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(a) scanning electron microscope image of a spiral-shaped microcavity disk laser diode with a disk radius of for . (b) The side view of the fabricated laser. (c) The measurement of the laser output with a fiber. The inset figure in (a) is the perimeter of the cavity.
Output power depending on the pumping current: the threshold is around . Here, the intensity is plotted in arbitrary.
Optical spectra of near field intensity, is the (a) spectrum for the two cases of the pumping current: the lower trace (A) is the power spectrum at and the upper trace (B) at . In the upper trace, we can see periodic sharp peaks. (b) The enlarged spectrum in order to see the mode spacing.
Far field pattern showing a directional emission.
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