Frequency and phase swept holograms in spectral hole-burning materials

Abstract

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.

Derivation and measurement of the M/# in spectral hole burning media

“…the frequency domain. 12,000 holograms at a single location by frequency multiplexing has been demonstrated [1,4] . The storage capacity can be further increased by combining angle and frequency multiplexing.…”

Atomic Processing of Optically Carried RF Signals

“…If the submodulation period 1/T is much smaller than the width / νδϕ ϕ of g( , the signal intensity reduces to , = ν − ν ϕ θ (43). This is the well known photon echo situation that leads to optimal spectral resolution by eliminating the dispersive part of the diffracted signal[67]. According to Eq.…”

Wideband radio frequency spectrum analyzer: improved design and experimental results

“…ðA:16Þ This is the well-known photon echo situation that leads to optimal spectral resolution by eliminating the dispersive part of the diffracted signal [21]. According to Eq.…”