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 and a focal depth of . Multiple gratings corresponding to spectral lines within the spectral band have been successfully multiplexed in a single recording spot or pit of size on a DuPont photopolymer film using a white light source along with narrowband filters 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.
© 2006 Optical Society of America
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