Abstract

We report what is to our knowledge the first experimental observation of two- and three-pulse echoes in ${\mathrm{Er}}^{3+}$:YAG at $1.527 \mathit{\mu }\mathrm{m}$. The experiment was performed on the transition from the ${{}^{4}I}_{15/2}$ ground state to the lowest Stark level of the ${{}^{4}I}_{13/2}$ excited state. The corresponding homogeneous dephasing time was measured to be approximately 50 ns at 1 and 7 K. In addition, three-pulse echo decay indicated a lifetime of the spectral grating of $\sim 30 \mathit{\mu }\mathrm{s}$. Implications of these results for optical data storage and optical signal processing are discussed.

© 1997 Optical Society of America

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