The core of the single-mode laser is relatively thin, the beam quality is better than multimode, the energy distribution is Gaussian, and the intermediate energy density is the highest. The three-dimensional map is a sharp mountain shape.
The core of a multimode laser is coarser than that of a single mode. The energy distribution is smaller than that of a single mode. The three-dimensional image is an average of a single-mode spot. The three-dimensional image is an inverted cup. From the edge steepness, the multimode ratio The single mode is steep.
Videos – SM/MM Laser
650nm 30mW Single Mode Fiber Coupled Laser Video