Abstract: ide materials are potential candidates for frequency conversion applications. In addition to being chiral, which ensures crystallization in a space-group relevant for three-wave mixing processes, they generally possess useful physical and optical properties. We have examined the powder second harmonic generation efficiencies of both saturated saccharides and sugars with simple polar $pi@-functionalities. Powder efficiencies of up to 5 times that of sucrose were observed for simple saturated sugars, whereas values of 18 times sucrose (or 0.45 $MUL urea) were observed for unsaturated saccharide derivatives. We have noted that for both classes of material, there is a tendency for more efficient nonlinear compounds to reside in a monoclinic rather than an orthorhombic space-group. We have also noted that there appears to be a correlation between the phase-matching potential and the crystal symmetry. !16
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机译：摘要：ide材料是变频应用的潜在候选者。除了是手性的（可确保在与三波混合过程相关的空间群中结晶）外，它们通常还具有有用的物理和光学特性。我们已经研究了饱和糖和具有简单极性$ pi @功能的糖的粉末二次谐波产生效率。对于简单的饱和糖，粉末效率高达蔗糖的5倍，而对于不饱和糖衍生物，粉末效率高达18倍的蔗糖（或0.45 $ MUL尿素）。我们已经注意到，对于这两种材料，都有一种趋势是更有效的非线性化合物驻留在单斜的空间群中，而不是正交的空间群中。我们还注意到，相位匹配电位和晶体对称性之间似乎存在相关性。 ！16
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