Laser Diode Overview
A laser diode is a semiconductor device that emits coherent light through stimulated emission of photons. It has a p-n junction that causes current flow when a forward bias is applied. Electrons and holes recombine in the intrinsic layer, releasing photons.
Applications of Laser Diodes
Laser diodes have many uses, including fiber optics, bar code scanning, laser printing, illumination, engraving, light shows, and robots. They offer precise control over laser power, rapid response, and precise beam focusing for cutting, engraving, and drilling.
How Laser Diodes Produce Light
A laser diode produces coherent light through stimulated emission of photons. It has a p-n junction that causes current flow when a forward bias is applied. The active region is intrinsic, where carriers are pumped from n and p regions. When current passes through a laser diode, electrons move between energy levels, emitting photons when returning to original states.