The purely chemical combustion-driven HBr chemical laser has been studied using D_2 as fuel and NF_3 as oxidant.The pumping reaction is H+Br_2→HBr(v≤6,J)+Br.Hydrogen and fluorine atoms are produced by the reaction of F+H_2 → HF+ H and burning D_2/NF_3 mixtures,respectively.And a supersonic flow system provides conditions of low temperature,low pressure and fast flowing to satisfy the need of laser extraction.The stable laser output at P_2(4)、P_2(5)、P_3(5)and P_3(6)with the maximum output power of 14.3 Wis o...