熔石英和磷酸盐钕玻璃表面三角形微裂纹对入射光的散射分析
Analysis of incident light scattered by triangle crack on fused silica and Nd-doped phosphate glass surfaces
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摘要: 采用时域有限差分方法(FDTD)模拟了石英玻璃和掺钕磷酸盐激光玻璃表面三角形微裂纹对入射光调制后的分布。TE模式光波入射，最大调制电场幅值出现在玻璃体内部;TM模式光波入射,最大调制电场幅值则发生在裂纹的缝隙中。两种入射光模式下，后表面的调制电场幅值增大倍数在相同裂纹条件下均比前表面大。TE模式入射时，当入射光在裂纹和玻璃表面相继发生全反射时，得到的调制电场幅值最大；后表面最大调制电场幅值随着裂纹在界面投影长度的增加、开口宽度的变大及裂纹深度的增加而分别增大。Abstract: Finite difference time domain (FDTD) method is used to simulate the incident light scattered by planar cracks with triangular cross-section on fused silica and Nd-doped phosphate glass surfaces. When the incident light is TE mode, the maximum electric field is in the glass. When the incident light is TM mode, the maximum electric field locates inside the crack. The maximum electric field enhancement located at output surface is much higher than that at input surface for both modes. Cracks under TE illumination lead to the maximum electric field when the incident light is totally internally reflected by the crack and by the surface successively. The maximum electric field on rear surface increases with either larger crack width or deeper crack depth.
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