Transmission type digital holography microimaging device based on electrical-controlled switchable focus lens

Abstract

The invention is suitable for the technical field of optical imaging and measuring, and provides a transmission type digital holography microimaging device based on an electrical-controlled switchable focus lens. The transmission type digital holography microimaging device based on the electrical-controlled switchable focus lens comprises a laser device, a first beam splitter, a first light path turning assembly, a second light path turning assembly, a second beam splitter and a camera, wherein the first beam splitter is used for separating laser emitted from the laser device into object light and reference light; the first light path turning assembly is used for guiding the transmitting direction of an object light spherical wave generated after the object light passes through a microobjective to the second beam splitter; the electrical-controlled switchable focus lens in the second light path turning assembly is used for changing a focal length and enabling the curvature of a reference light spherical wave formed after the reference light passes through the electrical-controlled switchable focus lens to be the same as the curvature of the object light spherical wave; the second light path turning assembly is used for guiding the transmitting direction of the reference light spherical wave to the second beam splitter; the second beam splitter is used for outputting the spherical wave; and the camera is used for recording a formed interferogram. By the device, phase distortion can be eliminated.

Description

technical field [0001] The invention belongs to the technical field of optical imaging and measurement, in particular to a transmission digital holographic microscopic imaging device based on an electronically controlled zoom lens. Background technique [0002] As an important means of quantitative phase measurement, digital holographic microscopic imaging technology can use a hologram to independently obtain quantitative amplitude information and phase information of an object at the same time, realizing real-time dynamic, high-resolution, non-invasive measurement. This technology is widely used in stress measurement, living cell observation, three-dimensional measurement of microstructure devices, etc. [0003] Digital holographic microscopy technology can improve the lateral resolution of the measurement system due to the introduction of the microscopic objective lens. Microscopic objectives with different magnifications can be used in the measurement of different sample...

AI Technical Summary

Problems solved by technology

Another method is to introduce an ordinary lens in the reference light path, and adjust the position of the lens to generate spherical waves with different curvatures to match the curvature of the microscope objective lens, but the above two methods require mechanical movement of the lens

[0006] Therefore, in the case of introducing a microscopic objective lens, it is necessary to mechanically move the lens to eliminate the phase distortion caused by the microscopic objective lens; and, when measuring different samples, on the one hand, it is necessary to manually switch between objective lenses with different magnifications for imaging , on the other hand, it is also necessary to move the lens mechanically to eliminate the phase distortion caused by the microscopic objective lens, which cannot guarantee the stability of the system

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