Abstract
We observed quantum interference effects in steady-state optical absorption in a $V$-type three-level system of ${\mathrm{Pr}}^{3+}:{\mathrm{YAlO}}_{3}$ where a hyperfine transition between two upper levels was homogeneously broadened by pure dephasing. This $V$-type system was excited by a single driving radio-frequency (rf) field and two probe laser fields (quantum-beat scheme). The probe absorption was constructively or destructively affected by the phase of the driving rf field. In contrast, under two-laser excitation without application of the rf, no absorption change due to electromagnetically induced transparency (EIT) was observed. A comparison of observations and theoretical predictions revealed that the quantum-beat scheme generates quantum interference even when the dephasing rate between the two upper levels is comparable with the Rabi frequency of the probe laser, and completely destroys EIT.
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