Fidelity of phase-conjugated beams in a four-wave mixing set-up using Bi12TiO20-crystals Kiessling, A. ; Baade, T. ; Wenke, L. Abstract Publication: Journal of Modern Optics Pub Date: July 1996 DOI: 10.1080/09500349608232823 Bibcode: 1996JMOp...43.1525K