Semiorganic nonlinear optical material: Crystal growth, structure and optical properties of NaB(L-C_4H_4O_5)_2

摘要

Single crystal of the semiorganic NLO material NaB(L-C_4H_4O_5)_2 has been grown with sizes up to 8×5×2 mm~3 by the slow evaporation method. The crystal structure of this compound was determined by single crystal X-ray diffraction. It crystallizes in the Monoclinic space group P2 with lattice parameters a = 5.4045(11)A, b=11.692(2) A, c=9.4773(19) A and Z=2. Thermal analysis demonstrated NaB(L-C_4H_4O_5)_2 are thermally stable up to 280℃. NaB(L-C_4H_4O_5)_2 exhibits an absorption edge about 220 nm in the UV region. The powder second-harmonic generation (SHG) measurement performed on the ground crystal indicates that it has a NLO efficiency of about 2 times that of KDP (KH_2PO_4) standard. In addition, the origin of stronger SHG effect was discussed.