Basics of a complete laser system

Course Details

Field of Study: Electronics Engineering
Course Name: Optoelectronics
Subtitle: Basics of a complete laser system

The gain medium is pumped by some method.
Some of the atoms/molecules are excited.
Spontaneous emission occurs, in all directions.
Emission along long axis of cavity is reflected back through the gain medium.
The spontaneously emitted photons stimulate further emission from the medium.
A large radiation density quickly builds up.
One of the mirrors is usually partially transmitting to allow some of the laser radiation to escape.

laser-medium

The three components required for laser action are:
A gain medium which can support a population inversion.
An external exciter to create the population inversion in the gain medium.
An optical resonator or cavity to create a high radiation density.

resonator

The various types of lasers differ in the types of gain medium, external exciter and size and type of cavity employed.

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