11 OpticalCavities corrrected 2010

11 OpticalCavities corrrected 2010 - Properties of Cavities...

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Properties of Cavities All lasers consist of a gain medium and a cavity to produce optical feedback into the gain medium. The gain medium of a semiconductor laser is provided by the light emitting region of our device. The cavity is formed by the active region waveguide and mirrors that reflect the light back and forth through the gain medium. In this next few lectures we are going to discuss the conditions for laser operation and the lasers characteristics. To do so we need first to understand the general characteristics of optical radiation so that terms like density of modes , spontaneous emission, stimulated emission, and population inversion in a semiconductor are meaningful. I Mirror
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Density of Modes in a Cavity One Dimensional Cavity Consider a one dimensional cavity consisting of two infinitely big, perfectly reflecting and parallel mirrors separated by a medium of length, a, and index of refraction, n r .
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