X-Ray Laser Cavity Experiments

X -ray laser cavity experiments*N. M. Ceglio, D. P. Gaines, J. Trebes,A. M. Hawryluk, D. G. Stearns, G. L. HoweLawrence Livermore National Laboratory, University of CaliforniaP. O. Box 5508, L -473, Livermore, California 94550AbstractWe report progress toward the development of multipass, soft x -ray laser cavitiesoperating in a spectral range around 200 A. Experimental results on the characteri-zation of normal incidence multilayer mirrors, the survival of multilayer mirrors in thehostile x -ray laser environment, and the performance of double pass cavities at 206 A to209 A are presented.IntroductionThere are a number of strong motivations for x -ray laser cavity development: enhance-ment of laser output efficiency, correction of refractive effects associated with inhomo-geneities in the gain medium, and improvement of the spatial coherence of the output