Circularly Symmetric Operation of a Concentric-Circle-Grating, Surface-Emitting,AlGaAs/GaAs Quantum-Well Semiconductor Laser

摘要

A surface-emitting semiconductor laser that utilizes a concentric-circle gratingdefined by electron-beam lithography is observed to oscillate in a circularly symmetric fashion. The laser emits a circularly symmetric beam with a total beam divergence of less than 1 degree. Despite its broad-area geometry, the laser shows no evidence of filamentation. The laser maintains a relatively narrow wavelength spectrum approximately 1 angstrom in width. Surface-emitting laser; Semiconductor laser; Circular, surface-emitting laser.