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Applied Optics
|April 10, 1997
Summary
This study presents an optical system that corrects for spherochromatism in aspheric singlet lenses, enabling precise focusing and tracking across various wavelengths and substrate thicknesses for optical data storage. The innovation allows for reliable performance in optical disk systems.
Area of Science:
- Optical Engineering
- Data Storage Technology
Background:
- Aspheric singlet lenses in optical disk systems suffer from spherochromatism, limiting performance across different wavelengths and substrate thicknesses.
- This chromatic aberration affects focusing and tracking accuracy, hindering reliable data storage.
Purpose of the Study:
- To develop an optical system that compensates for spherochromatism in aspheric singlets.
- To enable a diffraction-limited spot to be precisely controlled in focusing and tracking for optical data storage applications.
Main Methods:
- Constructed a system using two adjustable microscope objectives and relay lenses.
- Mounted an aspheric singlet within an off-the-shelf optical head.
- Utilized adjustable collars on microscope objectives for aberration correction.
Main Results:
- Achieved a diffraction-limited spot controllable across wavelengths from 0.4-0.7 µm.
- Enabled movement of the focal spot by +/-100 µm in both focusing and tracking directions.
- Successfully corrected for spherochromatism and accommodated varying substrate thicknesses.
Conclusions:
- The developed optical system effectively overcomes the limitations of typical aspheric singlets in optical disk systems.
- This solution provides robust focusing and tracking capabilities, enhancing the reliability of optical data storage devices.
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