Lasing on higher-azimuthal-order modes in vertical cavity surface emitting lasers at room temperature
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We report a direct method to observe higher-azimuthal-order whispering-gallery-like modes in vertical cavity surface emitting lasers (VCSELs) at room temperature. Instead of introducing any defect mode, we show that suppression of lower-order cavity modes can be achieved by destroying vertical reflectors with a surface micro-structure. Perfect higher-order modes with an azimuthal number as large as 41 are observed in experiments through collecting near-field radiation patterns, as well as in numerical simulations.
PACS42.55.Px 42.55.Sa 05.45.Mt
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