He Youping

Growth of large size urea crystals

Abstract High optical quality urea crystals can be grown from the solution by cooling by adopting 175 mm long seed and a limitation of the growth along the Z direction. Large crystals up to a size of 46×50×171 mm have been grown stably by this technology.

Growth of N-(4-nitrophenyl)-(L)-prolinol (NPP) crystal in organic solvents and its characterization

Abstract NPP crystals were grown using solution growth techniques and the grown crystals were characterized. The mechanism of growth was also discussed.

Growth and characteristics of 5-nitrouracil crystal

Abstract High optical quality 5-nitrouracil crystals can be grown by cooling an aqueous solution to below ≈60°C, in which a 37 mm long seed is immersed and growth is limited only along the Z direction. The largest crystal grown was 17×6×37 mm 3 .

New organic nonlinear optical crystals of indole-3-aldehyde

Abstract Indole-3-aldehyde (IA) with powder second harmonic generation (SHG) efficiency 38 times as large as that of KDP and cutoff wavelength of 340 nm is reported. The method of solvent evaporation was used to grow IA crystal. High quality single crystals with dimension of 18x8x35 mm 3 were obtained. IA crystal belongs to the orthorhombic system space group Pca2 1 , and the unit cell parameters are: a = 14.154(3) A, b = 5.836(2) A, and c = 8.724(4) A.

Growth and characterization of a new organic nonlinear optical crystal: 1-(3-thienyl)-3-(4-chlorophenyl)-propene-1-one

Abstract A new organic nonlinear optical crystal 1-(3-thienyl)-3-(4-chlorophenyl)-propene-1-one (CTC) with powder second harmonic generation (SHG) efficiency 3 times as large as that of KTP and cutoff wavelength of 410 nm is reported. Large single crystals (6×11×20 mm 3 ) were grown from acetone by slow cooling. The crystal structure of CTC is determined.

Growth of beryllium sulfate tetrahydrate (BST) crystal in hydrate solution

Abstract The method of solvent evaporation was used to grow BST crystals, and the habits of growth were observed and discussed. The second-harmonic generation (SHG) effects were determined.