Hello!

Let us learn working of semiconductor laser.

Working :

• A semiconductor diode laser is a device that produce a single light from a semiconductor material called gallium arsenide (GaAs).

• When the current is applied the electrons are introduced from n-type and the holes are introduced from p-type into the junction.

• The photons are reflected back and forth between two ends of the p-n junction.

• Population inversion takes place at higher energy band and when electron fall back at lower energy band it emits light through the polished and of the laser.

• Cross reflection of light takes place which multiply is the strength of the laser beam.

• Thus a laser beam is emitted from one end of the p-n junction.