The present invention relates to a VCSEL array comprising several VCSELs arranged side by side on a common substrate (1). Each VCSEL is formed of at least a top mirror (5, 14), an active region (4), a current injection layer (3) and an undoped bottom semiconductor mirror (2). The current injection layer (3) is arranged between the active region (4) and the bottom semiconductor mirror (2). At least an upper layer of the substrate (1) is electrically conducting. Trenches (8) and/or holes are formed between the bottom semiconductor mirrors (2) of said VCSELs to said upper layer of said substrate (1). A metallization (9) electrically connects the upper layer of the substrate (1) with the current injection layer (3) through said trenches (8) and/or holes. The proposed VCSEL array allows a homogeneous current injection an has a high efficiency and power density.