A method for converting agricultural biomass or industrial bio waste into biofuel using concentrated radiated energy is disclosed. Biomass or bio waste is stored inside a batch reactor in either solid or semisolid state. Unwanted moisture and unwanted oxygen are removed from the stored agricultural biomass or industrial bio waste. Concentrated radiated energy is directed towards the biomass or bio waste through a radiated energy concentrator that focuses the concentrated radiated energy. Biomass or bio waste is kept within the depth of focus of the concentrated radiated energy during the conversion operation. Due to substantial matching of the absorption peak of biomass or bio waste with the emission peak of the concentrated radiated energy, the biomass or bio waste that is within the depth of focus instantaneously decomposes into biofuel. The biofuel thus generated is at ambient temperature with higher energy density.