Harter J W, Niu L, Woss A J, Hsieh D
Opt Lett. 2015 Oct 15;40(20):4671-4. doi: 10.1364/OL.40.004671.
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 fourfold rotational symmetry of GaAs about its [001] axis using second-harmonic generation.
我们提出了一种通过将从样品以不同角度反射的谐波光投射到固定的位置敏感探测器上，在几赫兹的旋转频率下进行高速旋转各向异性非线性光学谐波产生实验的方法。该技术的高旋转速度比现有方法大10³至10⁴倍，通过对低频激光功率、光束指向和脉冲宽度波动进行平均，能够精确测量样品的晶体学和电子对称性。我们通过使用二次谐波产生解析砷化镓围绕其[001]轴的体四重旋转对称性，证明了我们技术的灵敏度。
