Crystal Growth,Morphology and Transmission Spectrum of the Organic Nonlinear Optical Crystal DAST

DAST crystals with the dimension up to 10 mm×10 mm×1-2 mm were prepared by spontaneous nucleation and seeded method.The effect of different growth positions on the morphology and growth habit of DAST crystal was investigated.The crystal growing from the middle and the top of the solution had a propensity to grow along a axis to form a sheet crystal;the crystal growing from the bottom of the solution would grow faster along c axis to form a nubby crystal.X-ray diffraction rocking curve of(001) face of DAST crystal was measured and the effect of different growth methods on the quality of DAST crystal was analyzed.In addition,the transmission spectrum and absorption coefficient of the obtained crystals were also investigated.