反射z扫描方法测量碲化铋晶体的非线性折射率 |
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引用本文: | 冯栋,曾贤贵.反射z扫描方法测量碲化铋晶体的非线性折射率[J].激光技术,2016,40(3):326-330. |
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作者姓名: | 冯栋 曾贤贵 |
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作者单位: | 1.湖南大学 物理与微电子科学学院 微纳光电器件及应用教育部重点实验室, 长沙 410082 |
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基金项目: | 教育部博士点基金资助项目(20120161120027) |
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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。
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关 键 词: | 非线性光学 非线性折射率 反射z扫描 碲化铋 |
收稿时间: | 2015-03-14 |
Measurement of nonlinear refractive index of bulk bismuth telluride based on reflection z-scan |
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Abstract: | In order to study nonlinear refractive index of bismuth telluride , a 3-D topological insulator , nonlinear refractive index of 800 nm 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 -14 m2/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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