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Spatially resolved photodiode response for simulating precise interferometers

机译：用于模拟精密干涉仪的空间分辨光电二极管响应

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Quadrant photodiodes (QPDs) are used in laser interferometry systems to simultaneously detect longitudinal displacement of test masses and angular misalignment between the two interfering beams. The latter is achieved by means of the differential wavefront sensing (DWS) technique, which provides ultra-high precision for measuring angular displacements. We have developed a setup to obtain the spatially resolved response of QPDs that, together with an extension of the simulation software IfoCAD, allows us to use the measured response in simulations and accurately predict the desired longitudinal and DWS phase observables. Three different commercial off-the-shelf QPD candidates for space-based interferometry were characterized. The measured response of one QPD was used in optical simulations. Nonuniformities in the response of the device and crosstalk between segments do not introduce significant variations in the longitudinal and DWS measurands with respect to the standard case when a uniform QPD without crosstalk is used. (C) 2016 Optical Society of America
机译：象限光电二极管（QPD）用于激光干涉测量系统，以同时检测测试质量的纵向位移和两个干涉光束之间的角度未对准。后者是通过差分波前感测（DWS）技术实现的，该技术为测量角位移提供了超高精度。我们已经开发出一种设置，可以获取QPD的空间分辨响应，并结合仿真软件IfoCAD进行了扩展，使我们能够在仿真中使用测得的响应，并准确预测所需的纵向和DWS相位观测值。表征了三种不同的用于天基干涉测量的现成商用QPD候选物。一种QPD的测量响应用于光学仿真。当使用没有串扰的统一QPD时，与标准情况相比，设备响应和段之间的串扰的不均匀性不会在纵向和DWS测量值中引入明显的变化。 （C）2016美国眼镜学会

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