A compact synthetic aperture digital holographic microscope with mechanical movement-free beam scanning and optimized active aberration compensation for isotropic resolution enhancement

Abstract

This study proposes and demonstrates a compact synthetic aperture digital holographic microscope (SA-DHM) with mechanical movement-free beam scanning and optimized active aberration compensation. The SA-DHM system is equipped with a phase-only liquid crystal on silicon (LCoS) device as an active optical element to achieve a compact mechanical movement-free beam steering architecture with aberration correction. A rigorous optimization is conducted to modulate the LCoS device using the designed computer-generated holograms (CGH) to generate a high-quality point spread functions (PSF) for a wide range of scanning angles. An accurate aberration correction is studied with and without oil immersed conditions on microscope objective lens. The performance of the proposed method is analyzed with Siemens star target and the results show its potential capability to achieve isotropic resolution enhancement.

Recent Advances and Current Trends in Transmission Tomographic Diffraction Microscopy

“…Spatial light modulators (SLMs) deflect a wave without mechanical motion by directly acting on the wavefront phase of the illuminating beam, effectively allowing for beam angular scanning [ 89 , 90 , 91 , 92 , 93 ], or on the detected field [ 94 ]. Such systems are, however, slower than the fastest resonant galvanometric mirrors.…”

Comparison of Uav Image Spatial Resolution Based on the Siemens Star Target

“…Consequently, the Siemens star target has been utilized to assess the spatial resolution (Cramer, 2020). Deng et al (2020) presented a digital compressed artificial aperture (SA-DHM) holographic microscope with mechanically motionless beam scanning and optimized active deflection compensation. In this regard, the performance of the proposed method is evaluated using the Siemens star target, and the results demonstrate its potential ability to achieve an improvement in isotropic resolution.…”

“…As a result, the compact beam steering system optimization proposed generates highquality images. It has the potential to replace the conventional mechanical scanning mechanism with three significant advantages: no mechanical noise, uniform illumination with compensated scanning aberration at various angles, and a more compact system configuration (Deng, 2020).…”