DMD-based single-pixel off-axis holography for lens phase detection

• Published in: Optics and laser technology Vol. 176; p. 111009
• Main Authors: Tao, Xingfu, Zhai, Aiping, Zhao, Wenjing, Wang, Dong
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.09.2024
• Subjects: Common-path interference; Lens phase detection; Off-axis holography; Wavefront single-pixel imaging; Wavefront single-pixel imaging; Common-path interference; Off-axis holography; Lens phase detection
• ISSN: 0030-3992
• DOI: 10.1016/j.optlastec.2024.111009

•The phase detection of physical lenses based on single-pixel common-path off-axis wavefront imaging is demonstrated.•The Fourier fringe analysis can avoid multi-step phase-shifting interference and reconstruct the target object more quickly.•Compared with the previously proposed SPI-based lens phase detection, the measurement speed of our method is increased by at least three folds.•A simple and cost-effective way for lens detection is proposed, which further propels the SPI technology toward practical application. The lens phase provides useful information about the optical path length, from which other key parameters of a lens can be calculated. Yet, the traditional 2D detector-based phase measurement methods are always limited by the specific spectral response range. Here, phase detection of the physical lens is accomplished via a single-pixel detector. The digital micromirror device (DMD)-based common-path off-axis single-pixel (DCOS) wavefront imaging system is established. Benefiting from the advantages of single-pixel detectors, this method is anticipated to be applied in specialist bands. In this method, the wavefront of a target object is reconstructed quickly by Fourier fringe analysis (FFA) from a hologram, which is obtained by the normal SPI technique. Thus, the measuring speed is at least three times faster than that achieved by multi-step phase-shifting. The average relative errors between the measured value and the calibrated value of focal lengths for 1000-mm and 500-mm optical lenses are 0.254% and 0.982%, respectively. Our work provides a fast, simple, and cost-effective way for phase detection of optical lenses and further enlarges the application scope of single-pixel wavefront imaging.