VCSEL (Vertical Cavity Surface Emitting Laser) - Inphenix Inc. https://www.inphenix.com/en/vertical-cavity-surface-emitting-laser-vcsel/ A VCSEL (vertical cavity surface emitting laser) is a surface-emitting #semiconductor light source which emits laser beams in a direction perpendicular to it’s top surface. Individual #VCSEL emitters are very small, typically around 10 microns in diameter, but collectively generate a much higher output power level. Vertical cavity surface emitting lasers (VCSELs) have been used for many different applications like LiDAR Systems, 3D Scanners, Proximity Sensors and Telecommunications.