Abstract: A coupler for conveniently coupling an articulated arm to a laser housing whereby the laser beam need not be realigned down the articulated arm each time the arm is coupled to the laser housing. The coupler includes a kinematic plate attached to the laser housing, a sleeve rotationally attached to the plate forming a center bore, and a connector attached to an articulated arm. The connector has a cylindrical shaped projecting member that inserts into the bore of the sleeve. Races are formed on the outer surface of the cylindrical member. The sleeve has roller bearings protruding inside the bore to engage the races. Ball bearings are attached to the end of the cylindrical member to engage the kinematic plate. The races are shaped such that when the sleeve is rotated, the cylindrical member is forced toward the kinematic plate until the ball bearings are secured against the kinematic plate.

Abstract: A fast axial flow carbon dioxide laser has a laser head arranged to provide multiple folding of the laser beam into two, four or more linear passes. The construction of the head is such as to provide for generating either one laser beam or a pair of beams, by adjustment of optics. Located centrally in the laser head is a single exhaust manifold for exhausting all of the axially flowing gas from a series of colinear and spaced parallel discharge tubes on opposite sides of the exhaust manifold. Gas flow is from two outer inlet manifolds toward the central exhaust manifold, so that optics of the system are isolated from contamination and from the hot exhaust. Adequate distribution of gas within each discharge tube is assured by the manner in which the flowing gas is directed into the discharge tubes.