研究了液芯波导中受激拉曼散射和受激动力学散射的阈值随泵浦激光脉宽的变化，发现受激动力学散射的阈值随泵浦脉冲前沿增长率增大而下降。研究了受激动力学散射和受激拉曼散射的竞争，结果表明受激动力学散射可分解为两种成分，其中与瞬态泵浦功率密度增长率相关的成分在大于阈值的泵浦脉冲前沿处于竞争优势，与瞬态泵浦功率密度相关的成分在高泵浦功率密度处于竞争优势，并讨论了其相应的机制。 The thresholds of stimulated Raman scattering and stimulated dynamic scattering in liquid crystal waveguides are studied with the change of the pulse width of the pump laser. It is found that the threshold of stimulated dynamic scattering decreases with the increase of the pump pulse frontier. The competition between stimulated and stimulated Raman scattering was studied. The results show that stimulated dynamic scattering can be decomposed into two components, of which the components related to the transient pump power density growth rate are at the front of the pump pulse larger than the threshold Competitive advantage. Components associated with transient pump power density are at a competitive edge in high pump power densities, and their corresponding mechanisms are discussed.