Abstract
Ultraviolet ZnO rib waveguide random lasers with stripe width ranging from 1.7 to 6.5μm have been fabricated. It is found that the ZnO random lasers demonstrate strong TE lasing emission especially for rib waveguide with a narrower width. Rate equation analysis has shown that the dominant TE lasing emission is due to the corresponding large confinement factor and scattering strength inside the random media with rib waveguide. In addition, Fourier transform studies of the lasing spectra show that the width of rib waveguide constrains the formation of closed-loop paths of lights and, hence, reduces the number of lasing peaks.
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