Measuring the Faraday effect in olive oil using permanent magnets and Malus' law
Measuring the Faraday effect in olive oil using permanent magnets and Malus' law
复制标题
使用永磁体和马吕斯定律测量橄榄油中的法拉第效应
DOI：
10.1088/1361-6404/ab50dd
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发表时间：
2020
影响因子：
0.7
通讯作者：
Carr D
中科院分区：
文献类型：
--
作者：
Carr D
我们提出了一个简单的永久磁铁设置，可用于测量气体，液体和固体中的法拉第效应。通过将透射曲线拟合为偏振器角度的函数（Malus定律），我们对激光功率的短期波动进行平均，并且可以提取小至±50 μ rad的相移。我们专注于测量橄榄油中的法拉第效应，并发现在约20 C下，波长为659.2 nm时的费尔德系数为V=<$192<$ ± <$1 deg T− 1 m− 1。我们证明了Verdet系数可以用Drude类色散定律A/（λ2<$− <$l02）拟合，其中系数A<$ =<$7.9<$ ± <$0.2<$ ×<$107 deg T− 1 m− 1 nm 2，λ0<$=< $142<$± < $13 nm。
We present a simple permanent magnet set-up that can be used to measure the Faraday effect in gases, liquids and solids. By fitting the transmission curve as a function of polarizer angle (Malus, law) we average over short-term fluctuations in the laser power and can extract phase shifts as small as±50 μrads. We have focused on measuring the Faraday effect in olive oil and find a Verdet coefficient of V= 192± 1 deg T− 1 m− 1 at approximately 20 C for a wavelength of 659.2 nm. We show that the Verdet coefficient can be fit with a Drude-like dispersion law A/(λ2− l0 2) with coefficients A= 7.9± 0.2× 107 deg T− 1 m− 1 nm2 and λ0= 142± 13 nm.