Abstract: A laser nozzle, optical cavity walls, and combustion manifold system is formed having a plurality of laser nozzle members formed having two elongated projections on each side thereof, a forward projection and a rearward projection, and when said members are placed together, the rear projections meet to form a solid wall while said forward projections are spaced to form an elongated nozzle. Side plates enclose the ends of the nozzle members and end plates cover the ends of the side plates and exposed surface of the end nozzle members. The cavity formed between the two projections is fed a lasing gas through openings in the side plates from a manifold system. The laser nozzle members can be internally cooled along with associated combustion distribution manifolds.