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由于脉冲激光源在烧蚀激发声脉冲时，其时域特性非常接近于理想的δ（ｔ）函数，因此激光超声技术不仅可用于复杂的各向异性媒质声的激发和传播理论作实验验证，而且由于它的非接触激发和接收特性，也已成为各向异性材料特性检测的有效手段。单晶硅是晶格常数为５．４３Ａ的立
Because the pulsed laser source ablates the excitation sound pulse, its time-domain characteristics are very close to the ideal δ (t) function. Therefore, the laser ultrasonic technique can not only be used to verify the theory of excitation and propagation of complex anisotropic media, And because of its non-contact excitation and reception characteristics, has also become an effective means of anisotropic material properties detection. Monocrystalline silicon is a lattice constant of 5.43A legislation