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Chapter 1 Basics of Semiconductor Lasers

What are the basic of semiconductor lasers?
Semiconductor lasers are solid-state lasers based on semiconductor gain media, where optical amplification is usually achieved by stimulated emission at an interband transition under conditions of a high carrier density in the conduction band.
What is the basic principle of semiconductor laser?
Principle: When a p-n junction diode is forward biased, the electrons from n – region and the holes from the p- region cross the junction and recombine with each other.
During the recombination process, the light radiation (photons) is released from a certain specified direct band gap semiconductors like Ga-As.
What is considered the first semiconductor laser?
In September 1962 researchers from IBM, independently and almost simultaneously with researchers from General Electric and MIT's Lincoln Laboratory, demonstrated laser action in the semiconductor gallium arsenide.
General Electric researcher Robert Hall developed one of these lasers in 1962.
The Working Principle of Semiconductor Laser
These holes and electrons attract each other, and when they collide, they emit recombination radiation.
The energy of radiation emitted is equal to the energy band gap of the material, which is the energy differential between the conduction and valence bands.

What are the basic of semiconductor lasers?