Abstract
We demonstrate optical coherent transients in a -like hyperfine energy-level system of in yttrium orthosilicate () 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 -like system. Further, the pulse area dependence of photoluminescence (PL) from the -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 . 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 in solids at zero magnetic field. These findings will facilitate optical coherent manipulation of -like electronic states as a quantum memories operating at telecom-band wavelengths.
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