| 四波混频实时光学检测 |
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| 引用本文： | 尚庆虎. 四波混频实时光学检测[J]. 光学技术, 2005, 31(3): 437-440 |
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| 作者姓名： | 尚庆虎 |
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| 作者单位： | 中国电子信息产业发展研究院,北京,100081 |
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| 摘 要： | 分析了利用掺铁铌酸锂晶体作介质的简并四波混频及其在干涉计量术中应用的原理,描述了被测透明样品的表面各光波及其干涉形成的透射条纹及反射条纹,利用光折变晶体的介电驰豫特性,求得透射条纹和反射条纹的对比度随时间变化的公式及各参数的相互关系。对由透射条纹及反射条纹计算被测透明物体样品折射率和厚度不均匀性的方法作了数学分析,提出一种新型四波混频实时测量透明物体的光学不均匀性的方法和实验光路,对相关参数对测量过程及测量结果的影响作了探讨,得到了平板玻璃样品的干涉条纹图像,计算出实验结果。
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| 关 键 词： | 干涉测量 相位共轭 光折变 四波混频 晶体 |
| 文章编号： | 1002-1582(2005)03-0437-04 |
| 修稿时间： | 2004-09-07 |
Real-time testing through four-wave mixing with photorefractive materials |
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| SHANG Qing-hu. Real-time testing through four-wave mixing with photorefractive materials[J]. Optical Technique, 2005, 31(3): 437-440 |
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| Authors: | SHANG Qing-hu |
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| Abstract: | A degenerate four_wave mixing interferometry with the photo_refractive crystal LiNbO_3∶Fe was discussed. The interferograms included of the transmission and reflection fringes formed on the surface of the transparent plate objects tested with the interferometry were described. The contrast of the fringes changes as time going on,because of the dielectric characteristic of photorefractive crystals. Mathematic formulas to calculate the phase variations from the numbers and locations of those fringes are introduced. The experimental principle and device for real_time testing of the variations of the phases of optical transparent plate objects were presented. The experimental characteristics of the crystal were analyzed. Some quantitative results of the non_uniformities of refractive indices and thickness of a glass plate sample were given. |
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| Keywords: | non_destructive testing photorefractive crystal phase conjugation interferometry four_wave mixing |
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