Optical system of holographic memory card writing/reading equipment

Gabor Erdei, Gabor Szarvas, Emoke Lorincz, Jozsua Fodor, Ferenc Ujhelyi, Pal Koppa, Peter Varhegyi, Peter I. Richter

Research output: Conference article

7 Citations (Scopus)


We developed a standard credit card-shaped general-purpose data carrier, a reflective Holographic Memory Card (HMC), and the appropriate equipment for its handling. Data recording and retrieval are accomplished by polarization Fourier holography using a thin layer of photo-anisotropic polymer as the storage material. The data density is about 1 bit/μm2, the maximum storage capacity of the card is around 10 Mbytes assuming a 10×10 mm storage area. Data is stored in the form of microholograms, from which 40×40 pieces are recorded on the HMC. The optical system involved performs data writing/reading/erasing and also locates the position of the microholograms. Main components of the optical system are an SLM and CCD for opto-electronic conversion, a frequency-doubled solid-state laser source, a beam shaping system that provides homogeneous illumination of the SLM, an interferometer for hologram construction, special Fourier transforming objectives and a random-phase mask for optimized hologram recording. Our results include conceptual planning, design, fabrication and assembling of the optical system. In the present paper we describe principle of operation including layout of the elements, and explain the operation of the equipment in detail.

Original languageEnglish
Pages (from-to)109-118
Number of pages10
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - jan. 1 2000
EventNovel Optical Systems Design and Optimization III - San Diego, USA
Duration: júl. 31 2000aug. 1 2000

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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