Multiplexing recording in nickel-ion-doped photopolymer material for holographic data storage applications

Abstract

In the present study, a series of holographic gratings were recorded in a single location of nickel-ion-doped photopolymer film using different methods of multiplexing. The uniformity of their diffraction efficiency was shown to improve by using an exposure time scheduling method for holographic recording. Thirty-five gratings were recorded in the 130 μm thick photopolymer material with M#=6.18 and an average diffraction efficiency of 3.24% using peristrophic multiplexing. In the next step, a combination of peristrophic and angular multiplexing was used for storing 50 gratings in the material with a dynamic range of 7 and a mean diffraction efficiency of 2.15%.

Combination Compensation Method to Improve the Tolerance of Recording Medium Shrinkage in Collinear Holographic Storage

“…For example, the commonly used photopolymer, which has the advantages of high photosensitivity, a wide dynamic range, good optical properties, low cost, etc. [23][24][25], would encounter the shrinkage [15,[17][18][19][20] and the volume changes induced by varying the temperature [21,22,26]. The dimension change can result in changes in the holographic gratings that have been stored in the medium and lead to Bragg mismatch [26] and a decrease in diffraction efficiency [26][27][28].…”

Holographic Characteristics of Photopolymers Containing Different Mixtures of Nematic Liquid Crystals

“…Photopolymers are a type of holographic recording material that are used in many optical applications due to their flexibility, low cost, and easy preparation [1,2,3,4,5,6]. In these materials, different physical properties must usually be optimized, for example, energetic sensitivity to decrease the energy required during the recording process, spectral sensitivity to select a specific wavelength, or the spatial frequency to obtain high fidelity in the reconstruction of the hologram [7,8].…”