measurement for the intensity-type sensors, interferometric sensors, and fiber Bragg grating sensors is achieved. It is shown that these developments have assisted in the progress of WLI.
Design and analysis of a polarization interference imaging spectrometer with expanded field of view

Mu Ting-Kui,Zhang Chun-Min,Ren Wen-Yi,Zhang Lin,Zhu Bao-Hui,

物理学报 , 2011,
Abstract: To obtain straight interference fringes over larger field of view and thus acquire high-accuracy interference data, a wide field of view polarization interference imaging spectrometer based on a combined Savart plate is presented. The Savart plate is composed of positive and negative uniaxial crystals. The relationship between the optical path difference and incident angle is given. By numerical modeling and analysis examples with similar spectral resolution and total thickness, The simulation results show that the field of view to obtain straight interference fringes for the combined Savat plate is ten times as large as that for the conventional Savart plate.
Preliminary theoretical analysis of multi-wavelengthlaser active coherent beam combination

Han Kai,Xu Xiao-Jun,Zhou Pu,Ma Yan-Xing,Wang Xiao-Lin,Liu Ze-Jin,

物理学报 , 2011,
Abstract: In active coherent beam combination (CBC), a single-frequency seed laser is often considered to be indispensable for improving the spatial coherence property and obtaining high brightness in the far field. Nevertheless, the single-frequency radiation restricts the output power of coherently combined fiber amplifiers, owing to low stimulated Brillouin scattering (SBS) threshold. The seed laser oscillating at different frequencies proves to have the potential in mitigating SBS effects in fiber amplifiers, and therefore it is able to increase the emission power of CBC greatly. In this study, the basic mathematical model is founded on the basis of the fundamentals of CBC, and the multi-wavelength two-channel CBC estimation formula is proposed on the calculation of some two-channel examples. The optical path difference is the key factor in multi-wavelength CBC. We propose the concepts of "controllable area" and "uncontrollable area" for the optical path difference. If and only if the optical path difference falls into the controllable area, desirable combination effects can be obtained by the active control. In the case of getting the value of optical path difference randomly, excellent combination effects can still be gained and the probability has a close correlation with the spectrum profile, which is inversely proportional to the number of wavelengths approximatively. The multiple control method is competent for the multi-wavelength CBC. In this method, the optical path difference is adjusted into the controllable area by large optical path controllers and then the phase of each channel is locked by precise optical path controllers.
Calculation of the optical path difference and fringe location in polarization interference imaging spectrometer

Mu Ting-Kui,Zhang Chun-Min,Zhao Bao-Chang,

物理学报 , 2009,
Abstract: The principle of a polarization interference imaging spectrometer based on Wollaston prism is presented. The accurate optical path difference, splitting angle and fringe location plane of single Wollaston prism in four different conditions are calculated by wave-normal tracing method, and the theoretical formulas are introduced. The accurate values and approximate values of the optical path difference, the splitting angle, the fringe location are compared by computer simulation. The results show that the influences of wedge angle, incident angle and incident position on the accurate values and the approximate values are greatly different. The selection range of the wedges angle and the incident angle are deduced according to the accurate value, and the deviation of fringe location plane and its influence on Fourier transform lens are analysed. This study provides a theoretical and practical guidance for the study, design, modulation, experiment and engineering of the polarization interference imaging spectrometers.
Calculation and analysis of the optical path difference of modified wollaston prism

Wu Hai-Ying,Zhang Chun-Min,Zhao Bao-Chang,Li Ying-Cai,

物理学报 , 2009,
Abstract: The beam splitting and polarizing principle of modified Wollaston prism are presented. This paper analyses the propagation track of light wave in modified Wollaston prism by wave-normal-tracing method at random incidence angle and the formula of the path difference between e and o light waves are deduced. Computer simulations are carried out to give the curve of the optical path difference varying with incidence angle, incident azimuth angle, structural angle and wave length. The results will provide a theoretical basis for the study of polarization prisms and the development of polarization splitting apparatus.
Analysis of Optical Path Difference of a Ray Passing through FTIR

LIAO La-mei,HE Jian,ZHANG Qing-guo,

红外 , 2011,
Abstract: To study the optical path difference of a ray passing through a Fourier Transform infrared spectroscopy (FTIR), the symmetric analysis and geometrical optics methods are used to analyze the optical path expression when the ray is passing through one to three plates and a general optical path expression when a ray is passing through arbitrary plates is derived. On the basis of above analysis, the accurate expression of the optical path difference reduced by two arms of a Michelson interferometer with respect to the incident angle is analyzed. Finally, the condition for field widening is given. This research is of great significance to the design of a wide field FTIR.
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