Growth of the organic nonlinear optical material mnba‐Et (4′‐nitrobenzylidene‐3‐ethylcarbonylamino‐4‐methoxyaniline) crystals by the czochralski method

For the first time melt growth of the nonlinear optical organic material 4′‐nitrobenzylidene‐3‐ethylcarbonylamino‐4‐methoxyaniline (MNBA‐Et) by the Czochralski (CZ) method has been carried out to achieve single crystals with large diameter. [100] oriented boules having a diameter of 15 mm and maximum height of 15 mm have been prepared. The structural quality of the CZ crystals is comparable to those from solution growth. The 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.