Abstract: A microwave excited gas laser apparatus includes a single unit having at least first, second, third, and fourth waveguides. The first and second waveguides meet at a first intersection. The third and fourth waveguides meet at a second intersection. A discharge tube contains a laser medium gas, and extends through the first and second intersections. Microwaves are radiated into the first, second, third, and fourth waveguides. The discharge tube in the first intersection is exposed to a microwave propagated along the first waveguide and a microwave propagated along the second waveguide. The discharge tube in the second intersection is exposed to a microwave propagated along the third waveguide and a microwave propagated along the fourth waveguide.

Abstract: A laser apparatus includes an output mirror and a total reflection mirror. A discharge tube is located between the output mirror and the total reflection mirror. The discharge tube contains laser medium gas. A first block connected to a first end of the discharge tube supports the first end of the discharge tube and also the output mirror. A second block connected to a second end of the discharge tube supports the second end of the discharge tube and also the total reflection mirror. A third block connected to an intermediate portion of the discharge tube supports the intermediate portion of the discharge tube. An optical bench supports the first block, the second block, and the third block. A turboblower connected to the third block is supported by the third block. A first passage connects the turboblower and the first block. A second passage connects the turboblower and the second block.

Abstract: Carbon dioxide gas is fed in a metallic laser tube extending along an optical axis through a plurality of gas feeding tubes placed outside the optical axis and is taken out from the metallic laser tube by a blower to circulate the carbon dioxide gas, and the carbon dioxide gas held in the metallic laser tube is cooled by a gas cooling element. A pair of microwaves in which electric fields oscillated in different directions are induced are injected from a pair of gas injecting points of the gas feeding tubes close to the ends of the metallic laser tube and are combined in the metallic laser tube.