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Random electromagnetic beam focusing and transmission of large numerical aperture

Author: HuaLiMin
Tutor: PuJiXiong
School: Huaqiao University
Course: Optics
Keywords: Vector diffraction integral Large numerical aperture focusing Partially coherent Vortex beams Ultrashort light pulses
CLC: O436.1
Type: Master's thesis
Year: 2011
Downloads: 25
Quote: 0
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Abstract


Beam focusing and transmission is a very important research topic. Large numerical aperture of the focusing spot subwavelength scale can be obtained, can produce better results in micro-processing, data storage and other applications. On the other hand, partially coherent beams and vortex beams has all the advantages of laser fusion, the application of communications and micro-operation of great significance to study the emergence and nature. In this dissertation, the light beams of different polarizations large numerical aperture focusing nature of partially coherent vortex beams experiments conducted a detailed study of the main tasks include: 1. According to the Debye vector diffraction integral theory, research entirely large numerical aperture focusing coherent partially polarized light beam theory, a detailed analysis of the intensity distribution of the light of the relevant parameters of the focusing field. On this basis, further study of the theory of partially coherent partially polarized vortex beams and large numerical aperture focusing, systematic analysis of the distribution of the degree of polarization of the incident light and the numerical aperture of the focusing lens angle near the focus of the light intensity and the degree of coherence. The study found that changing the size of the degree of polarization of the incident light beam to obtain the type of eccentricity elliptical focal spot, increasing the numerical aperture of the lens can reduce the focusing spot size. Departure from the Debye vector diffraction theory, large numerical aperture focusing properties of elliptically polarized vortex ultrashort optical pulses. Analysis of ultrashort light pulses pass through a large numerical aperture lens focusing light intensity distribution, a phase distribution, changes in the group velocity, angular momentum and other characteristics of elliptical polarization vortex. The study found that the elliptically polarized vortex femtosecond light pulses through large numerical aperture lens focusing light pulses from the focus of the closer, the group velocity of the pulse, the slower the farther away from the focus, the faster the pulse group velocity. The higher the topological charge, the more slowly the group velocity of the pulse. Pulse at the focal point of the angular momentum with the increase of the numerical aperture of the lens and the pulse width increases. Experimentally degree of coherence and topological charge adjustable partially coherent vortex beams. Analysis of partially coherent vortex beams of light intensity distribution characteristics, as well as partially coherent vortex beams with a plane wave or spherical wave interference interference field distribution characteristics. The degree of coherence of the light beam can be changed by adjusting the position of the ground glass, by replacing the spiral phase plate can get different topological charge of vortex beams. With the changes in the degree of coherence and topological charge, the light intensity distribution corresponding changes. Mach-Zehnder interferometer method, you can easily and simply measure the topological charge of the partially coherent vortex beams.

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