Transverse Inhomogeneous Carrier-Envelope Phase Distribution of Idler Generated through Difference-Frequency-Generation

The transverse inhomogeneous carrier-envelope phase （CEP） distribution of idler generated through difference-frequency-generation （DFG） in quadratic nonlinear crystals is theoretically studied. In practical CEP stabilized DFG setups, the pump and the signal are usually Gaussian beams with non-uniform intensity distribution. Since the idler CEP is dependent on gain, this non-uniform intensity distribution leads to inhomogeneous gain across the aperture of the idler beam, resulting in a varying transverse idler CEP. Simulation results show that in practical settings, in the high-gain regime, transverse inhomogeneous CEP can be much smaller compared with π/2. However, when gain on the propagation axis reaches saturation, CEP difference can well exceed π/2.     

海底管道铺设分析的子结构方法

深水S型铺管涉及三维空间的大变形和接触分析,由于收敛速度慢而导致求解困难.为克服这个问题,本文提出了一种子结构方法;通过凝聚托管架内部结点自由度,铺管问题可在二维空间表述和求解.本文方法具有快速收敛的特点,可对铺管问题进行广泛的参数研究.