Abstract We propose a novel, low-cost snapshot phase-shifting lateral shearing interferometer (SPLSI) with full-range continuously adjustable lateral shear ratio. A tunable shear plate, consisting of a polarizing beam splitter (PBS) plate and a reflective mirror, separates the orthogonally polarization states of the test wavefront into original and sheared wavefronts. The lateral shear ratio can be tuned by adjusting the spacing between PBS plate and the mirror. A pixelated polarization camera simultaneously captures four π/2 phase-shifted interferograms for phase-shifting interferometric measurement. In addition to tunable shear ratio and snapshot capture of phase-shifted interferograms, one more key feature is that SPLSI can measure the wavefront of low-coherence light. The feasibility of the proposed system is demonstrated experimentally. The proposed system provides a simple, compact, and fast way to achieve the instantaneous phase-shifting lateral shearing interferometric testing of wavefronts with minimal impact from environmental disturbance.

中文翻译：

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快照相移横向剪切干涉仪

摘要 我们提出了一种新型、低成本的快照相移横向剪切干涉仪（SPLSI），具有全范围连续可调横向剪切比。由偏振分束器 (PBS) 板和反射镜组成的可调剪切板将测试波前的正交偏振态分为原始波前和剪切波前。可以通过调整 PBS 板和镜子之间的间距来调整横向剪切比。像素化偏振相机同时捕获四个 π/2 相移干涉图，用于相移干涉测量。除了可调剪切比和相移干涉图的快照捕获之外，另一个关键特性是 SPLSI 可以测量低相干光的波前。实验证明了所提出系统的可行性。