Abstract

We demonstrate optical coherent transients in a $\mathrm{\Lambda }$-like hyperfine energy-level system of ${{}^{167}\mathrm{Er}}^{3+}$ in yttrium orthosilicate (${\mathrm{Y}}_2{\mathrm{SiO}}_5$) with telecom-band photons at a zero magnetic field. Spectral hole burning was used to study the temperature dependence of the induced spectral antihole. We find that temperatures below 3.0 K suppress population dissipation induced by electron-phonon interactions sufficiently to enable population initialization in the $\mathrm{\Lambda }$-like system. Further, the pulse area dependence of photoluminescence (PL) from the $\mathrm{\Lambda }$-like system was measured at 2.2 K. An optical pump power dependence of PL intensity shows Rabi oscillations that contain two full Rabi cycles at the frequency of $2\pi \times 810\mathrm{kHz}$. A two-pulse photon echo measurement reveals an optical coherence time of 12 μs. To date, this measured optical coherence time is the longest observed for ${\mathrm{Er}}^{3+}$ in solids at zero magnetic field. These findings will facilitate optical coherent manipulation of $\mathrm{\Lambda }$-like ${{}^{167}\mathrm{Er}}^{3+}$ electronic states as a quantum memories operating at telecom-band wavelengths.

© 2019 Optical Society of America

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