Discovery of the low temperature phase barium metaborate (BBO) and its significance in the search for new type nonlinear optical materials

摘要

THE first laser excitation in 1960 with ruby (α-Al_2O_3:Cr) as a laser crystal and the first doubling of frequency (347.15 nm) in 1961 by irradiating quartz crystal (α-SiO_2) with a 694.3 nm laser beam have laid the basis for the study of laser andnonlinear optical (NLO) crystals, thus opening up a new field for nonlinear optics and materials science.