Near-field scanning optical micrograph of a Vertical Cavity Surface Emitting Laser (VCSEL). The color indicates the intensity of the lasing super-imposed upon the surface topography. The modal structure is indicative of the co-existence of spatially isolated modes, while overlapping transverse modes compete for available gain.
Courtesy of G. Vander-Rhodes, K. Knopp, M. S. Ünlü, and B. B. Goldberg, Boston University.
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