Laser scanning uses the distortion of laser lines to reconstruct and object. This technology is accurate down to a maximum resolution of 0.02mm. This method is limited by the use of markers to keep the scan aligned and takes more planning to get a good model. This process is great for small to medium sized parts that require high precision.
Near Infra Red scanning takes pictures of structured infra-red light to reconstruct an object. This technology is accurate down to around 0.1mm to 2mm. This method can align the scan based on the geometry of the object and does not require markers, though they can improve results. This process is great for medium to large sized objects.
Photogrammetry is similar to NIR Scanning but uses visible light. This method is great for larger objects of for objects where a detailed texture map is required. This method is also exceptional at scanning shiny objects that other techniques might struggle with by using cross-polarized light.