Morphology of a novel semiorganic nonlinear optical crystal, L-arginine trifluoroacetate ( + (NH 2 CNH(CH 2 ) 3 CH(NH 3 + )COO -· CF 3 COO -) has been indexed. The crystal has nine developed facets with major ones (1 j 01) (1 j 00) and (001). The dielectric constant and dielectric loss were recorded both as function of frequency and temperature in detail. The measured specific heat values of LATF are larger than those of LAP and KDP. The thermal expansion is highly anisotropic along different directions. The refractive indices and optical damage threshold have also been investigated for the first time.

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Highly-deuterated potassium dihydrogen phosphate (DKDP) crystals were grown rapidly from point seeds under high supersaturation in a temperature range of 40-60 o C. The growth rate was about 1-2 order of magnitude higher than that of the traditional temperature reduction method. It was found that highly pure raw materials, overheating at high temperature, ultrafine filtration and supersaturation stability were needed to keep the solution from spontaneous nucleation at high overcooling. The effect of growth conditions on pyramid faces was different from that of prismatic faces. The tetragonal to monoclinic phase solubility transition scarcely occurred in our experiments even though the overcooling of monoclinic phase was as high as 10 o C in some cases.