Focus Investigation behind Aspherical Lens

High-power laser diodes often show asymmetric divergence and astigmatism between two directions. As an example, a laser diode is firstly collimated by an objective, then focused by an aspherical lens, and the evolution of the field in the focal region is investigated in VirtualLab Fusion. The influence of the astigmatism on the field in its focal region is clearly presented, compared against to the case without astigmatism.