(a) Why do semiconductor light emitting diodes have a characteristic emission line width on the order of hundreds of Angstroms while semiconductor lasers have line widths ∼ 1 A?˚
(b) In order to produce a semiconductor laser, what two conditions basic to
the gain mechanism must be satisfied?
(c) To what extent is the light output of a semiconductor laser collimated?
(Give a typical divergence angle.) What can be done to produce greater
collimation?
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