Projection multiplex recording of computer-synthesised one-dimensional Fourier holograms for holographic memory systems: mathematical and experimental modelling

A Tribute to Sergey Odinokov

“…Sergey Borisovich gathered a team of specialists in the field of optics, holography and optoelectronic systems development within this project, which includes Aleksander Yuryevich Betin, Vladimir Ivanovich Bobrinev, Nina Mikhailovna Verenikina, Sergey Sergeevich Donchenko and others. Such a novel methods as pseudo-random adaptive phase masks addition [33,34], multiplexing of one-dimensional Fourier holograms [35], full-page readout, and line-byline readout of 1D-CGFH were proposed and developed [36]. The new methods were copyrighted by three patents of the Russian Federation [37,38].…”

Roadmap on holography

“…To this end, a new method of manufacturing holographic memory is proposed-a combination of the computer-aided synthesis of Fourier holograms and their rewriting on a photosensitive medium using a projection method in incoherent light (figures 11 and 12) [131][132][133][134][135][136][137][138][139][140].…”

Transparency function presentation of computer generated Fourier holograms for complex data page restoration

“…Conventional holographic memory systems developers use physical multiplexing of holograms in order to achieve a high density of data record. [1][2][3][4][5][6][7] Another trend to increase the record density of data storage system is the use of advanced modulation formats, which utilize both amplitude and phase modulation to represent digital data as symbols of constellation diagram (bauds). Application of methods such as spatial quadrature amplitude modulation (SQAM) for digital data encoding onto data page and its implementation to increase the holographic memory capacity were demonstrated theoretically and experimentally.…”

“…Recently it was demonstrated that computer generated Fourier holograms (CGFH) are a perspective candidate for application in holographic data storage (HDS) system design for the recording and reconstruction of binary amplitude data pages. [4][5][6][7]19) In the case of CGFH, a data page with any type of two-dimensional numeric complex function can be digitally encoded into the non-negative real valued holographic structure which can be physically realized as a diffraction optical element using amplitude-only or phase-only spatial light modulator (SLM) or transmitted onto the photosensitive carrier using a simple optical projection scheme based on amplitude-only SLMs or OLEDs. 20) Depending on the photosensitive material and post-processing methods, micro-holograms of data pages obtained in the projection schemes can be amplitude-only, phase-only or mixed amplitude and phase-modulating.…”