||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.
|| ZEMAX Optical Design Program User’s Guide Version 10.0, Focus Software, Incorporated, 2001|
 ZEMAX Optical Design Program is a product of Focus Software Inc. , P.O.Box 18228, Tucson, AZ, 85731, USA
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