Momentum Gaps and Laser Stability
Gaps that appear, through resonant interactions, in the dispersion relation of a particle or guided wave have had a rich history in areas of physics ranging from the study of solids to that of guided wave phenomena. Kogelnik and Shank1 first outlined and applied the concept to laser structures and coined the term distributed feedback (DFB) to describe lasing near a Bragg resonance. DFB lasers have found applications in many areas of optics and optoelectronics, particularly those that require single-mode, narrow linewidth operation.
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