Collimation of Astigmatic Diode Laser Beam by Objective Lens

Laser diodes are one of the most commonly used sources nowadays. High-power laser diodes often exhibit asymmetric divergence in two directions. They must be collimated in most applications. In addition to the divergence, such sources may also show astigmatism between two directions. In this example, collimation of an astigmatic laser diode is investigated with both ray tracing and field tracing techniques, and it is compared with a reference case without astigmatism.