Aromatic organic crystals have been of particular interest because some of them have exhibited efficiencies of at least 1 order of magnitude above those of classical inorganic materials such as KDP or LiNbO3. The strong cleavage in aromatic organic materials results from larger conjugated molecular planes. Their low melting point is due to weak bonding between molecules. They are not transparent for wavelengths of <450 nm because of the red shifting of the longest absorption band. They also have a very large birefringence. For these reasons, the applications of aromatic organic materials are restricted.
© 1990 Optical Society of AmericaPDF Article