Measurement of nonlinear refractive index of bulk bismuth telluride based on reflection z-scan
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摘要: 为了研究3维拓扑绝缘体碲化铋(Bi2Te3)的非线性光学特性,采用反射z扫描方法,实验测量了800nm飞秒脉冲激光的非线性折射系数。通过理论计算与实验数据拟合获得碲化铋晶体的非线性折射率达到10-14 m2/W数量级,为石英的105倍;随着入射功率的增大,其非线性折射率逐渐减小,在峰值光强达到85GW/cm2后趋于常数不变。结果表明,碲化铋是一种高非线性光学材料,有望应用于全光信号处理、光开关等方面。Abstract: In order to study nonlinear refractive index of bismuth telluride, a 3-D topological insulator, nonlinear refractive index of 800nm femtosecond pulse laser was measured by reflection z-scan method. After theoretical calculation and experimental data fitting, nonlinear refractive index of bismuth telluride crystal could reach the order of magnitude of 10-14m2/W, 105 times of that of quartz. Nonlinear refractive index decreased with the increase of incident power. Until peak intensity reached 85GW/cm2, nonlinear refractive index tended to be a constant. The results show that bismuth telluride is a remarkable nonlinear optical material which has huge potential in the application of all-optical signal processing and optical switching.
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Keywords:
- nonlinear optics /
- nonlinear refractive index /
- reflection z-scan /
- bismuth telluride
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