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Optics Letters

Storage of 2000 holograms in a photochemical hole-burning system

Bern Kohier, Stefan Bernet, Alois Renn, Urs P. Wild

Published Dec 15, 1993• 38 citations
Publisher

Abstract

By use of a novel recording technique, 2000 high-resolution image holograms were recorded in a single spectral hole-burning sample at different frequencies and at different values of an applied electric field. We recorded each hologram by sweeping the frequency of a cw laser over a narrow interval while simultaneously changing the hologram phase by 2π. This swept recording technique produces holograms that have increased diffraction efficiency and that exhibit reduced cross talk with respect to conventional frequency-multiplexed holograms.

DOI
10.1364/ol.18.002144

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By use of a novel recording technique, 2000 high-resolution image holograms were recorded in a single spectral hole-burning sample at different frequencies and at different values of an applied electric field. We recorded each hologram by sweeping the frequency of a cw laser over a narrow interval while simultaneously changing the hologram phase by 2π. This swept recording technique produces holograms that have increased diffraction efficiency and that exhibit reduced cross talk with respect to conventional frequency-multiplexed holograms.
Experiments verifying a new method of storing spectral hole-burning holograms, which yields reduced cross talk as compared with standard spectral hole-burning holograms, have been conducted. Results demonstrating the reduced width of this type of hologram in both frequency and the applied electric-field dimension are presented. Analytic solutions for the spectral width and diffraction efficiency of these holograms are presented. Using this exposure technique, we have recorded 6000 holograms in a single spectral hole-burning sample.
A new hologram type in spectral hole-burning systems is presented. During exposure, the frequency of narrow-band laser light is swept over a spectral range that corresponds to a few homogeneous linewidths of the spectrally selective recording material. Simultaneously the phase of the hologram is adjusted as a function of frequency-the phase sweep function. Because of the phase-reconstructing properties of holography, this recording technique programs the sample as a spectral amplitude and phase filter. We call this hologram type frequency and phase swept (FPS) holograms. Their properties and applications are summarized, and a straightforward theory is presented that describes all the diffraction phenomena observed to date. Thin FPS holograms show strongly asymmetric diffraction into conjugated diffraction orders, which is an unusual behavior for thin transmission holograms. Investigations demonstrate the advantages of FPS holograms with respect to conventional cw recording techniques in freq ncymultiplexed data storage. By choosing appropriate phase sweep functions, various features of holographic data storage can be optimized. Examples for cross-talk reduction, highest diffraction efficiency, and maximal readout stability are demonstrated. The properties of these FPS hologram types are deduced from theoretical considerations and confirmed by experiments.
A novel technique of recording holograms in spectral hole-burning systems has been developed. During hologram exposure, the frequency of narrow band laser light is `swept' over a frequency range, corresponding to a few homogeneous linewidths of the spectrally selective recording material. Simultaneously the phase of the hologram is controlled as a function of the frequency--the so called phase sweep function. Due to the phase reconstructing properties of holograms, this recording method programs the sample as a spectral amplitude and phase filter. This leads to interesting diffraction phenomena: plane swept holograms show strongly asymmetric signals in conjugated diffraction orders.
In addition to its importance for the optical spectroscopy of solids, photochemical spectral hole burning (PSHB) has attracted great interest due to its potential use in high density optical data storage [1]. By encoding information as a function of frequency an enormous increase in storage is possible compared to conventional optical storage materials. The most optimistic estimates predict an increase given by the ratio of the inhomogeneous linewidth to the homogeneous linewidth of the optical transition responsible for hole burning. Until now, however, there have been relatively few investigations of the practical limitations to storing a large number of spectral holes [2,3]. We describe here a recent experiment in which 2000 grayscale images were successfully recorded as holograms in the PSHB material chlorin in polyvinylbutyral. In holographic spectral hole burning the relative phase of the interfering light waves used to prepare the hologram has a strong influence on diffraction properties and, hence, on crosstalk between adjacent holograms [4]. By controlling the phase and frequency during burning in a novel manner, we have minimized crosstalk between the stored images.
The properties of holographic recording and detection of spectral holes in the frequency and electric-field dimension are investigated. To optimize the storage properties of optical memory devices, based on spectral hole burning and holography, cross-talk effects between adjacent holograms have to be minimized. These interactions depend on the relative phases of the holograms chosen during the recording stage. Using free-base chlorin (2,3-dihydroporphyrin) in polyvinyl butyral as host at a temperature of 1.7 K, the influence of the relative phase difference between holograms is demonstrated in both the frequency and the electric-field dimension. Experimental results are presented for rows and columns of holograms stored either in the laser frequency or the electric-field dimension and compared to transmission data. Using both dimensions a 10 x 10 matrix of holograms has been stored within the range of a single wave number.