Laser chamber with metal damper member

A laser chamber of a discharge excitation type gas laser apparatus, comprising:

• a first discharge electrode disposed in the laser chamber;
• a second discharge electrode disposed as facing the first discharge electrode in the laser chamber;
• a fan configured to make a laser gas flow in a flow direction through a discharge space between the first and second discharge electrodes;
• a first insulating member disposed in positions upstream and downstream from the first discharge electrode in the flow direction;
• a first metal damper member disposed in a position upstream from the second discharge electrode in the flow direction;
• a second insulating member disposed in a position downstream from the second discharge electrode in the flow direction, the second insulating member being directly adjacent to a side surface on a downstream side of the second discharge electrode in the flow direction;
• and
• a second metal damper member disposed in a position downstream from the second insulating member in the flow direction, wherein,
• the second metal damper member includes a first surface facing the flow path of the laser gas between the second metal damper member and the first insulating member, a first side surface being on an upstream side of the second metal damper member in the flow direction, and a first corner formed by the first surface and the first side surface,
• the second insulating member includes a second surface facing the flow path of the laser gas between the second insulating member and the first insulating member, a second side surface being on a downstream side of the second insulating member in the flow direction, and a second corner formed by the second surface and the second side surface, and
• the first corner is in contact with the second side surface such that the first corner divides the second side surface into a first portion exposed to the flow path and a second portion separated from the flow path.