Patent ID: 7567607
Filing Date: 2009-07-28
Classification: G01J,G03F,H01S

Abstract:
1. An apparatus comprising: a multi-chamber gas discharge laser system comprising: a first laser unit comprising: a first discharge region containing: an excimer or molecular fluorine lasing gas medium; a first pair of electrodes defining the first discharge region containing the lasing gas medium, a line narrowing unit for narrowing a spectral bandwidth of output laser light pulse beam pulses produced in said first discharge region, comprising a grating; a second laser unit comprising: a second discharge chamber containing: an excimer or molecular fluorine lasing gas medium; a second pair of electrodes defining the second discharge region containing the lasing gas medium; a pulse power system providing electrical pulses to the first pair of electrodes and to the second pair of electrodes producing gas discharges in the lasing gas medium between the respective first and second pair of electrodes, and a laser parameter control mechanism modifying a selected parameter of a selected laser output light pulse beam pulse produced by said gas discharge laser system by modifying the wavefront of the laser light pulse beam, comprising: a deformable wavelength selection optical element comprising an element of the line narrowing unit other than the grating.