We have measured the optical dephasing time of Er3+ transitions near 1.5 µm 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 55kG, with dephasing times as long as 580 µs (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 4I13/2 level.
© 1997 Optical Society of America
R. M. Macfarlane, T. L. Harris, Y. Sun, R. L. Cone, and R. W. Equall, "Measurement of photon echoes in ErY2SiO5 at 1.5 µm with a diode laser and an amplifier," Opt. Lett. 22, 871-873 (1997)