用于多轴旋转各向异性二次谐波发生实验的自动偏振旋转。

IF 1.3 4区 工程技术 Q3 INSTRUMENTS & INSTRUMENTATION
Karna A Morey, Bryan T Fichera, Baiqing Lv, Zonqi Shen, Nuh Gedik
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引用次数: 0

摘要

旋转各向异性二次谐波发生(RA-SHG)是一种用于探测凝聚态系统对称性的非线性光学技术。测量 SHG 感度对一个或多个外部参数(主要是应变、场、温度或时间延迟)的依赖性,是探测量子材料复杂相位的一种极其强大的方法。在实验中,要提取有关 SHG 感度张量的最大信息,需要测量 S 极化和 P 极化的输入和输出组合,这自然需要在数据收集过程中旋转极化器。对于多轴实验来说,由于偏振旋转通常需要人工完成,因此这已被证明是一项挑战。将这一过程自动化可以消除人力限制,减少低频噪声带来的不确定性,并扩大可收集的多轴数据集的类型;然而,由于装置内的几何限制,这一过程很难实现。在这项工作中,我们设计并实现了用于多轴 RA-SHG 的低成本、高保真自动偏振旋转器。这些偏振旋转器利用电气滑环将电源传输到旋转 RA-SHG 光学装置,并利用微型步进电机进行偏振旋转。我们在非中心对称半导体砷化镓的时间分辨 RA-SHG 测量中演示了这一自动化系统。对于上述多轴测量,该自动化系统允许在更长的时间段内进行数据平均,大大加快了数据收集速度,并扩展了设置测量能力。这最终为利用多个可调外部参数探测量子材料开辟了新的领域。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Automated polarization rotation for multi-axis rotational-anisotropy second harmonic generation experiments.

Rotational anisotropy second harmonic generation (RA-SHG) is a nonlinear optical technique used to probe the symmetry of condensed matter systems. Measuring the dependence of the SHG susceptibility on one or more external parameters, notably strain, field, temperature, or time delay, is an extremely powerful way to probe complex phases of quantum materials. Experimentally, extracting maximal information about the SHG susceptibility tensor requires measurements of S and P polarized input and output combinations, which naturally involves the rotation of the polarizers during data collection. For multi-axis experiments, this has proved challenging since polarization rotation is typically done manually. Automating this process eliminates labor constraints, reduces uncertainty due to low-frequency noise, and expands the type of multi-axis datasets that can be collected; however, it is difficult due to geometrical constraints within the setup. In this work, we design and implement low-cost, high-fidelity automated polarization rotators for use in multi-axis RA-SHG. These polarization rotators utilize an electrical slip ring to transfer power to the rotating RA-SHG optical setup as well as a miniature stepper motor to perform the polarization rotation. We demonstrate this automated system in time-resolved RA-SHG measurements in the non-centrosymmetric semiconductor GaAs. For the multi-axis measurements described above, this automated system permits data averaging over longer periods, vastly expedites data collection, and expands the setup measurement capability. This ultimately opens new frontiers in probing quantum materials using multiple tunable external parameters.

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来源期刊
Review of Scientific Instruments
Review of Scientific Instruments 工程技术-物理:应用
CiteScore
3.00
自引率
12.50%
发文量
758
审稿时长
2.6 months
期刊介绍: Review of Scientific Instruments, is committed to the publication of advances in scientific instruments, apparatuses, and techniques. RSI seeks to meet the needs of engineers and scientists in physics, chemistry, and the life sciences.
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