Dissertation > Industrial Technology > Metallurgy and Metal Craft > Welding, metal cutting and metal bonding > Welding equipment > Laser welding equipment

Research and Design of Multi-Beam Device for HD Slider Bonding

Author ZhengZhouPing
Tutor YaoYong
School Harbin Institute of Technology
Course Physical Electronics
Keywords Binary optics Beamsplitter Dammann grating Genetic Algorithms
CLC TG439.4
Type Master's thesis
Year 2008
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Booming microelectronics processing binary optics allows precise phase diffraction gratings possible. The binary optical gradually from theoretical research into the engineering applications . Dammann grating appear makes possible to array splitting Dammann grating is a the Fraunhofer Wo fee of diffractive optical elements , it is simple to use , stable performance advantages as a beam splitter . This article first grating theory - depth and detailed analysis and discussion . Starting from common grating established the theoretical basis of the grating of the beam splitter to obtain the concrete expression of the calculation of the diffraction efficiency of the beam splitter . In order to obtain the even - numbered - grating beam splitter , the grating design using the complementary structure of the front and rear half-cycle , and in theory gives a detailed demonstration process . Dammann grating initial optimization using MATLAB Fourier spectrum analysis , finite periodic grating beam splitter in ideal conditions splitting effect diagram . Coordinate optimization algorithm used to calculate the grating mutation to write this article focus and difficulty . The optimization results directly determine the performance of the grating beam splitter . In this paper, the adaptive genetic algorithm to write the optimization process of the beam splitter , and optimize the splitting ratio twelve Dammann grating of beam splitter . With MFC write detection software to detect the grating diffraction efficiency at all levels , at all levels of light powerful small . Followed by BEAMPRO software on the characteristics of the grating vector analysis, the detailed relationship to obtain the performance of the beam splitter with the grating structure of the various parameters change . Finally the grating made ??of the tests and the sub - beam experiments . The test results are the depth of the relative error of 1% , while a line width of 10% relative error . The measured spot is the 130um about . Grating splitting effect of the beam splitter is obvious, the diffracted light intensity distribution uniform, other diffraction order of disturbance is smaller , designed and produced to meet the requirements .

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