Abstract: Na_5[B_2P_3O_(13)](NBP)and BaAlBO_3F_2(BABF)nonlinear optical crystals have been synthesized by hydrothermal method, the moderate reaction conditions have also been determined. The feasible initial charging ratio has been investigated in order to fabricate pure BABF. The as-synthesized NBP and BABF are characterized by XRD, SEM and second harmornic generation effect measurement, respectively.

Key words: Na_5[B_2P_3O_(13)](NBP)and BaAlBO_3F_2(BABF)nonlinear optical crystals have been synthesized by hydrothermal method, the moderate reaction conditions have also been determined. The feasible initial charging ratio has been investigated in order to fabricate pure BABF. The as-synthesized NBP and BABF are characterized by XRD, SEM and second harmornic generation effect measurement, respectively.