Semiconductors are considered to be a special class of chemical elements. In the first time this unique class was discovered in the 1890's but more completely it began to be researched only after the First World War in Europe and in Soviet Union. The first successful experiment was carried out by the Russian scientists in 1923. They proved that semiconductors may be utilized to accelerate fluctuations. But such devices as igct which are utilized nowadays were invented considerably later. Only in the beginning of the 60's with the appearing of transistors in 1949 the wide usage of crystal detectors began. That was the start of the epoch of semiconductor technologies.
Stimulated emission is actually a quite interesting feature of semiconductors that has been researched for several tens of years. It caused the appearing of semiconductor laser system based on usage of p - n barriers and then on heterojunction.
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