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We present the fabrication of mirror facets by chemically assisted ion beam etching. Optical pumping experiments are performed to characterize the facets. The reflection coefficient is measured and its value confirms the high quality of the etched mirrors. Optical resonators are then realized in a double heterostructure composed of InGaN and GaN. Stimulated and laser emissions are investigated in this heterostructure and we show that population inversion can occur in both materials. (C) 1997 Elsevier Science S.A.