Single-exposure multi-wavelength diffraction imaging with blazed grating

Multi-wavelength diffraction imaging is a lensless, high-resolution imaging technology. To avoid multiple exposures and enable high-speed data collection, here an innovative setup for the single-exposure multi-wavelength diffraction imaging based on a blazed grating is proposed. Since the blazed angle varies with the wavelength, the diffraction patterns for the individual wavelengths can be separated from each other and recorded in a single measurement at one time. A method of high-precision position alignment between different wavelength patterns is proposed in our system to achieve good image quality and high resolution. Experiments on a phase-only USAF resolution target and biological samples were carried out to verify the effectiveness of our proposed method. This proposed setup has such advantages as a simpler structure, fast recording, and algorithm robustness. (C) 2022 Optical Society of America

Automated summary

This paper proposes an innovative setup for single-exposure multi-wavelength diffraction imaging based on a blazed grating, which allows the separation and recording of diffraction patterns for individual wavelengths in a single measurement. The method achieves good image quality and high resolution through high-precision position alignment. Experimental results on resolution targets and biological samples verify the effectiveness of the proposed method, highlighting the advantages of a simpler structure, fast recording, and algorithm robustness.