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In 1842, Johann Doppler delivered his paper on Doppler effect to Royal Bohemian Society. In his paper “On the Colored Light of Double Stars and Some Other Heavenly Bodies”, he arrived at the ...

Edge emitting and surface emitting lasers present two configurations for laser emission using semiconductors. Edge emitting lasers came first but were quickly replaced by surface emitting lasers for ...

Since the first demonstration of the laser in 1960, people have endeavored to make lasers more compact. Semiconductor lasers achieved this desired compactness employing so called heterostructures. This ...

Since the invention of the first operating laser in 1960, lasers have been designed in various regions of the electromagnetic spectrum and output powers. Soon after the advent of semiconductor fabrication ...