Patent ID: 8929414
Filing Date: 2015-01-06
Classification: H01S

Abstract:
1. A gas laser oscillator, comprising: a discharge tube through which laser gas circulates; an output command part outputting a power output command; a power supply part supplying a discharge tube voltage corresponding to the power output command to the discharge tube so as to start a discharge in the discharge tube; a voltage detecting part detecting the discharge tube voltage; a current detecting part detecting an output current of the power supply part; a command voltage control part gradually increasing a power output command value output from the output command part so as to start the discharge in the discharge tube; and a discharge start judgment part judging if the discharge in the discharge tube has started, based on a detected value of the voltage detecting part when gradually increasing the power output command value, wherein, if the output current detected by the current detecting part becomes a predetermined threshold value or more when gradually increasing the power output command value, the command voltage control part decreases the power output command value once, then again gradually increases the power output command value.