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Supersmall flying optical head for phase change recording media
Applied Optics
|June 18, 2010
Summary
A novel supersmall optically switched laser (OSL) head was developed for improved data detection. This OSL head significantly reduces signal variation and boosts signal-to-noise ratio for optical storage media.
Area of Science:
- Optical Engineering
- Data Storage Technologies
Background:
- Traditional optical storage systems face challenges with signal amplitude variation and noise.
- Developing compact and efficient optical heads is crucial for next-generation data storage.
Purpose of the Study:
- To propose and evaluate a supersmall optically switched laser (OSL) head.
- To enhance data and error signal detection in optical recording systems.
Main Methods:
- A complex optical cavity was formed using a laser diode on an air bearing slider and a recording medium.
- A photodetector was positioned to capture the laser's light output.
- The reflectivity of the laser facet facing the medium was reduced to less than 5%.
Main Results:
- Successful detection of data signals and track error signals from sampled servo marks.
- Significantly reduced signal amplitude variation due to flying height changes.
- Achieved a signal-to-noise ratio (SNR) of 36 dB over a 40 kHz to 20 MHz bandwidth for phase change media.
Conclusions:
- The proposed supersmall OSL head demonstrates robust performance in optical data detection.
- Reduced laser facet reflectivity is key to improving SNR and minimizing flying height effects.
- This technology offers potential for more reliable and higher-performance optical storage devices.
