Abstract
We investigated the evolution of spectral intensity of the composite signal (Stokes (ES) + fluorescence (FL)) by varying time delay in different phases (tetragonal (T), hexagonal (H), (T + H) and (H + T)) of Eu3+:YPO4 and Pr3+:YPO4. In a composite signal, there exists a competition between FL and ES that can be modulated through dressing effect. We observed that dressing effect has strong dependence on dipole moment, transition probability and phase symmetry of atomic like media. The dressing suppression dip in H- and T-phase YPO4 is relatively weaker than mixed (H + T)-phase YPO, while the dressing effect is weaker in Eu3+:YPO4 as compared to Pr3+:YPO4. By adjusting the time delay, FL signal can be switched from suppression dip to enhancement peak and vice versa. Further, we explored intensity-difference squeezing and intensity-noise correlation between composite signal (FL + ES) and anti-Stokes under nonlinear phase modulated by time delay. Based on our spectral intensity results, we realized the model of dressing based switch.
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