Thornton Douglas E, Banet Matthias T, Spencer Mark F
Appl Opt. 2021 Sep 1;60(25):G30-G39. doi: 10.1364/AO.427038.
Using wave-optics simulations, this paper defines what subaperture sampling effectively means for digital-holography applications involving atmospheric turbulence. Throughout, we consider the on-axis phase shifting recording geometry (PSRG) and off-axis PSRG, both with the effects of sensor noise. The results ultimately show that (1) insufficient subaperture sampling manifests as an efficiency loss that limits the achievable signal-to-noise ratio and field-estimated Strehl ratio; (2) digital-holography applications involving atmospheric turbulence require at least three focal-plane array (FPA) pixels per Fried coherence length to meet the Maréchal criterion; and (3) off-axis PSRG is a valid and efficient implementation with minor losses, as compared to on-axis PSRG. Such results will inform future research efforts on how to efficiently use the available FPA pixels.
通过波光学模拟，本文定义了子孔径采样对于涉及大气湍流的数字全息应用的有效意义。在整个过程中，我们考虑了轴上相移记录几何结构（PSRG）和离轴PSRG，两者都包含传感器噪声的影响。结果最终表明：（1）子孔径采样不足表现为效率损失，限制了可实现的信噪比和场估计斯特列尔比；（2）涉及大气湍流的数字全息应用每弗里德相干长度至少需要三个焦平面阵列（FPA）像素才能满足马雷夏尔准则；（3）与轴上PSRG相比，离轴PSRG是一种有效的实现方式，损失较小。这些结果将为未来关于如何有效利用可用FPA像素的研究工作提供参考。
