A modified OAM Mach-Zehnder interferometer for displacement measurement

Chenji Guo; Xunhua Huang; Yuanyuan Hao; Huali Lu; Hua Zhao

doi:10.1117/12.2601370

9 October 2021 A modified OAM Mach-Zehnder interferometer for displacement measurement

Chenji Guo, Xunhua Huang, Yuanyuan Hao, Huali Lu, Hua Zhao

Proceedings Volume 11902, Real-time Photonic Measurements, Data Management, and Processing VI; 1190217 (2021) https://doi.org/10.1117/12.2601370
Event: SPIE/COS Photonics Asia, 2021, Nantong, JS, China

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Abstract

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.

Citation Download Citation

Chenji Guo, Xunhua Huang, Yuanyuan Hao, Huali Lu, and Hua Zhao "A modified OAM Mach-Zehnder interferometer for displacement measurement", Proc. SPIE 11902, Real-time Photonic Measurements, Data Management, and Processing VI, 1190217 (9 October 2021); https://doi.org/10.1117/12.2601370

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