Patent ID: 9490602
Filing Date: 2016-11-08
CPC Classification: H01S

Claim Text:
1. A laser system comprising: a laser gas container forming a gas channel through which laser gas circulates, a laser oscillator oscillating laser light by using laser gas flowing through the gas channel as an excitation medium, a gas pressure detector detecting a laser gas pressure in the laser gas container, a pressure adjusting part adjusting the laser gas pressure in the laser gas container based on a value detected by the gas pressure detector, a pressure control unit controlling the pressure adjusting part so that when shutdown of the laser oscillator is instructed, the laser gas pressure in the laser gas container becomes a first gas pressure lower than atmospheric pressure and so that at a preparatory stage after startup of the laser oscillator and before radiation of the laser light to an outside, the laser gas pressure in the laser gas container becomes a second gas pressure capable of oscillating laser light, a laser control unit controlling the laser oscillator so that the laser oscillator executes an initial operation in which the laser oscillator outputs laser light in accordance with a predetermined oscillation condition at the preparatory stage, a laser detector detecting an output of the laser light in the initial operation of the laser oscillator or a physical quantity having a correlative relationship with the output of the laser light in the initial operation of the laser oscillator, and a hermetic seal estimating part estimating an extent of leakage in the hermetic seal of the laser gas container based on a detection value obtained by the laser detector.