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We experimentally demonstrate the difference between a ridge polariton laser,and a conventional edge-emitting ridge laser operating under electron-holepopulation inversion. The horizontal laser cavities are 20 -- 60 $\mu$m longGaN etched ridge structures with vertical Bragg reflectors. We investigate thelaser threshold under optical pumping and assess quantitatively the effect of avarying optically-pumped length. The laser effect is achieved for an excitonreservoir length of just 15% of the cavity length, which would not be possiblein a conventional ridge laser, with an inversion-less polaritonic gain about 10times larger than in equivalent GaN lasers. The modelling of the cavity freespectral range demonstrates the polaritonic nature of the modes.

Ridge polariton laser: different from a semiconductor edge-emitting laser