Patent ID: 8379687
Filing Date: 2013-02-19
Classification: H01S

Abstract:
1. A line narrowed gas discharge laser system comprising a dispersive center wavelength selective element; a beam expander comprising a plurality of refractive elements; a refractive element positioning mechanism positioning at least one of the refractive elements to modify an angle of incidence of a laser light beam on the dispersive center wavelength selection element; each of the dispersive center wavelength selection element and the beam expander being aligned with each other and with a housing containing at least the dispersive center wavelength selection element; a housing positioning mechanism positioning the housing with respect to an optical axis of the gas discharge laser system, whereby the housing positioning element comprises a position locking mechanism and the housing comprising a front plate tilted by the housing positioning mechanism about a pivot point comprising a point of contact between a mounting mechanism and a portion of the front plate.