Abstract
Holographic recording media can store the amplitude and the phase, or the complex amplitude, of a beam on the basis of holography. Owing to this characteristic, digital data can be encoded onto the complex amplitude of a signal beam in holographic data storage. However, most of conventional holographic storage systems encode digital data onto the amplitude alone because there are difficulties for modulating and detecting the phase. To solve the difficulties, a holographic storage system using digital holographic techniques has been proposed. With the help of digital holographic techniques, it is possible to modulate and detect the complex amplitude of a signal beam. Moreover, the proposed system can modulate the complex amplitude of a reference beam. In this paper, by making use of the capability, a correlation-based multiplexing with uncorrelated reference beams is demonstrated in the proposed system. Multiple holograms can be recorded in the same volume of a recording medium with no need for mechanical movements. Experimental results show that the proposed system with a correlation-based multiplexing can improve the storage capacity and can utilize the full potential of a recording medium without crosstalk noise stem from the optical setup.
Highlights
Holographic data storage has been considered to be an attractive candidate for the next-generation optical data storage technology because of its potential for simultaneously achieving huge capacity and fast transfer rates [1,2]
To retrieve the digital data, the volume hologram is illuminated with the reference beam that is used during recording
The proposed system can modulate and detect the complex amplitude distribution of a signal beam in a common-path setup consists of a single spatial light modulator (SLM) and a single image sensor
Summary
Holographic data storage has been considered to be an attractive candidate for the next-generation optical data storage technology because of its potential for simultaneously achieving huge capacity and fast transfer rates [1,2]. The proposed system can modulate and detect the complex amplitude distribution of a signal beam in a common-path setup consists of a single SLM and a single image sensor. The generated signal and reference beams are optically Fourier transformed to form an interference pattern in a recording medium. An addition beam is generated for the detection of the complex amplitude distribution of a reconstructed signal beam We refer to this additional beam as a phase-shifted beam, and this beam is given by p( x, y). Through the above procedure using other reference beams, individual complex amplitude data pages can be independently retrieved from the multiplexed volume holograms
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