Patent ID: 6750972
Filing Date: 2004-06-15
Classification: G01J,G03F,H01S

Abstract:
An ultraviolet laser wavemeter with enhanced illumination comprising:A. a beam splitter for extracting a portion of a laser beam from an ultraviolet laser said portion comprising two spatially separated beams each reflecting from a separate surface of said beam splitter; B. a defractive diffuser; C. reducing optics for reducing size of said two spatially separated beams and directing the two reduced beams so as to illuminate said defractive diffuser to produce a merged diffuse beam at an exit surface of said defractive diffuser; D. a second diffuser; E. imaging optics for imaging a portion of said merged diffuse beam on to a second diffuser to produce a first twice diffused merged beam at an exit surface of said second diffuser; F. an etalon positioned to be illuminated by said first twice diffused merged beam so as to produce interference fringes; G. a fringe detector and focusing optics for focusing output beams from said etalon onto said fringe detector; and H. a processor programmed with an algorithm for calculating spectral characteristics of said laser beam based on fringe information produced by said fringe detector.