Vertical-cavity surface-emitting laser

The vertical-cavity surface-emitting laser (VCSEL ) is a type of semiconductor laser diode with laser beam emission perpendicular from the top surface, contrary to conventional edge-emitting semiconductor lasers (also called in-plane lasers) which emit from surfaces formed by cleaving the individual chip out of a wafer. VCSELs are used in various laser products, including computer mice, fiber-optic communications, laser printers, Face ID, and smartglasses.

Source: Wikipedia — Vertical-cavity surface-emitting laser (CC BY-SA 4.0)