In this study, a robust orbital angular momentum (OAM) beams-based Fizeau interferometer is proposed and experimentally demonstrated. It takes full advantages of the Fizeau interferometer and OAM beams, where two conjugated OAM beams propagate in a common optical path. Compared with the conventional dual-path interferometers, Fizeau interferometer has a simpler structure and higher stability, for its common optical path structure is less sensitive to the effects of the external perturbations. As a result, petal-like interference patterns can be stably observed on a CCD. By measuring the rotation angle of the petal-like pattern, tiny displacements ranging from 50 to 800 nm were stably and precisely measured with resolution of 40 pm in simulation and 750 pm in experiment. The proposed system may develop a more compact and stable scheme for the precision measurement in the future.
In this study, a modified OAM Mach-Zehnder (M-Z) interferometer for displacement measurement has been proposed and experimentally proved, where two conjugate OAM beams propagate on two arms respectively. The traditional M-Z OAM interferometer was modified by introducing a reflection module in the reference arm. As a result, the optical path shift mismatched reflections on two arms is eliminated, which improves the quality of the petal-like pattern produced by the interference between two conjugate OAM beams. And a significant rotation angle of the petal-like pattern vs. the tiny displacement of the tested object can be clearly observed. By accurately measuring the rotation angle of the petal-like pattern, a tiny displacement ranging from 50 to 800 nm with resolution of ~50 pm has been measured successfully.
Conference Committee Involvement (3)
Real-time Photonic Measurements, Data Management, and Processing VII
16 October 2023 | Beijing, China
Real-time Photonic Measurements, Data Management, and Processing VI
10 October 2021 | Nantong, JS, China
Real-time Photonic Measurements, Data Management, and Processing V
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