Patent ID: 9225139
Filing Date: 2015-12-29
Classification: F16C,H01S

Abstract:
1. A discharge-pumped gas laser device, comprising: a laser chamber being independently replaceable; a pair of discharge electrodes provided in the laser chamber; a fan with a magnetic bearing being provided in the laser chamber and configured to be capable of circulating a gas in the laser chamber; a housing configured to contain the laser chamber; a magnetic bearing controller connected to the magnetic bearing electrically, being capable of controlling the magnetic bearing, separated from the laser chamber, provided in the housing, and including a digital circuit and a storage element or external terminal connected the digital circuit; and a laser controller configured to control generation of laser light, wherein the digital circuit calculates an optimal value in order to provide a rotor included the fan with a target control value, and the laser controller causes the magnetic bearing controller to execute calculation and setting of a control parameter necessary for a control of the magnetic bearing in a case where at least one of a predetermined time course, a predetermined number of an output(s) of the laser light, a predetermined change of a predetermined gas pressure in the laser chamber, vibration of the laser chamber, a predetermined change of a wavelength stability of the laser light, a predetermined change of an energy stability of the laser light, touchdown of the magnetic bearing, and an error in the magnetic bearing controller, is detected after replacement of the laser chamber.