Time- and frequency-domain hybrid optical memory: 16-kbit data storage in Eu^3+:Y_2SiO_5

Abstract

We propose and demonstrate a novel type of frequency-selective optical memory that writes and reads the data in both the time domain and the frequency domain. Temporal 16-bit data were stored by accumulated-photon-echo bit-by-bit storage at 103 frequency addresses within the inhomogeneous line of the (7)F(0)-(5)D(0) transition of Eu(3+):Y(2)SiO(5), which yields a total memory capacity of 1.6 kbits in a single spot of 240-microm diameter. The keys to the success of this experiment are this material's long dephasing time and lack of spectral diffusion.

Direct Preparation of Y2SiO5Nanocrystallites by a Microwave Hydrothermal Process

“…During the microwave hydrothermal process illustrated in Figure 6, Y 2 (SiO 3 ) 3 and Y(OH) 3 will be generated in the early period in the reaction. According to Wang et al [13] Fang et al [14], and Leskelä and Jyrkäs [15], the formation of Y 2 SiO 5 crystallites is considered as a three-step process from the observation of the SEM.…”

“…Y 2 SiO 5 : Tb 3+ is one of the best green emitting cathodoluminescent phosphors [1,2]. Y 2 SiO 5 : Eu 3+ was found to be a promising candidate for coherent time-domain optical memory (CTDOM) applications [3]. Due to its high melting point, low evaporation rate, equivalent thermal expansion coefficient, and low oxygen permeation constant [4], yttrium silicates is considered as one of the best antioxidation coating for C/C composites [5][6][7].…”

Nuclear quadrupole resonance of an electronically excited state from high-resolution hole-burning spectroscopy

“…2,3 The population modifications introduced in this spectroscopic technique also form a basis for applications of these materials in optical storage 2 and signal processing. 4 Experiments like these provide information about the energy-level structure and the populations of nuclear spin states.…”

Photon-echo-based logical processing

“…[1][2][3][4][5][6][7][8] that demonstrate various aspects of optical data storage and processing through the use of photon echoes have recently appeared. Together with persistent spectral holeburning (e.g., Refs.…”

“…For these energies the homogeneous dephasing time T 2 (E) is -20 tZs. 1 6 Thus the output signal in Fig. 3 is attenuated by approximately a factor of exp[4 X 12/T 2 (E)] = 10 as a result of homogeneous dephasing.…”