Morris C M, Aguilar R Valdés, Stier A V, Armitage N P
Department of Physics and Astronomy, The Johns Hopkins University, 3400 N Charles St, Baltimore, Maryland 21218, USA.
Opt Express. 2012 May 21;20(11):12303-17. doi: 10.1364/OE.20.012303.
We present high precision measurements of polarization rotations in the frequency range from 0.1 to 2.5 THz using a polarization modulation technique. A motorized stage rotates a polarizer at ~ 80 Hz, and the resulting modulation of the polarization is measured by a lock-in technique. We achieve an accuracy of 0.050° (900 μrad) and a precision of 0.02° (350 μrad) for small rotation angles. A detailed mathematical description of the technique is presented, showing its ability to fully characterize elliptical polarizations from 0.1 to 2.5 THz.
我们使用偏振调制技术，展示了在0.1至2.5太赫兹频率范围内偏振旋转的高精度测量。一个电动平台以约80赫兹的频率旋转一个偏振器，通过锁相技术测量由此产生的偏振调制。对于小旋转角度，我们实现了0.050°（900微弧度）的准确度和0.02°（350微弧度）的精度。文中给出了该技术的详细数学描述，展示了其对0.1至2.5太赫兹椭圆偏振进行全面表征的能力。
