Patent ID: 6160831
Filing Date: 2000-12-12
Classification: G01J

Abstract:
An excimer laser system, comprising:an excimer laser discharge chamber and resonator for generating an output beam at a particular wavelength;means for generating first reference light having a known wavelength;a dispersive element;a position sensitive detector;optics for directing a portion of the output beam of said excimer laser and said first reference light along a common optical path including said dispersive element and said detector;a sensor for monitoring the alignment of said excimer laser output beam and said first reference light; andan adjustable optic for controlling the alignment of said excimer laser output beam an said first reference light in response to the monitoring by the sensor,wherein the wavelength of the output beam of the excimer laser is determined based on the position at which a line from the excimer laser beam strikes the detector relative to the position at which a line from the first reference light strikes the detector.