Simplified dual-channel two-wavelength interferometer using a polarized cube beam splitter

Two-wavelength interferometers can extend an unambiguous measurement range; however, they suffer from complex optical configurations. To simplify the optical setup for a two-wavelength common-path off-axis interferometer, we propose a dual-channel two-wavelength interferometer using a polarized cube beam splitter. In contrast with the previously presented two-wavelength common-path off-axis interferometer, the proposed method has a simple setup, in which only one polarized cube beam splitter is inserted into the 4f system. With the help of polarization modulation, two single-wavelength interferograms can be captured simultaneously. Several experimental results are presented to demonstrate the advantages and effectiveness of the proposed method. (C) 2021 Optical Society of America

Automated summary

A dual-channel two-wavelength interferometer using a polarized cube beam splitter is proposed to simplify the optical setup. Compared to previous methods, the proposed approach has a simple setup and can capture two single-wavelength interferograms simultaneously.