A laser diode is a semiconductor device that emits coherent light when an electric current passes through it, widely used in applications such as telecommunications, barcode readers, and laser pointers. It operates on the principle of stimulated emission, similar to other types of lasers, but is compact and efficient, making it ideal for integration into small electronic devices.

Laser Diode

laser diode

A semiconductor device is like a magic switch that helps control electricity in all the cool gadgets we use, like phones and computers. It can turn electricity on and off, making things work or stop, just like a light switch in your home.

semiconductor device

Coherent light is a type of light in which the waves maintain a constant phase relationship, allowing them to interfere constructively or destructively. This property is essential for applications like lasers, holography, and optical communications, where precise control over light is required.

coherent light

Electric current is the flow of electric charge through a conductor, typically measured in amperes. It is a fundamental aspect of electricity, enabling the operation of electrical devices and the transmission of power across distances.

electric current

Telecommunications is the transmission of information over significant distances by electronic means, enabling communication between individuals, businesses, and governments across the globe. It encompasses a wide range of technologies, including telephones, radio, television, and the internet, playing a crucial role in modern society by facilitating instant communication and data exchange.

telecommunications

barcode readers

laser pointers

Stimulated emission is a process where an incoming photon induces an excited electron to drop to a lower energy level, emitting a second photon with the same phase, frequency, polarization, and direction as the incoming photon. This principle is fundamental to the operation of lasers, where it leads to the amplification of light.

Your Lessons