ROMOPTO 2000 : Sixth Conference on Optics : 4-7 September, 2000, Bucharest, Romania / Valentin I. Vlad, chair/editor ; sponsored by, National Agency for Science, Technology nad Innovation (Romania) [and others] ; organized by, Division of Optics and Quantum Electronics (Romania) [and others] ; published by, SPIE--the International Society for Optical Engineering