GROWTH OF THE ORGANIC NONLINEAR-OPTICAL MATERIAL MNEA-ET BENZYLIDENE-3-ETHYLCARBONYLAMINO-4-METHOXYANILINE) CRYSTALS BY THE CZOCHRALSKI METHOD

For the first time melt growth of the nonlinear optical organic materi al obenzylidene-3-ethylcarbonylamino-4-methoxyaniline (MNBA-Et) by the Czochralski (CZ) method has been carried out to achieve single crysta ls with large diameter. [100] oriented boules having a diameter of 15 mm and maximum height of 15 mm have been prepared. The structural qual ity of the CZ crystals is comparable to those from solution growth. Th e colour of the melt and the grown crystal changes from transparent to opaque as a result of using the same melt for multiple growing cycles deteriorating considerably the optical transmittance.