多波長光學讀寫頭之研究

NCU Institutional Repository > 理學院 > 光電科學研究所碩士在職專班 > 博碩士論文 > Item 987654321/7127

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题名:	多波長光學讀寫頭之研究
作者:	盧威志;Wei-chih Lu
贡献者:	光電科學研究所碩士在職專班
关键词:	藍光讀寫頭;光學頭;opu;bd
日期:	2008-06-27
上传时间:	2009-09-22 10:50:08 (UTC+8)
出版者:	國立中央大學圖書館
摘要:	隨著資訊與消費性產業的發展，光儲存系統之容量與速度一直不斷的被提升，已到達新世代之藍光光碟。因此，為了反向相容於早期之CD與DVD規格，具有多種雷射波長與數值孔徑之光學讀寫頭設計乃因應而生。本研究結合傳統型與積體化光學讀寫頭之優點，提出多種具有簡單光路之三波長藍光光學讀寫頭設計。利用積體化光學模組與全像光學元件之特性，設計出具有單一光路之光學讀寫頭架構，可應用於可讀取CD與DVD碟片之藍光光儲存系統上。在個別系統設計上，採用兩種不同的光學系統。第一系統為雙物鏡系統，另一則為單物鏡系統。在積體化光學模組設計上，像散法及刀緣法則分別被使用作為聚焦伺服之機制。根據個別的物鏡系統以及積體化光學模組，本論文發展出六種不同之三波長藍光光學讀寫頭設計。模擬與分析得到滿意之結果，並顯示出實現具有精簡光學架構之三波長藍光光學讀寫頭之可行性。 Along with the progresses of information technology (IT) and consuming industry, the capacity and speed of optical storage systems have been continuously promoted to the new generation Blu-ray Disc (BD). Under these circumstances, for the purpose of backward compatibility to earlier CD and DVD specifications, the optical pickup head (OPH) designs with multiple laser wavelengths and numerical apertures (NAs) are strongly anticipated. This study combined the advantages of conventional and integrated OPHs to present several types of three-wavelength blue-light OPH designs with simple optical configurations. Utilizing the features of an integrated optical unit (IOU) and a holographic optical element (HOE), the OPH designs with single optical path were proposed. They could be applied to the blue-light optical storage systems capable of retrieving CD and DVD disks. In individual system designs, two distinct kinds of optical systems were adopted. The first is the system with two objective lenses and the other is that with a single objective lens. In the IOU designs, the astigmatic and knife-edge methods were respectively adopted as the focusing servo mechanism. Six designs of three-wavelength blue-light OPHs have been developed corresponding to distinct system and IOU schemes in this thesis. Simulations and analyses give the satisfactory results and show the feasibility for implementing the three-wavelength blue-light OPHs with compact optical configurations.
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