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(Color online) Refractive and absorption indices vs photon energy for light polarization perpendicular to the wurtzite-structure axis of the ZnO layer. The inset shows a waveguide simulation based on measured thicknesses and refractive indices of the involved layers.
(Color online) Emission wavelengths as a function of device temperature for the DFB emission (circles) and the luminescence (squares). The lines are guides to the eye.
(Color online) (a) Schematic representation of the optical pump experiment and relevant diffraction orders of both and ZnO DFB lasers. (b) Scanning electron microscopy image of the diffraction grating.
(Color online) Emission spectra as a function of optical pump power measured at 0.15, 0.25, 0.35, 0.45, 0.6, 0.8, 0.9, 1.0, and (from lowest to highest curve). The inset shows peak power (triangles, left axis), emission wavelength (squares, right axis), and linewidth (circles, left axis, times ten) vs pump intensity curves.
(Color online) Luminescence (top) and luminescence/DFB laser spectra (bottom) for three representative temperatures (120, 220, and , from left to right). The wavelength mismatch between the luminescence peaks at is due to the higher pump intensity and the concomitant wavelength shift required for DFB lasing.
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