A gas laser

摘要

A gas laser and a dedusting unit thereof are provided. The gas laser comprises a tube (101) containing a gas mixture including a laser gas and preferably a buffer gas. The tube preferably comprises a cylindrical inner wall (140). A discharge unit (102) is inserted into the tube and has two elongated electrodes (104,105) defining an electrical gas discharge gap therebetween for providing an electric gas discharge between said electrodes to generate laser light. A circulation means (201) is included in the tube for generating a gas flow within the tube that passes through the discharge gap. A dedusting unit (202) is mounted along the inner cylindrical wall of the tube in such a manner that only a bypass flow which is a part of the gas flow within the tube passes through the dedusting unit. <IMAGE>