Patent ID: 7664155
Filing Date: 2010-02-16
Classification: H01S

Abstract:
1. A gas laser oscillating unit comprising: first and second gas flow passages through which a gas medium for laser oscillation flows; a gas junction part where the first and second gas flow passages join together; and first and second excitation parts, arranged in the first and second gas flow passages, respectively, the first and second excitation parts being positioned along the same laser axis and configured to excite the medium gas; wherein the structure of the first gas flow passage from the first excitation part to the gas junction part and the structure of the second gas flow passage from the second excitation part to the as unction part are not plane-symmetric in relation to a plane including the center point of the gas junction part and extending perpendicular to the laser axis, and are 180-degree rotationally-symmetric about a center axis extending through the center point of the gas junction part and perpendicular to the laser axis, and wherein the first gas flow passage is configured to divert the gas medium entering into the gas junction part away from the laser axis in a first direction and the second gas flow passage is configured to divert the gas medium entering into the gas junction part away from the laser axis in a second direction, wherein the first direction is different from the second direction.