利用腔共振效应提高非线性介质内光脉冲的相对延迟

Based on the transverse-phase modulation effect, we derived the analytical expressions of the relative delay and the group velocity of a sinusoidally modulated fundamental-mode Gaussian beam passing through a nonlinear medium within a thin resonant Fabry-Perot cavity. As an exemple, the dependences of the relative delay of the signal pulses transmitted through a ruby crystal on different parameters were disscussed. When the absorption coefficient of nonlinear medium is relatively small, the improvement of the relative delay, which is influenced by the cavity-mirror reflectivity, can be achieved by introducing an appropriate resonant cavity. For the case of ruby, the maximum relative delay increases 2.2 times when the cavity-mirror reflectivity is 0.79.