Interferometry with sinusoidal phase modulation method for measuring the phase of optical vortex

Haosen Pu; Osami Sasaki; Takamasa Suzuki; Samuel Choi

doi:10.1117/12.2660168

8 December 2022 Interferometry with sinusoidal phase modulation method for measuring the phase of optical vortex

Haosen Pu, Osami Sasaki, Takamasa Suzuki, Samuel Choi

Proceedings Volume 12480, Optical Technology and Measurement for Industrial Applications Conference 2022; 124800B (2022) https://doi.org/10.1117/12.2660168
Event: Optics and Photonics International Congress, 2022, Yokohama, Japan

Abstract

The interferometry with sinusoidal phase modulation method (SPM) has been widely used in optical measurement for detecting the interference phase which traces the surface profile of objects. In this research, we employed the SPM interferometry to measure vortex beams (VBs), which have equiphasic wavefronts with spiral phase structure due to orbital angular momentum. It is increasingly important to accurately measure the phase distribution as well as the topological charge of the optical vortex. High-order VBs were generated by computer-generated holograms from a spatial light modulator. We have successfully measured the phase distribution of VB by interfering a Gaussian beam from a laser source using the SPM interferometry. The maximum standard deviation for determining of obtained topological charges was estimated to be approximately 0.016.

Citation Download Citation

Haosen Pu, Osami Sasaki, Takamasa Suzuki, and Samuel Choi "Interferometry with sinusoidal phase modulation method for measuring the phase of optical vortex", Proc. SPIE 12480, Optical Technology and Measurement for Industrial Applications Conference 2022, 124800B (8 December 2022); https://doi.org/10.1117/12.2660168

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KEYWORDS

Spiral phase plates

Interferometry

Phase shift keying

Scanning probe microscopy

Optical vortices

Phase measurement

Spatial light modulators

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