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一、引言随着非线性光学应用技术的发展,对非线性光学材料提出越来越高的要求。近年来,在非线性光学新材料探索研究中,似乎大家的注意力比较集中在有机材料方面。其主要原因是,在无机材料领域内,能产生大的倍频效应的基团,例如(MA_6)、(MA_4)、(MA_3)等已经找得差不多了,剩下的(MA_5)平方锥基团,虽然对产生大的倍频效应很有利,但是能形成方锥结构的只有(SbF_5)~(-2) 、(TeF_5)~(-1)等几类毒性很大的材料。因此,近年来虽作过一些努力,
I. INTRODUCTION With the development of non-linear optical application technology, higher and higher requirements are placed on nonlinear optical materials. In recent years, in the study of nonlinear optical materials exploration, it seems that everyone’s attention is more focused on organic materials. The main reason is that in the field of inorganic materials, groups that generate large frequency doubling effects such as (MA_6), (MA_4), (MA_3) and the like have almost been found. The remaining (MA_5) Although it is very beneficial to produce a large frequency doubling effect, the only one that can form a square cone structure is the very toxic materials such as (SbF_5) -2 and TeF_5 -1. Therefore, although some efforts have been made in recent years,