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首页> 外文期刊>Optical engineering >Group and phase birefringence dispersion of pure and doped lithium niobate crystals obtained by analysis of interference pattern observed behind a plane polariscope
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Group and phase birefringence dispersion of pure and doped lithium niobate crystals obtained by analysis of interference pattern observed behind a plane polariscope

机译：通过分析平面偏光镜后面观察到的干扰图案获得的纯净锂铌酸铌晶体的组和相双折射分散

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摘要

A sample of lithium niobate crystal with known thickness is set on a vertical rotary stage, placed in between two crossed plane polarizers and illuminated by a collimated beam of white light. The sample is rotated to an appropriate position, and interference fringes observed behind an analyzer are recorded by a fiber-optic spectrometer. The recorded channeled spectrum is then analyzed, and from measured positions of interference minima (dark fringes) and known crystal's thickness, the group birefringence of the crystal sample is obtained as a function of wavelength. The fringe order versus position of the fringe within the spectrum is fitted by appropriate dispersion function, and as the result phase birefringence as a function of wavelength is found. The measurement is performed for a sample declared as undoped, a sample doped with 0.025 wt. % of Fe, and a sample doped with 0.025 wt. % of Fe and 0.075 wt. % of Mn in the wavelength ranges (470 to 780) nm and (900 to 1700) nm. A good agreement between group birefringence dispersion obtained from positions of interference minima and known sample's thickness and that calculated from phase birefringence dispersion given by Sellmeier dispersion model (used for undoped sample) and Cauchy model (used for doped samples) is found.
机译：具有已知厚度的铌酸锂晶体样品在垂直的旋转台上设定，放置在两个交叉的平面偏振器之间，并由准直的白光光束照射。将样品旋转到适当的位置，并且通过光纤光谱仪记录分析仪后面观察到的干涉条纹。然后分析所记录的信道的光谱，并且从测量的干扰最小值（暗圈）和已知的晶体厚度的位置，获得晶体样品的基团双折射作为波长的函数。在光谱内的边缘顺序与边缘内的位置通过适当的色散函数装配，并且由于找到了作为波长函数的结果相双折射。对声明的样品进行测量，该样品未透明，样品掺杂0.025重量％。占Fe的％，以及掺杂0.025重量的样品。 Fe和0.075重量％的％。波长范围（470至780）nm和（900至1700）nm的Mn％。找到从干扰最小和已知样品厚度的位置获得的组双折射分散的良好一致性，并且发现由通过销售分散模型（用于未掺杂的样品）和Cauchy模型（用于掺杂样品）的相双折射色散计算。

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