Abstract
The population inversion by optical adiabatic rapid passage (ARP) has been observed, for the first time, in a solid, ruby, under a linear frequency chirping using Stark effect. In addition to the emission after ARP, the phase-inverted optical free induction decay(fid) signals indicating population inversion were observed and used to measure the degree of population inversion precisely. The experimental results were compared with Horwitz's calculation and numerical solutions of Bloch equations with relaxation terms. The decay of the population inversion was also measured.
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