Dynamic Optical Storage in LiNbO„ Crystals

I. B. Barkan, S. I. Marennikov, Matvey V. Entin

I. B. Barkan, S.I. Marennkov, M V Entin

Qiyin Fang, Jingjun Xu, Qian Sun +5 more

The storage application of the light-climbing effect in a LiNbO(3):Fe crystal has been studied experimentally. A new type of photorefractive storage in LiNbO(3):Fe crystals, in which one could write the multipage simultaneously and at a later time read out the multistored pages, using only one readout beam simultaneously, has been demonstrated successfully. Furthermore the signal-to-noise ratio of the output images was high because the climbing lights suppressed the fanning noise scattering lights.

Henri J. Rajbenbach, Sambath Bann, Jean‐Pierre Huignard

We propose and demonstrate a new long-term readout holographic memory using two photorefractive crystals. Images are stored in the first crystal and reconstructed with low-intensity beams, then amplified in the second crystal operating in a high-gain low-noise configuration. By using combinations of LiNbO(3)/Bi(12)SiO(20) and BaTiO(3)/Bi(12)SiO(20) as storage/amplification crystals, continuous readout of the angularly coded memories for more than 20 h and 40 min, respectively, is experimentally achieved. A lower bound for the index modulation to be allocated to one stored image in LiNbO(3)is estimated.

Theodore D. Holstein, S. K. Lyo, R. Orbach

Osamu Matoba, Bahram Javidi

We present the first, to our knowledge, demonstration of an encrypted optical storage based on double-random phase encoding by using angular multiplexing in a photorefractive material. Original two-dimensional data are encrypted by use of two random phase codes located in the input and the Fourier planes and are then stored holographically in a LiNbO(3):Fe crystal. The retrieval of the original data can be achieved with a phase-conjugated readout scheme. We demonstrate the encryption and the decryption of multiple frames of two-dimensional digital data by using angular multiplexing. We also evaluate numerically the influence of the bandwidth of the optical system on the decrypted digital data. The bit error rate as a function of the optical system bandwidth is presented.