A Vortex Digital Holographic Microscopy System Based on Dual Liquid Crystal Spatial Light Modulators

Abstract

The invention relates to a vortex digital holographic microscope system based on a dual liquid crystal spatial light modulator. According to the vortex digital holographic microscope system, an optical path adopts a dual-arm structure of a Michelson interferometer; collimated laser is incident into a first beam splitting prism, and a rear optical path is divided into two paths of a reference arm and an interference arm; an interference arm is sequentially provided with a stage having an electronically controlled displacement stage, an objective lens having an electronically controlled turntable, a first 4f lens, a second beam splitting prism, an electronically controlled field-of-view aperture, a second 4f lens, a pure phase liquid crystal spatial light modulator, a Fourier transform mirror, a third beam splitting prism and a CMOS camera; a reference arm is sequentially provided with an intensity liquid crystal spatial light modulator, a light blocking plate and two mirrors ; and Kohler illumination is adopted for illumination above a sample. The vortex digital holographic microscope system can achieve the purpose of acquiring complex wavefront of the observed sample by imaging atone time.

Description

technical field [0001] The invention relates to the technical field of detection instruments, in particular to a vortex digital holographic microscope system based on a double liquid crystal spatial light modulator. Background technique [0002] Digital holographic microscopy is a detection technology developed in the past two decades. In recent years, micro-digital holography has become a new research hotspot in the world. It has the advantages of high sensitivity, high accuracy, high-resolution imaging, and the convenience and flexibility of hologram storage, reproduction and transmission. It is particularly suitable for microstructural measurements. In 1999, E. Cuche et al. in Switzerland first proposed digital holographic microscopy, which completed the reconstruction of intensity image and phase image through a single hologram, and its lateral resolution reached the micron level, and its longitudinal resolution reached nanoscale. [0003] The main applications of di...

AI Technical Summary

Problems solved by technology

The disadvantage is that the spatial bandwidth of the imaging detector cannot be fully utilized due to the fact that the Fourier spectrum contains the spectrum of the direct light and the conjugate image.

And for samples with a wide spatial spectrum distribution, it will cause spectrum aliasing, and cannot correctly separate the spectrum of direct light and primary light, that is, the sample image

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