Abstract
Recording of multiplexed microholographic gratings with improved recording volume for high density optical data storage is proposed and demonstrated. By using a hybrid diffractive-refractive objective lens with extended depth of focus, we have achieved a recording beam size of approximately 1 μm and a focal depth of 20 μm. Multiple gratings corresponding to spectral lines within the 400-650 μm spectral band have been successfully multiplexed in a single recording spot or pit of size 1.25 μm on a DuPont photopolymer film using a white light source along with narrowband niters or dispersion elements, thus demonstrating the storage of multiple bits in a single pit. Simultaneous readout of multiple bits in a single storage pit is accomplished with a microspectrometer-type readout head using a white light source.
Original language | English (US) |
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Pages (from-to) | 1304-1306 |
Number of pages | 3 |
Journal | Optics Letters |
Volume | 31 |
Issue number | 9 |
DOIs | |
State | Published - May 1 2006 |
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics