用时间延迟方法压低喇曼增强非简并四波混频谱的热背底

Reduction of Thermal Background of RENFWM Spectrum by Time-Delayed Method

证明了使用时延方法可再现淹没在热背底中的喇曼信号，并且喇曼增强非简并回波混频光谱恢复为通常的带有源于分子取向栅非共振背底的非对称线型．实验结果与理论予示一致．

e demonstrate that with the time-delayed mathod the Raman-resonance hidden in the thermal background can be revealed and the Raman-enhanced nonlegenerat6 four-wave mixing spectrum converts to a normal asymmetric lineshape with foe nonresonant background originating from the molecular-reortenactional grating. The experimental results are in good agreement with the theoretical predictions.