Multispot laser photocoagulation system using a fiber bundle scanner

A multispot photocoagulation system equipped with a fiber bundle scanner is developed for the treatment of widely spread port wine stain. The laser transmission system consists of multiple quartz fiber, the input ends of which are aligned and driven by a stepper motor across a high-power argon laser beam. The output ends are arranged in a hexagonal close-packed array from which the diverging laser beam successively irradiates different spots of a lesion without the use of a mechanical scan over the lesion. The output patterns from two bundles of graded-index and step-index fibers are analyzed experimentally.