Nonlinear Optical Properties of N-(4-Nitrophenyl)azoles

Abstract

Nonlinear optical constants( d ) for 1-(4-nitropheny1)-pyrrole[NPRO], 2-ethyl-1-(4-nitrophenniytrl)oipmhdeanzole-[1ENIM, 2], , 4-triazol2e, 4-di[mDeMthNyT1-]1 -(4-annitdr oph3e, n 5y-dl)iicmhliodraoz-o1l-e([4D-nMitNroIp], h eny1)-1 3, , 5 2-, d i4m-teritahzyo1l-e1 [DCNT], which are similar to 3, 5-dimethyl-1-(4-nitrophtnyl)pyrazole [DMNP] in structure and have high transparency in blue light region, were calculated based on the oriented gas model. The results obtained were as follows: NPRO d ₃₃=275 pm/V; ENIM d₃₂=57 pm/V; DMNT d₃₂=67 prn/V; DMNT d₄₂=46 pm/V and DCNT ₂₁=71 pm/V. Since four compounds other than NPRO have fairly large offdiagonal d components, they are expected to be phase matchable in SHG and to be suitable materials for blue light SHG devices.