Abstract

We have measured the optical dephasing time of Er³⁺ transitions near $1.5 \mathit{\mu }\mathrm{m}$ in the two crystallographically inequivalent sites of Y₂SiO₅, using an external-cavity diode laser amplified by an erbium-doped fiber amplifier. Two-pulse photon echoes were observed at zero field and in magnetic fields up to 55 kG, with dephasing times as long as $580 \mathit{\mu }\mathrm{s}$ (corresponding to a linewidth of 550 Hz). Stimulated echoes were also measured and showed evidence of spectral diffusion during the 13-ms lifetime of the ${ }^4{I}_{13/2}$ level.

© 1997 Optical Society of America

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