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Optical Kerr coefficient measurement in coiled high-birefringement fibers

机译：盘绕高双折射光纤的光学Kerr系数测量

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The optical Kerr effect in coiled high-birefringent fibers was measured based on a double-beam polarimetric method. A Q-switched Nd:YAG laser, operating at 1.064 mu m (FWHM of 80 ns at 1 kHz), was used as the pump beam and a cw 0.633-mu m He-Ne laser was used as the probe beam with its polarization fixed at 45 degrees with respect to the birefringent axis whereas orientation of the linearly polarized pump light varied. The phase shifts induced by an intense pump beam in a short bow-tie high-birefringent fiber were determined for different fiber lengths coiled into 15- and 30-cm-diameter drums. It was found that the induced phase shift changes drastically with the state of polarization of the pump light. A strong dependence of the phase shift on orientations of linear pump polarization is attributed to differential losses of eigenmodes peculiar to birefringent axes. Therefore, optical Kerr coefficients remain unchanged regardless of the dependence of the nonlinear response of the coiled high-birefringent fibers on pump polarization. (C) 1998 Optical Society of America. [References: 17]
机译：基于双光束偏振法，测量了卷曲高双折射纤维中的光学克尔效应。使用Q开关的Nd：YAG激光器作为泵浦光束，其工作波长为1.064μm（在1 kHz时的FWHM为80 ns），并且使用cw 0.633μm的He-Ne激光器作为偏振光束。相对于双折射轴固定为45度，而线性偏振泵浦光的方向则有所不同。对于缠绕在直径为15和30厘米的转鼓中的不同纤维长度，确定了在短的蝴蝶结高双折射纤维中由强泵浦光束引起的相移。已经发现，感应的相移随着泵浦光的偏振状态而急剧变化。相移对线性泵浦偏振方向的强烈依赖性归因于双折射轴特有的本征模的微分损耗。因此，不管卷绕的高双折射光纤的非线性响应对泵浦偏振的依赖性如何，光学克尔系数都保持不变。 （C）1998年美国眼镜学会。 [参考：17]

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