Optically pumped ultraviolet microdisk laser on a silicon substrate

The fabrication of optically pumped ultraviolet microdisk lasers on silicon substrates was discussed. It is observed that a thin layer of ZnO was deposited on top of the silica microdisks using metalorganic chemical vapor deposition and served as the gain medium. The hybrid silica microdisk was optically pumped by the third harmonics of a mode-locked Nd:YAG laser. It was also observed that the red shift in the emission spectra was caused by the increase of ZnO refractive index with carrier density. Results show that emission intensity of pumping is increased by decreasing the spectral width of the lasing modes, above the lasing threshold.