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Molecular crystals and liquid crystals science technology. Section A, Molecular crystals and liquid crystals/Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals

Nondestructive Read-out of Two-color Photon-gated Spectral Holeburning Holograms

Daniel J. Reiss, Alexander Rebane, Urs P. Wild

Published May 1, 1998• 0 citations

Abstract

We recorded picosecond photochemically accumulated stimulated photon echo (PASPE) holograms by using two-color photon-gated persistent spectral hole- burning at liquid-helium temperature. Images stored using this technique have more than three orders of magnitude higher read-out stability compared with the one-color process. We used Zn-tetra-phenyl-tetrabenzoporphyrin in a polystyrene film with 20% hexachloroethan (C2Cl6) as recording material. The long lifetime of the triplet state allows the observation of a transient image prior to the fixation of the image. By restricting the green gating beam to a part of the transient hologram image on the polymer film, the photoreaction takes place only in the area illuminated with both colors, and this part of the image is stored permanently.

DOI: 10.1080/10587259808042473

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We recorded picosecond photochemically accumulated stimulated photon echo (PASPE) holograms by using two-color photon-gated persistent spectral hole- burning at liquid-helium temperature. Images stored using this technique have more than three orders of magnitude higher read-out stability compared with the one-color process. We used Zn-tetra-phenyl-tetrabenzoporphyrin in a polystyrene film with 20% hexachloroethan (C2Cl6) as recording material. The long lifetime of the triplet state allows the observation of a transient image prior to the fixation of the image. By restricting the green gating beam to a part of the transient hologram image on the polymer film, the photoreaction takes place only in the area illuminated with both colors, and this part of the image is stored permanently.

Spatio-temporal holography using persistent spectral hole-burning in dye molecules embedded in plastic films is promising for applications such as femtosecond pulse shaping, data storage or phase conjugation. In addition to the common 2 spatial dimensions of classical holograms, each point in the sample plane can be used to store spectral informations such as the shape of a femtosecond pulse. On each point of the sample, spectral interferences between a reference pulse and an object pulse (for example chirped) are recorded via spectral hole-burning in the absorption band of the dye molecule. As early as 1983, photon echo and time-reversal experiments using persistent spectral hole-burning were performed in porphyrazine styrol solutions at 630 nm [1]. Then several developments, like the reconstruction of the polarization state of object pulses [2], time and space holography [3,4], image holograms using a single pair of femtosecond pulses [5] were demonstrated in different photosensitive media.

Persistent spectral hole-burning (PHB) has been proposed as the essential element of a frequency domain optical storage system1 in which the frequency at which a hole is burned in an inhomogeneously broadened absorption line at low temperatures serves as an additional dimension for the storage of digital information. Essentially all of the mechanisms studied until recently have been single-photon mechanisms, i.e., the photoionduced change leading to hole-burning (writing) for a given center occurs with a certain fixed probability after the absorption of one photon. Such linear, monophotonic processes suffer from the drawback that the act of detecting holes (reading) can also produce changes in the absorption line. Recent modeling studies of the generalized single-photon process2 have shown that thousands to tens of thousands of reads can be obtained from single-photon mechanisms only when the material possesses high quantum efficiency and low absorption cross section. These restrictive requirements do not apply for photon-gated hole-burning mechanisms, i.e., those mechanisms for which hole-burning occurs only in the presence of an additional “gating” light source, because for these mechanisms, reading is performed in the absence of the gating light and is therefore nondestructive.

The stimulated photon echo memory using persistent hole-burning materials has been attracting much attention as a possible candidate for high-density data storage. Most studies have been related to the writing and reading processes and little attention has been paid for a partial erasing. We demonstrate for the first time that partial erasing of photon echo memory can be accomplished by simply employing a half-wave plate. In a photon echo memory, the write and data pulses with a time separation /spl tau/ excite a hole-burning material. These pulses create a periodic absorption modulation (periodic hole) with a frequency of l//spl tau/ in the absorption spectrum. When the read pulse excites the sample, a stimulated echo pulse is emitted at /spl tau/ after the read pulse, We note that a bit of data is stored as a periodic hole in the sample. A rotation of a half-wave plate inserted in the data pulse path (which induce a retardation of /spl lambda//2) creates two periodic holes that have the same frequency and opposite phase. Therefore, erasing a periodic hole can be done by rotating the wave plate. A dye (Sulforhodamin 640) doped polymer film (polyvinyl alcohol) cooled at 2 K was used as a persistent hole-burning material.