Laser diode
part · 1962 · Digital age
A semiconductor laser.
Principles and materials it uses
- P–n junction — uses. A p–n junction emits the light.
- Gallium arsenide — is made of. Laser diodes.
Where it is used
- Lidar — is part of. Laser pulses.
- Optical disc (CD/DVD) — is used in. Read by a laser.
- Laser printer — is part of. A laser draws the image on the drum.
- Barcode — is used in. Barcode scanners use lasers.
- Optical fibre — is used in. The source is a laser.
- DVD — is used in. It is read by a red laser.
What it is a kind of
- Laser — is a kind of. A semiconductor laser.