Semiconductors are the divided type of substances. People got known about these substances in the end of the 19th century, but only in the 20th century scientists managed to get more knowledge about them. Russian physicists carried out lots of experiments. The results showed that semiconductors can help to accelerate the fluctuations and maintain them. During further years diodes were ejected by tubes. First transistor was created in Bell's laboratory in 1949. This event influenced the quick development of semiconductor devices. Since then a lot of persons all over the world become interested in such type of matter as semiconductors.
Induced emission is actually a quite interesting feature of semiconductors that has been researched for several tens of years. By usage of such principles as p - n barriers and heterojunction physicists managed to design laser system in the beginning of the 60's.
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