First-order model of the change with refractive index of the frequency of semiconductor lasers
The derivative with refractive index of the frequency of a spectral line of a diode laser is deduced from a model of the internal structure as a rectangular dielectric waveguide. It is found that the derivative depends critically on the spreading of the optical field beyond the guide walls. If the f...
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Veröffentlicht in: | Journal of applied physics 1983-11, Vol.54 (11), p.6190-6192 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | The derivative with refractive index of the frequency of a spectral line of a diode laser is deduced from a model of the internal structure as a rectangular dielectric waveguide. It is found that the derivative depends critically on the spreading of the optical field beyond the guide walls. If the field is strictly confined to the interior of the guide, the derivative depends on only the change of the index inside the guide, and it is negative. If the field extends appreciably outside the guide walls, the derivative depends on changes of the index outside as well as inside the guide, and it varies rapidly with guide design. For lasers operating in the fundamental spatial mode, its numerical value can be appreciably less than for a closely confined mode and its sign can be either negative or positive. Relating the results to frequency modulation of the fundamental mode laser suggests that its sign can change with dc bias, and also its magnitude. |
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ISSN: | 0021-8979 1089-7550 |
DOI: | 10.1063/1.331933 |