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The behavior of the ground-state hyperfine coherence formed in coherent population trapping (CPT) is studied. Using potassium atoms cooled with a magneto-optical trap, a pure hyperfine CPT state was prepared in a magnetic field, and hyperfine coherent effects in an open system were experimentally studied with off-Raman resonance oscillations (ORRO). Comparisons were made to full numerical simulations and to a pseudo-three-level model. The frequency and phase of ORRO can be manipulated by changing the relative frequency and phase of the lasers.
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Gu et al. (2003) studied this question.
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