旋转各向异性非线性光学谐波的位置灵敏探测高速测量
High-speed measurement of rotational anisotropy nonlinear optical harmonic generation using position sensitive detection
摘要：
我们提出了一种方法进行高速旋转各向异性非线性光学谐波产生实验在几赫兹的旋转频率通过投影谐波光反射在不同的角度从一个样品到一个固定的位置敏感检测器。该技术的高旋转速度，比现有方法大$10^3$至$10^4$倍，允许通过平均低频激光功率、光束指向和脉冲宽度波动来精确测量样品的晶体学和电子对称性。我们证明了我们的技术的灵敏度，通过解决体四重旋转对称GaAs的[001]轴使用二次谐波产生。
英文摘要：
We present a method of performing high-speed rotational anisotropy nonlinear optical harmonic generation experiments at rotational frequencies of several hertz by projecting the harmonic light reflected at different angles from a sample onto a stationary position sensitive detector. The high rotational speed of the technique, $10^3$ to $10^4$ times larger than existing methods, permits precise measurements of the crystallographic and electronic symmetries of samples by averaging over low frequency laser power, beam pointing, and pulse width fluctuations. We demonstrate the sensitivity of our technique by resolving the bulk four-fold rotational symmetry of GaAs about its [001] axis using second harmonic generation.
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