Zhang Rui, Wang Zhibin, Li Kewu, Chen Yuanyuan, Jing Ning, Qiao Ya, Xie Kunyang
Appl Opt. 2019 Jan 10;58(2):325-332. doi: 10.1364/AO.58.000325.
A fast-axis-adjustable photoelastic modulator (Faa-PEM) is developed and studied, and a spectropolarimetric imaging method using the Faa-PEM and an acousto-optic tunable filter is presented. The Faa-PEM modulation retardation amplitude and fast-axis direction of the Faa-PEM can be adjusted by adjusting the two drives with no mechanical rotation. The I, Q, and U of the Stokes parameters of the incident light can be obtained by adjusting the retardation amplitude and fast-axis direction of the Faa-PEM. This measurement method does not require high-frequency components, and thus a general area array detector can realize the measurement. Theoretical simulation analyses show that the relative errors ΔI/I, ΔQ/Q, ΔU/U, and ΔDoLP/DoLP are less than 5.6% and that the deviation error ΔAoLP is less than 0.2° (at I=1.00, Q=0.707, U=0.707, V=0.0, -0.1°≤Δθ≤0.1°, and -0.05 rad≤Δδ≤0.05 rad). A prototype was developed and tested. The test results show that the average absolute relative error of the degree of linear polarization is 0.36%, and the average absolute deviation error of the angle of linear polarization is 0.048°. The method has potential application value in spectropolarimetric imaging technology.
研制并研究了一种快轴可调光弹调制器（Faa-PEM），并提出了一种利用该Faa-PEM和声光可调滤波器的光谱偏振成像方法。通过调节两个驱动器而无需机械旋转，就可以调节Faa-PEM的调制延迟幅度和快轴方向。通过调节Faa-PEM的延迟幅度和快轴方向，可以获得入射光斯托克斯参数的I、Q和U。这种测量方法不需要高频分量，因此普通的面阵探测器就能实现测量。理论模拟分析表明，相对误差ΔI/I、ΔQ/Q、ΔU/U和ΔDoLP/DoLP小于5.6%，偏差误差ΔAoLP小于0.2°（在I = 1.00、Q = 0.707、U = 0.707、V = 0.0、-0.1°≤Δθ≤0.1°以及-0.05 rad≤Δδ≤0.05 rad时）。研制并测试了一个原型。测试结果表明，线性偏振度的平均绝对相对误差为0.36%，线性偏振角的平均绝对偏差误差为0.048°。该方法在光谱偏振成像技术中具有潜在的应用价值。
