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Study on Polarization-selective Diffractive Optical Elements and Radially Vector Beams

Author: YueShuJuan
Tutor: GuoChengShan
School: Shandong Normal University
Course: Optics
Keywords: Diffractive optical element Polarization selection A liquid crystal spatial light modulator Vector Beams
CLC: O436
Type: Master's thesis
Year: 2010
Downloads: 239
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Abstract


Is a polarization-selective diffractive optical element (PSDOE) is sensitive to the polarization state of the incident light of the diffraction optical element. For different incident or exit polarization states, which can produce a different output image. This polarization selection characteristics of PSDOE brought many new applications. The use of micro-processing technology in the the birefringent material surface preparation diffraction microstructure or in isotropic material surface preparation sub-wavelength diffraction grating is the main way to achieve PSDOE. The preparation process but such methods are complicated and difficult to achieve dynamic control of the output polarization distribution of the light field and the complex amplitude distribution. In order to achieve the output light field can be dynamically regulated PSDOE in recent years begun to explore the use of program-controlled high-resolution liquid crystal spatial light modulator achieve dynamic PSDOE the method. Use PSDOE can also be converted to the general output of the laser uniformly polarized laser vector distribution of the beam having a particular polarization, such as the radially polarized beam, the angle to the polarized beam, the vector of the optical vortex. In recent years, people began to explore the characteristics of the polarization modulation of the spatial light modulator to change the phase or amplitude of any spatial modulation mode to produce a desired optical mode, and has a spatial light modulator generates require having an arbitrary polarization structure vector beam method. Radial radial symmetry, vector beam focusing properties and potential applications, has aroused great attention of researchers. Therefore, this thesis through theoretical analysis, simulation and experimental and polarization selection method, the use of liquid crystal spatial light modulator, and the radial vector beam focusing properties were systematically studied. The main contents are as follows: 1. Proposed a method of using a single liquid crystal spatial light modulator for dynamically PSDOE. By the analysis and measurement of the polarization modulation characteristics of the liquid crystal spatial light modulator, we found that by appropriately setting the state of the liquid crystal spatial light modulator can be obtained in two orthogonal encoding channels. Two orthogonally encoded channels respectively on the two orthogonal components of the amplitude and phase of the output light field distribution calculation holographic encoding control and thus successfully in a liquid crystal spatial light modulator to achieve a controllable PSDOE output. Theory research focusing properties of the beam with radial cosine phase wavefront radial vector. The results show that, when the radial vector in front of the radial cosine phase wave after the beam is focused, the focus mode varies with the cosine function in the expression of different frequency parameter. In the high numerical aperture of the focusing system, the emergence of the offset of the maximum point of the strength, and accordingly a new intensity maximum point. For example, from a maximum point to two or more overlapping maxima appear. Further, when the frequency parameter is small, the maximum intensity value of the radial polarization component and the vertical polarization component than fluctuations in the focal plane; when the frequency parameters continue to increase, the maximum intensity value than the rapid decline; when the frequency parameters to a certain extent , maximum intensity value and bounced back. Similarly, as the changes in the frequency parameter, the offset of the maximum intensity point first a slow increase, followed by rapid decline.

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CLC: > Mathematical sciences and chemical > Physics > Optics > Physical optics ( wave optics )
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