Diffractive Optical Element Design and Analysis for Miniature MEMS DVD Pickup
碩士 === 國立臺灣科技大學 === 電子工程系 === 92 === In this thesis, diffractive optical elements (DOEs) are designed to implement optical functions of collimation and beam splitting for a MEMS-type DVD pickup at 405nm wavelength and the efficiency of DOEs is analyzed with Matlab. A Fresnel lens with the first, sec...
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ndltd-TW-092NTUST4280752015-10-13T13:28:04Z http://ndltd.ncl.edu.tw/handle/05193301778108498635 Diffractive Optical Element Design and Analysis for Miniature MEMS DVD Pickup 微機電DVD讀寫頭繞射光學元件設計與分析 Wen-Jie Chen 陳文傑 碩士 國立臺灣科技大學 電子工程系 92 In this thesis, diffractive optical elements (DOEs) are designed to implement optical functions of collimation and beam splitting for a MEMS-type DVD pickup at 405nm wavelength and the efficiency of DOEs is analyzed with Matlab. A Fresnel lens with the first, second, and third zone quantized as eight, four, two phase levels, respectively is presented and the estimate of its efficiency can reach 92%. Moreover, the majority of the beam splitters for three beam tracking in commercial DVD pickup employ binary phase gratings. A 1-to-3 beam splitter with equal-side triangular saw-tooth profile has been investigated as an improved solution and the geometrical size of the profile has been optimized for several desired energy ratio. A table of optimal phase level for a given energy ratio and desired minimum required total efficiency with the consideration of fabrication cost has also been provided for a reference in system design. Cheng-Huan Chen 陳政寰 2004 學位論文 ; thesis 41 en_US |
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碩士 === 國立臺灣科技大學 === 電子工程系 === 92 === In this thesis, diffractive optical elements (DOEs) are designed to implement optical functions of collimation and beam splitting for a MEMS-type DVD pickup at 405nm wavelength and the efficiency of DOEs is analyzed with Matlab. A Fresnel lens with the first, second, and third zone quantized as eight, four, two phase levels, respectively is presented and the estimate of its efficiency can reach 92%. Moreover, the majority of the beam splitters for three beam tracking in commercial DVD pickup employ binary phase gratings. A 1-to-3 beam splitter with equal-side triangular saw-tooth profile has been investigated as an improved solution and the geometrical size of the profile has been optimized for several desired energy ratio. A table of optimal phase level for a given energy ratio and desired minimum required total efficiency with the consideration of fabrication cost has also been provided for a reference in system design.
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Cheng-Huan Chen |
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Cheng-Huan Chen Wen-Jie Chen 陳文傑 |
author |
Wen-Jie Chen 陳文傑 |
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Wen-Jie Chen 陳文傑 Diffractive Optical Element Design and Analysis for Miniature MEMS DVD Pickup |
author_sort |
Wen-Jie Chen |
title |
Diffractive Optical Element Design and Analysis for Miniature MEMS DVD Pickup |
title_short |
Diffractive Optical Element Design and Analysis for Miniature MEMS DVD Pickup |
title_full |
Diffractive Optical Element Design and Analysis for Miniature MEMS DVD Pickup |
title_fullStr |
Diffractive Optical Element Design and Analysis for Miniature MEMS DVD Pickup |
title_full_unstemmed |
Diffractive Optical Element Design and Analysis for Miniature MEMS DVD Pickup |
title_sort |
diffractive optical element design and analysis for miniature mems dvd pickup |
publishDate |
2004 |
url |
http://ndltd.ncl.edu.tw/handle/05193301778108498635 |
work_keys_str_mv |
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