Cavity length effect on lasing mode of a dielectrically apertured Fabry-Perot microcavity

The lasing mode characteristics of planar and dielectrically-apertured one-wave and two-wave Fabry-Perot microcavities are analyzed theoretically using a semiclassical model, in the limit that the dielectric apertures are optically thin. Idealized cavities based on single interface and constant reflectivity mirrors are studied, though the model can be applied to more realistic cavities based on distributed Bragg reflectors or vertical cavity surface emitting lasers. The analysis shows that shortening the cavity length can lead to better confined modes with lower threshold, especially for very small aperture sizes.

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