Quasi-conductors are believed to be a unique class of chemical elements. Such type was researched in early 1980's but there were no required technologies to carry on the further researches. The research of semiconductors was carried on just in the 1920's. In 1923 Russian physicists proved the ability of utilizing of semiconductor-metal contacts to accelerate the producing of fluctuations. There was no possibility to develop some unique devices as diodes. First transistor was created in Bell's laboratory in 1949. This event influenced the quick improvement of semiconductor devices. The intense studying of the features of semiconductors was begun at the same time.
Induced emission is really a very interesting feature of semiconductors that has been researched for several tens of years. It led to the appearing of semiconductor laser device based on usage of p - n barriers and then on heterojunction.
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