基于Dini级数展开,导出了p(>0)阶准离散Hankel变换(the pth-order quasi-discrete Hankel transform based on Dini series expansion,pDQDHT)算法,并给出了该算法在光束传输中的应用.通过不同输入函数分别对pDQDHT算法进行测试及光束通过透镜传输的应用实例,结果表明:pDQDHT算法不仅精度高于现有的Hankel变换算法,可以进行多次正、逆变换,能广泛应用于光束分步传输问题,而且执行速度也与一般的快速Hankel变换算法相当.
By using semiclassical theory combined with multiple-scale method, we analytically study the linear absorption and the nonlinear dynamical properties in a lifetime broadened Λ-type three-level self-assembled quantum dots. It is found that this system can exhibit the transparency, and the width of the transparency window becomes wider with the increase of control light field. Interestingly, a weak probe light beam can form spatial weak-light dark solitons. When it propagates along the axial direction, the soliton will transform into a steady spatial weak-light ring dark soltion. In addition, the stability of two-dimensional spatial optical solitons is testified numerically.
