Growth
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The alternating layers of the two different semiconductors which form the quantum heterostructure may be grown on to a substrate using a variety of methods such as molecular beam epitaxy (MBE), metalorganic vapour phase epitaxy (MOVPE), or metalorganic chemical vapor deposition (MOCVD).
Read more about this topic: Quantum Cascade Laser
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—Ralph Waldo Emerson (1803–1882)
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—Joan Sheingold Ditzion and Dennie Palmer (20th century)