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采用德国Trioptics公司生产的新一代全自动高精度折射率测量仪,测量了磷酸二氢钾(KDP)晶体不同部位的样品位于近紫外到近红外波段(0.253—1.530μm)内12个不同波长处的折射率,测量精度达到10-6量级.结果表明,大尺寸KDP晶体不同部位样品的折射率存在不均一性,靠近晶体恢复区的样品折射率小于晶体锥头区的样品折射率,偏差在10-5—10-4量级.研究发现,这种折射率不均一性与晶体不同部位的结晶质量存在差异有关.另外,将测量数据与其他文献中的数据进行对比.结果显示,所测试的样品数、波段宽度、测量点数量以及数据的精度均超过其他文献,结合测试条件分析了不同文献数据存在差异的原因.最后,使用最小二乘法拟合得到了KDP晶体较为可靠的Sellmeier方程.
A new generation of fully automatic high-precision refractive index measuring instrument manufactured by Trioptics Company in Germany was used to measure the samples of different parts of potassium dihydrogen phosphate (KDP) crystal at 12 different wavelengths in the near ultraviolet to near infrared (0.253-1.530μm) , And the measurement accuracy reaches 10-6 order of magnitude.The results show that there are inhomogeneities in the refractive index of samples in different parts of large size KDP crystal, the refractive index of the sample near the crystal recovery zone is smaller than the refractive index of the crystal cone head sample, In the order of 10-5-10-4.The study found that this refractive index inhomogeneity and crystal different parts of the crystalline quality differences exist.In addition, the measured data and other literature data are compared.The results show that the The number of samples tested, the width of the band, the number of measuring points and the accuracy of the data are all higher than those of other literatures, and the reasons for the differences of the different literature data are analyzed with the test conditions.Finally, the least squares method is used to fit the Sellmeier equation .