A Simple Relationship between Directivity and Linewidth of a Planar Microcavity Laser

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Abstract
On the basis of the analysis of the cavity quasimode structure, the relationship between the directivity and the linewidth of the output beam from a laser with a planar microcavity is examined assuming a narrow spectral width of the laser medium. A simple relation is obtained which implies that, in a planar laser, the directivity is determined by the net loss of the laser similarly to the laser linewidth.