Smart glasses need compact, efficient displays that can produce detailed images without drawing too much power. Laser beam scanning is one approach to meeting these requirements. Rather than using a fixed array of pixels, these displays steer a laser beam across the field of view, building an image point by point. Higher-resolution images can be produced without increasing the size of the optical components by switching colors more rapidly while using a fast-scanning mirror. Current systems, however, face limits in how quickly and efficiently they can control laser color. To prod...