| 摘要 |
A gas laser apparatus includes a chamber in which laser medium gas is sealingly filled; a pair of main discharge electrodes arranged opposite to each other in the chamber; and a fan disposed in the chamber; wherein the chamber has an inner wall of a substantially elliptic shape in a plane perpendicular to a lengthwise direction of the chamber, and a part of the inner wall being between the fan and the main discharge electrodes serves as a guide for guiding the gas made to flow by the fan toward the main discharge electrodes.
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