Abstract: This invention relates to purification of a multicomponent gas while purifying and circulating a gas medium, such as a laser gas medium or the like. An object of the present invention is to provide a gas laser apparatus operating method and a gas laser apparatus in which it is easy to keep the laser output power constant for a long time. Disclosed is a method which performs laser oscillation while circulating a laser multicomponent gas medium containing a rare gas and in which the laser gas medium is circulated through an absorbent (10) which has been refrigerated to a temperature where all the components of the laser gas medium necessary for laser oscillation are not solidified.

Abstract: The invention relates to a gas laser using a laser gas medium while circulating and purifying the laser gas medium. An object of the invention is to provide a gas laser apparatus operating method and a gas laser apparatus in which it is easy to keep laser output power constant for a long time. Disclosed is a method for performing laser oscillation while circulating a laser gas medium containing a rare gas, in which a gas which is to be solidified at a trap temperature is preliminarily attached to a low temperature trap containing a filler so as to be solidified, and then the solidified gas is brought into contact with the laser gas medium.