Comparison of transmission and the 90-degree holographic recording geometry

Yang, Yongsheng; Adibi, Ali

doi:10.1364/ao.42.003418

Cited by 14 publications

(5 citation statements)

References 30 publications

(44 reference statements)

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“…In In order to show the dispersion effect of the grating material, we assume that the grating is recorded in a photorefractive with the dispersion effect of the LiNbO 3 crystal calculated from equation (11). We can obtain that the wavelength selectivity becomes stronger with considering the dispersion effect from the expression of the Bragg mismatch parameter K. As a result, more wavelength components in the spectrum of the input UPB can not be diffracted effectively by the overlapping grating, which means that the input UPB is broadened in temporal domain after been diffracted by the VHG with the dispersion effect of the crystal.…”

Section: Numerical Simulationsmentioning

confidence: 99%

“…Moreover, the two beams involved in grating recording or reconstruction may access two orthogonal surfaces (typically called the 90 geometry [11] ). Although many researchers have analyzed the diffraction characteristics of the finite size planar holographic gratings under continuous wave (CW) readout [12][13][14][15][16] , for the case that the finite size VHG is illuminated by a UPB, and the grating material dispersion is been considered, few studies have touched upon as we knew.…”

Section: ． Introductionmentioning

confidence: 99%

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Diffraction characteristics of volume holographic gratings with finite size for the ultrashort pulsed beam readout

et al. 2006

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Using the two-dimensional coupled-wave theory, the diffraction characteristics of volume holographic gratings (VHGs) with finite size planar are studied for the ultrashort pulsed beam (UPB) readout. Numerical simulations are show for the special case of the overlapping VHGs reconstructed by a Gaussian-shaped UPB in temporal domain. The effects of the material dispersion and the finite size of the grating on the intensity distributions of the diffracted and transmitted pulsed beams, and the total diffraction efficiency are given. Our study also shows the differences between the diffraction characteristics of the finite size planar VHG for the UPB readout and those for the CW readout. And, comparison of the diffraction characteristics between the finite size VHGs and the one dimensional VHGs under the UPB readout is given. 1． IntroductionVolume holographic gratings (VHGs) have been widely used in many fields, such as information storage, processing, and display, and for optoelectronic devices such as waveguides and filters [1][2][3] , because of its characteristics of high diffraction efficiency, wavelength selectivity, and angular selectivity. Recently, the remarkable progress of the technique to generate ultrashort pulsed beams (UPBs) has extended the bandwidth of optical communications and signal processing.With which, VHGs have attracted increasingly more attention in manipulating the laser output pulses to achieve functional waveforms with large bandwidths which can be utilized in a variety of applications because of their flexibility and the possibility of using them to implement dynamic processing [4][5][6][7][8][9] . Based on the coupled wave theory of Kogelnik [10] , Y. Ding [8] et al. have shown both theoretically and experimentally that in the frequency domain it is possible to achieve an enough large diffraction bandwidth of the one dimensional(1-D) VHG for the bandwidth of 100-fs pulses. Further, the study of Teng [9] has included the dispersion effect in the crystal.However, there is no doubt that in some of the applications of VHGs only two dimensions are of interest, where the size of the VHGs in the two dimensional (2-D) plane in which the grating vector lies is restricted. Moreover, the two beams involved in grating recording or reconstruction may access two orthogonal surfaces (typically called the 90 geometry [11] ). Although many researchers have analyzed the diffraction characteristics of the finite size planar holographic gratings under continuous wave (CW) readout [12][13][14][15][16] , for the case that the finite size VHG is illuminated by a UPB, and the grating material dispersion is been considered, few studies have touched upon as we knew. Actually, the

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Section: Numerical Simulationsmentioning

confidence: 99%

Section: ． Introductionmentioning

confidence: 99%

Diffraction characteristics of volume holographic gratings with finite size for the ultrashort pulsed beam readout

et al. 2006

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“…When a LiNb0 3 crystal is used, two holographic recording geometries are usually utilized: the 90-degree and transmission geometry. Although the attainable dynamic range (M/#) is much higher in the transmission geometry [9], but the scatter noise is much lower in the 90-degree geometry. Therefore, a 90-degree Fourier defocusing geometry is adopted in our miniaturized system (Fig.…”

Section: Background and Introductionmentioning

confidence: 97%

Miniaturized volume holographic optical data storage and correlation system with a storage density of 10 Gb/cm3

Cao¹

2004

Chinese Sci Bull

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The general idea of holographic optical data storage (HODS) is briefly introduced. Based on the recent advances of HODS, the key techniques and the challenges of HODS are discussed. Some new techniques are proposed to improve the system. A miniaturized volume holographic data storage and correlation system is presented. It can achieve a density of 10 Gb/cm 3 and a fast correlation recognition rate of more than 2000 images per second. It shows the attracting potential advantages over other conventional storage methods in the information storage as well as information processing.

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“…For example, typical sensitivity obtained in LiNbO 3 :Fe:Mn crystals is 0.01cm/J with o-polarized 633nm light recording and 404nm light sensitizing 5 . For practical applications, the recording sensitivity is one of three important performances which measuring in holographic storage, and the larger values of sensitivity are required 6 .…”

Section: Introductionmentioning

confidence: 99%

Investigation for the high recording sensitivity with two center recording in LiNbO 3 :Fe:Ru crystals

et al. 2006

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LiNbO 3 :Fe:Ru crystal is the effective recording media with high recording sensitivity for two-center recording, and the physical mechanism for the high recording sensitivity is investigated theoretically and experimentally. The results show that the energy level of Ru perhaps is closer to that of Fe than that of Mn in LiNbO 3 crystal, the electrons in Ru center can be excited more effectively into the conduction band in the same sensitizing conditions, which can induce the improvement of the recording sensitivity. The recording sensitivity 0.044cm/J in LiNbO 3 :Fe:Ru crystal, which is ten times larger than that obtained in LiNbO 3 :Fe:Mn reported early. However, the elevation of energy level of deep center will induce that the electron excitation from deep center by the recording light become more effective, and the persistence decreases with the recording sensitivity increase, the grating in Ru center can be erased by red light obviously.In practical application people must take a trade off between the recording sensitivity and persistence.

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Comparison of transmission and the 90-degree holographic recording geometry

Cited by 14 publications

References 30 publications

Diffraction characteristics of volume holographic gratings with finite size for the ultrashort pulsed beam readout

Diffraction characteristics of volume holographic gratings with finite size for the ultrashort pulsed beam readout

Miniaturized volume holographic optical data storage and correlation system with a storage density of 10 Gb/cm3

Investigation for the high recording sensitivity with two center recording in LiNbO 3 :Fe:Ru crystals

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