一种激光倍频新材料间羟基苯甲酸的初步研究

二阶非线性光学(NLO)材料又称为倍频材料,在光电子学领域中具有广泛的应用,是近年来研究热点之一[1～4].与无机材料相比,由于有机倍频材料具有非线性光学系数大、响应时间短和抗光伤阈值高等优异性能而倍受人们的关注.但有机材料在透光性能、热稳定性和材料的可加工性方面不及无机材料,使之应用受到很大限制.因而有效地解决这一问题是其得以广泛应用的关键.对于有机倍频材料来说,优化材料综合性能的关键在于保持有机材料优良性能的基础上提高化合物的透光性和热稳定性.有机化合物的分子间氢键和两性离子对改善NLO材料的热稳定性和牢固性…

Primary Study on a New Kind of Second-Order Nonlinear Optical Materialm-Hydroxybenzoic Acid

Anew kind of second order nonlinear optical(NLO) material--m-hydroxybenzoic acid(HBA) was reported in this paper. Primary study results revealed that it had a relatively strong nonlinearity, its powder SHG effect was 12 times that of KDP. The solid cut-off wavelength K_cut-off (350 nm) is very short compared to other organic second order NLOmaterials. The experimental results also showed that HBAhad a high laser damage threshold and good characteristic thermal stability. Furthermore, We calculated its second-order nonlinear hyperpolarizability β and analyzed the microscopic nonlinear properties, and found that the hydroxyl group could improve β obviously while the hydroxyl multisubstitution could hardly contribute to β values.