Contents I. Introduction
There are various applications that require high-power and broadband light sources in the visible or near-infrared wavelength range, for example certain RGB projection systems, machine vision systems or optical coherence tomography (OCT) systems, where semiconductor-based SLED sources are preferred light sources due to their high spatial coherence, which allows for efficient coupling to single-mode waveguides and fibers, and due to their broad emission spectrum, which eliminates coherent speckle noise or which allows for high imaging resolutions. Some of those systems need to illuminate larger areas such that higher power levels of a few 100 mW are required, while maintaining lateral single-mode.
