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 ⁷F₀–⁵D₀ transition of Eu³⁺:Y₂SiO₅, which yields a total memory capacity of 1.6 kbits in a single spot of 240-μm diameter. The keys to the success of this experiment are this material’s long dephasing time and lack of spectral diffusion.

© 1991 Optical Society of America

Nonlinear laser spectroscopy of Eu³⁺:Y₂SiO₅ and its application to time-domain optical memory

Ryuzi Yano, Masaharu Mitsunaga, and Naoshi Uesugi
J. Opt. Soc. Am. B 9(6) 992-997 (1992)

Ultralong optical dephasing time in Eu³⁺:Y₂SiO₅

Ryuzi Yano, Masaharu Mitsunaga, and Naoshi Uesugi
Opt. Lett. 16(23) 1884-1886 (1991)

248-Bit optical data storage in Eu³⁺:YAlO₃ by accumulated photon echoes

M. Mitsunaga and N. Uesugi
Opt. Lett. 15(3) 195-197 (1990)

Coherent saturation removal in time-domain optical memory by storage of frequency-chirped data pulses

X. A. Shen and R. Kachru
Opt. Lett. 18(22) 1967-1969 (1993)

Coherent time-domain data storage with a spread spectrum generated by random biphase shifting

Y. S. Bai and R. Kachru
Opt. Lett. 18(14) 1189-1191 (1993)