is injected into the laser cavity between adjacent pairs of nozzles by means of the serrated primary nozzle surfaces in order to control the flow trajectory of the cavity fuel this nozzle configuration eliminates the gas flow normally required for base purge simplifies the design and fabrication of the nozzles and increases overall mass efficiency of the laser by utilizing all of the cavity area 28 to produce gain in this embodiment of the present invention the placement of nozzle blades at the base allows the laser to fully utilize a conventionally inactive zone that occupies approximately 40 percent of the length of gain region by injecting the fuel internal to the nozzle the expansion that the fuel will undergo in the cavity is limited referring to helium and hydrogen flow jet patterns 76 and 78 respectively complete use of the laser gain region 28 is illustrated in a further embodiment of the present invention the components described above are assembled into a boxer laser 100 as shown in fig9 at least one boxer laser module is contained in a housing comprised of upper and lower manifold assemblies 160 and 168 surrounded by enclosed gain regions 128 the at least one boxer laser module comprises the boxer laser 100 along with a surrounding optical train comprised of various optical elements e g mirrors reflectors beamsplitters lenses switches and the like 180 one skilled in the recognizes the necessity for optical elements and the many configurations of optical.