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Nano-Displacement Measurement System Using a Modified Orbital Angular Momentum Interferometer.
- Source :
-
IEEE Journal of Quantum Electronics . Apr2022, Vol. 58 Issue 2, p1-5. 5p. - Publication Year :
- 2022
-
Abstract
- In this study, a nano-displacement measurement system is proposed and demonstrated both theoretically and experimentally, which was based on a modified Mach-Zehnder (M-Z) interferometer using two conjugated orbital angular momentum (OAM) beams. In contrast to the previous M-Z-based OAM interferometer, a reflection module is inserted into the reference arm instead of a simple mirror. As a result, the effect of the transverse position-dependence phase-shift caused by the dove prism can be clearly eliminated and a stable and robust (off-axis insensitive) petal-like interference pattern can be obtained successfully. More importantly, a significant rotation angle of the petal-like pattern vs. the tiny displacement of the tested object can be clearly observed. In accordance with the modified measurement setup, a novel phase-demodulation method enabling to quickly and accurately characterize the rotation angle of the petal-like interference-patterns is proposed and demonstrated also. A tiny displacement ranging from 50 to 800 nm with resolution of $\sim 50$ pm has been measured successfully. The proposed approach may find applications in not only the ultra-high precision displacement sensor, but also the temperature, strain, and refractive index sensors. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00189197
- Volume :
- 58
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- IEEE Journal of Quantum Electronics
- Publication Type :
- Academic Journal
- Accession number :
- 155602034
- Full Text :
- https://doi.org/10.1109/JQE.2022.3145840