Different relationships between principal - axes and crystallographic - physical - axes result in different expressions of the effective nonlinear optical coefficient.
由于晶体的折射率主轴与其晶体物理主轴有著不同的配对方式,其三阶有效非线性系数计算公式将发生变化.
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A simple method for principal axes and principal moment of inertia of are is presented.