光学
振幅
克尔效应
物理
磁光克尔效应
探测器
相(物质)
噪音(视频)
光强度
光束
计算机科学
量子力学
非线性系统
人工智能
图像(数学)
作者
Lan Luo,Tong Li,Yinghang Jiang,Liang Fang,Bo Liu,Zhiyou Zhang
出处
期刊:Optics Express
[The Optical Society]
日期:2023-04-17
卷期号:31 (9): 14432-14432
被引量:3
摘要
In this paper, we propose a weak measurement method using two pointers to estimate the magneto-optical Kerr angle, which is robust to ellipticity. The double pointers are the amplified displacement shift and intensity of the post-selected light beam, which are the conventional information carried by the light beam and can be directly output by a detector (such as a charge-coupled device). We demonstrate that the product of the double pointers is only related to the phase variation between two basic vectors and independent of the amplitude errors. In the measurement process, when there is an amplitude change or additional amplitude noise between two eigenstates, the product of two pointers is very useful in extracting phase information and shielding amplitude noise. In addition, the product of two pointers has a good linear relationship with the phase variation and a larger dynamic measurement range. This method is applied to measure the magneto-optical Kerr angle of NiFe film. The Kerr angle can be directly obtained using the product of the light intensity and the amplified displacement shift. This scheme is of great significance for the measurement of the Kerr angle of magnetic films.
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