Compared with the photoelectric analog galvanometer, the installation of the grating requires a larger space, so the encoder part at the bottom of the grating digital galvanometer is higher than that of the photoelectric analog galvanometer. The grating digital galvanometer is more stable than the photoelectric analog galvanometer, and has a smaller drift subject to temperature changes.
The laser galvano mirror is simply a scanning galvo mirror used in the laser industry, and its professional term is called a high-speed scanning galvo mirror.