A device and method for controlling the three-dimensional polarization direction of the focused light field of a microscopic objective lens

Abstract

The invention discloses a device and a method for controlling a three-dimensional polarization direction of a microobjective focused light field. The device comprises a beam splitting module, a polarization rotation module, a radial polarized light converter and a beam combiner, wherein the beam splitting module is used for splitting incident coherent linearly polarized light into two beams of linearly polarized light and regulating a light intensity ratio; the polarization rotation module is used for controlling the polarization direction of a first beam of polarized light; the radial polarized light converter is used for converting a second beam of polarized light into radial polarized light; the beam combiner is used for combining emergent linearly polarized light and radial polarized light into coaxial light beams. According to the method disclosed by the invention, an included angle between a focused light field polarization direction and a focusing plane is controlled by regulating a light intensity proportion of the first beam of polarized light and the second beam of polarized light obtained by beam splitting by utilizing the beam splitting module; and a projected direction of the focused light field polarization direction in the focusing plane is controlled by changing a polarization direction of the first linearly polarized light by utilizing the polarization rotation module. The device disclosed by the invention is simple in structure, stable, reliable, high in applicability, easy to realize and easy to operate and has excellent applicability.

Description

technical field [0001] The invention relates to a device and a method for controlling the three-dimensional polarization direction of the focused light field of a microscopic objective lens, and belongs to the technical field of three-dimensional polarization control of the light field. Background technique [0002] As a basic characteristic of light, polarization can provide detection contrast like intensity and phase, so it has very important applications in optical detection, especially in the field of optical microscopy. For example, in mineral identification and some industrial microscopic fields, polarization is introduced into microscopic techniques to enhance contrast (Kai Lijun, Zhan Xiuchun, Fan Xingtao, Wen Hongli, Yuan Jihai. Polarized Energy Dispersive X-ray Fluorescence Spectrometry Determination of Sulfide Copper, lead and zinc in mineral ores[J]. Rock and mineral testing, 32(6), 903-908); and in the field of fluorescence microscopy, the fluorescence polarizat...

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Problems solved by technology

[0006] Among the above two methods, the first method needs to calculate the intensity and phase distribution separately for each different three-dimensional polarization direction, which is complicated to calculate and has poor applicability; the second method controls the polarization direction through phase modulation, and the phase modulation Accuracy and stability are difficult to control in the actual optical path, with practical limitations

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