Shift selectivity of the collinear holographic storage system

Shimura, Tsutomu; Ichimura, Shotaro; Ashizuka, Yasushi; Fujimura, Ryushi; Kuroda, Kazuyuki; Tan, Xiaodi; Horimai, Hideyoshi

doi:10.1117/12.685218

Cited by 10 publications

(2 citation statements)

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“…Shift selectivity links the Fourier spectrum of a reference beam and is independent of the thickness of recording media. 29,30) Figure 7 shows the shift selectivity of the proposed method using 1:25w aperture and the conventional method using 1:25w one. Amount of shift of local minimal intensity values are in good agreement because the reference ring is common in both the proposed and conventional methods.…”

Section: Shift Selectivitymentioning

confidence: 99%

Coaxial Holographic Memory with Designed Reference Pattern on the Basis of Nyquist Aperture for High Density Recording

Nobukawa

Nomura

2013

Jpn. J. Appl. Phys.

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We propose the designed reference pattern on the basis of the Nyquist aperture for a coaxial holographic memory and investigate its recording performance by numerical simulations. By using the designed reference pattern, the Fourier power spectrum of a reference beam spreads uniformly within the Nyquist aperture, thereby an interference efficiency, a signal-to-noise ratio (SNR) and a symbol error rate (SER) are improved relative to conventional method with a random binary phase mask. Moreover, in the case of applying the 1.25 times aperture than the Nyquist size, the proposed method can record data pages with higher SNR and lower SER than that of conventional method with 2 times aperture than the Nyquist size. Numerical results imply that our proposed method can record data pages at a smaller area of recording media than that of conventional method.

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Section: Shift Selectivitymentioning

confidence: 99%

Coaxial Holographic Memory with Designed Reference Pattern on the Basis of Nyquist Aperture for High Density Recording

Nobukawa

Nomura

2013

Jpn. J. Appl. Phys.

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“…For this reason, the signal-to-noise ratio of the data decreases with the shift distance. 4) Secondly, the hologram thickness is restricted to within several hundred microns, 3,5) since a highnumerical-aperture (NA) lens focuses the signal and reference beams onto a spot. Although the dynamic range (M/#) of the medium increases in proportion to its thickness, the effect of the thickening of the medium on M/# is also limited to the range of several hundred microns.…”

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confidence: 99%

Multilayer Holographic Storage Using Coaxial Optical Systems

Minabe¹,

Ogasawara²,

Yasuda³

et al. 2008

jjap

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We develop the derivation we proposed in [37] of the dressing phase of the S-matrix in the AdS/CFT correspondence in the framework of the underlying bare integrable model. We elaborate the configuration of the Bethe roots describing the physical vacuum, which consists of a long Bethe string stretched along the imaginary axis and stacks distributed along the real axis. We determine the distribution of all Bethe roots in the thermodynamic limit. We then directly compute the scattering phase of the fundamental excitations over the physical vacuum and reproduce the BHL/BES dressing phase. JHEP12(2007)044so that it satisfies the crossing symmetry [13] and includes the previously known first two terms [14 -17] which reproduce the semi-classical string spectrum. Subsequently, a systematic way of its determination as the weak coupling expansion was presented [18]: The problem can be rephrased in terms of the cusp anomalous dimension [19] where the transcendentality principle [20], with some empirical rules, fully determines the dressing phase up to an overall multiplicative constant. The constant is readily singled out by comparison with either the perturbative computation [21] or the strong coupling result [12]. Ultimately the weak coupling result is identified with the strong coupling one by a sort of analytic continuation [18,22] and is nicely expressed in a closed integral formula. We call it the BHL/BES dressing phase after the authors of the articles [12,18]. Its properties, such as the pole structure [23] as well as the strong coupling limit [24 -27], have been further studied.Despite the success in the determination, the clear understanding of the scalar factor was still lacking. The above procedures do not explain why the scalar factor should exhibit its particular structure. It is also unsatisfactory that these procedures require some modelspecific computation of the string/gauge theory. Although there are some interesting results explaining part of its structure [23, 28 -30], one would desire a comprehensive explanation.Let us recall here that in the field of integrable models, there are two well-known approaches for the computation of the S-matrices: One is called the factorized bootstrap program or the phenomenological computation [31], the other is called the direct calculation, the microscopic derivation or the Bethe ansatz technique [32 -34].The former approach is to compute the S-matrices as an inverse problem. In twodimensional massive relativistic integrable models, two-body S-matrices of the fundamental particles satisfy the unitarity, the factorizability, and the crossing symmetry. These conditions constrain the form of the S-matrices up to the CDD ambiguity. The ambiguity can be removed by some additional requirements, such as the absence of the poles corresponding to unphysical particles.The latter approach is to compute the S-matrices as a direct problem. For example, in the anti-ferromagnetic Heisenberg spin-chain the physical vacuum is the anti-ferromagnetic state rather than the ferromagnetic ...

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Shifting selectivity of collinear volume holographic storage

Teng

Hsieh

et al. 2010

Optics Communications

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Shift selectivity of the collinear holographic storage system

Cited by 10 publications

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Coaxial Holographic Memory with Designed Reference Pattern on the Basis of Nyquist Aperture for High Density Recording

Coaxial Holographic Memory with Designed Reference Pattern on the Basis of Nyquist Aperture for High Density Recording

Multilayer Holographic Storage Using Coaxial Optical Systems

Shifting selectivity of collinear volume holographic storage

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