  Spatially and spectrally resolved microscopic images of spontaneous and
stimulated emissions are imaged at the mirror facets of a GaAs T-shaped quantum
wire laser with high uniformity. Laser emission from the one-dimensional ground
state reveals a circular image located at the core of a T-shaped optical
waveguide but significantly smaller in area than the low power spontaneous
emission from the same waveguide. These images unambiguously allow assignment
of all spontaneous and laser emissions to the wire ground state and respective
intersecting wells in the structure.
