Blower for gas laser

A tangential blower for use in a gas discharge laser is provided provides improved homogeneity of laser gas flow through the discharge region of the laser. A flange which supports adjacent blower sections has an aerodynamic shape and occupies a minimal portion of the space in the inlet region of the blowers. The ends of the blower's shafts may be formed as a twice-profiled polygon which is has a non-uniform and preferably rounded geometry along its longitudinal axis where it fits into end flanges. The blades of the blower may be formed with varying thickness and radii of curvature. The blower's blades and hubs may be cast as a single piece of steel, titanium alloy, or other suitable material.