1. Department of Physics, Lund Institute of Technology, P.O. Box 118, SE-221 00, Lund, Sweden (M.B., M.S., R.G., B.A., S.K., S.S.); Department of Fiber and Polymer Technology, The Royal Institute of Technology, SE-100 44 Stockholm, Sweden (S.W., S.K.); Laser & Fiber Optics Centre, Department of Physics, University of Cape Coast, Cape Coast, Ghana (B.A.); and Weapons and Protection Division, FOI-Swedish Defense Research Agency, SE-147 25 Tumba, Sweden (A.L.)