High peak power first,second, and third order Stokes pulses based on intracavity self-stimulated Raman scattering lasers

<正>We obtain high peak power pulses in megawatt range of the first(1181 nm),second(1321 nm),and third order(1500 nm) Stokes radiation from self-conversion of the 1067-nm laser radiation based on Nd:KGW laser.The maximum output energy of the first order Stokes laser is 35.3 mJ,which is to our knowledge, the highest reported energy in an intracavity Q-switched laser.The third order Stokes pulse is obtained in an intracavity Q-switched laser.     

ρ-VOF:一种可清晰模拟自由界面的两相流方法

文章通过对EFM(effective field modeling)模型进行简化, 消除了原模型的非守恒性项和非双曲性特性项, 发展了一种基于密度的气液两相流模拟方法: ρ-VOF方法.利用体积分数信息对控制单元内的自由界面进行重构, 得到了控制单元内流体的空间分布, 并采用AUSM+-up格式获得考虑气液流体接触间断信息的对流通量.新方法可统一处理激波间断和接触间断的相互作用, 保持自由界面的尖锐性, 并且其计算量与自由界面的空间复杂度无关.最后, 数值模拟了液体激波管气液激波管和气体激波跨二维液滴传播等问题, 并与文献结果进行对比, 验证了本方法在气液两相流模拟中的准确性.