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Abstract

A gas laser device includes a laser oscillator outputting laser light, and a laser amplifier amplifying the laser light and outputting the amplified laser light. The laser amplifier includes a discharge chamber accommodating electrodes for causing discharge, an input coupling optical system causing part of the laser light to be transmitted toward the discharge chamber, and an output coupling optical system configuring an optical resonator together with the input coupling optical system and causing part of the laser light transmitted through the input coupling optical system and the discharge chamber to be transmitted therethrough and output the amplified laser light. A first focal point of the input coupling optical system and a second focal point of the output coupling optical system in a first direction being perpendicular to a direction of the discharge coincides at a position between the input coupling optical system and the output coupling optical system.

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First Claim