There is a divided type of substances that is called semiconductors. In the first time that unique type was found in the 1890's but more completely it started to be researched only after the First World War in Europe and in Soviet Union. Russian physicists performed a lot of experiments. The results demonstrated that semiconductors may help to accelerate the fluctuations and maintain them. During several years diodes were ejected by tubes. First transistor was developed in Bell's laboratory in 1949. This event impacted on the quick development of semiconductor devices. Since then a lot of people all over the world become interested in such type of substance as semiconductors.
Stimulated emission is really a very interesting feature of semiconductors that has been researched for several tens of years. First laser system was developed with usage of semiconductors. The first version was based on p - n barriers, the latest ones - on heterojunction.
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