Full control of the ellipticity of broadband pulses of THz radiation, from linear to left- or right-handed circular polarization, was demonstrated via a four-pixel photoconductive emitter with an integrated achromatic waveplate. Excellent polarization purity and accuracy were achieved, with Stokes parameters exceeding 97% for linear and circular polarization, via a robust scheme that corrected electrically for polarization changes caused by imperfect optical elements. Furthermore, to assess the speed and precision of measurements of the THz polarization, we introduced a figure of merit, the standard error after one second of measurement, found to be 0.047° for the polarization angle.

中文翻译：

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使用光电导像素阵列精确控制太赫兹辐射的椭圆度

通过具有集成消色差波片的四像素光电导发射器证明了对太赫兹辐射宽带脉冲椭圆度的完全控制，从线性到左旋或右旋圆偏振。通过对由不完美光学元件引起的偏振变化进行电气校正的稳健方案，实现了出色的偏振纯度和准确性，线性和圆偏振的斯托克斯参数超过 97%。此外，为了评估太赫兹极化测量的速度和精度，我们引入了品质因数，即测量一秒后的标准误差，发现极化角为 0.047°。