Semiconductor Laser

A semiconductor laser converts electrical energy into light. This is made possible by using a semiconductor material, whose ability to conduct electricity is between that of conductors and insulators.

5-25-08-laser-disc

By doping a semiconductor with specific amount of impurities the number of negatively charged electrons or positively charged holes can be changed.

Such lasers consists of 2 basic components- 1) An OPTICAL AMPLIFIER and
2) A RESONATOR.

The amplifier is made from direct bandgap semiconductor material based on either GaAs(Galium Arsenide) or InP(Indium Phosphide) substrates .

These are compounds based on the group III and group V elements in the periodic table. Alloys of these materials are formed onto the substrates as layered structures containing precise amounts of other materials.

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