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对利用激光精细加工技术在铌酸锂(LiNbO3)晶体中写入光波导时的最佳曝光间距进行了详细地理论分析和实验研究.通过数值求解简化后的光折变动力学方程组,对会聚激光束沿不同方向扫描晶体时的最佳曝光间距进行了详细的数值模拟.结果表明:最佳曝光间距的选取与写入光束的扫描方向无关;当聚焦激光束平行于光轴扫描晶体时,得不到波导结构,但可以采用“三明治”辐照方式得到对称的折射率分布.采用会聚的绿激光束扫描掺铁铌酸锂(LiNbO3:Fe)晶体进行了实验研究,晶体中的光致折射率变
关键词:
激光精细加工
最佳曝光间距
光波导
3晶体')" href="#">LiNbO3晶体 相似文献
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Based on the diffraction theory model for hot-image formation, the
evolution of hot-images induced by multi-scatterers located in
the same plane perpendicular to the propagation axis is numerically
simulated. The simulation results show that hot-images induced
by coplanar multi-scatterers are also coplanar no matter whether
they exist simultaneously or severally. However, if they exist
simultaneously the peak intensity of the primary hot-images is
weaker than if they exist severally. The unequal competition
for energy between the scattered beams from the scatterers leads to
the fact that part of the corresponding hot-images are relatively
enhanced and the others are restrained. The results show that the
hot-images of certain scatterers become stronger when any of these
parameters, i.e. amplitude modulation coefficient, phase modulation
coefficient and size of the surrounding scatterer, decrease. 相似文献
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以“热像”形成的衍射理论模型和分步傅里叶算法为基础,模拟研究了厚介质情况下“热像”的形成特点.重点分析了散射点调制系数(包括振幅调制和相位调制)、散射点与介质前表面之间的距离、散射点大小、入射光强等参数的变化对“热像”点位置以及强度的影响.数值模拟结果与解析理论结果进行了对比,在散射点调制系数和入射光强的变化对“热像”的影响两种情况下,得出了与解析理论基本一致的结论;在散射点大小的变化对“热像”的影响情况下,得出了与解析理论预言不同的结论.此外,还发现散射点与介质前表面距离为零时,在介质后表面也可能出现“热像”效应.
关键词:
热像
小尺度自聚焦
分步傅里叶算法
散射点 相似文献
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