Patent ID: 7995637

Claim:
A gas discharge laser chamber comprising: a discharge region formed between a first electrode and a second electrode; a tangential fan for circulating gas through the discharge region, wherein the fan is proximate to an input side of the discharge region; an input side acoustic baffle proximate to the input side of the discharge region including: a vanishing point leading edge; a vanishing point trailing edge; a gas flow smoothing offset surface aligning a gas flow from a surface of the input side acoustic baffle to an input side of a cathode support in the discharge region; a plurality of ridges separated by a plurality of trenches, wherein the plurality of ridges and the plurality of trenches are aligned with a direction of gas flow through the discharge region, wherein the plurality of trenches include a corresponding plurality of trench faces extending from each one of the plurality of trenches to the adjacent one of the plurality of ridges and wherein each one of the plurality of trench faces forms an angle with a line normal to the acoustic baffle and centered on the corresponding one of the trenches, wherein the angle has a random measure of between about 20 and about 60 degrees.