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A method and system for measuring the polarization state of a sample based on a Wollaston prism

A Wollaston prism and polarization state technology, applied in the fields of optics and digital holography, can solve the problems of limited accuracy and cumbersome process, and achieve the effect of improving the ability of real-time measurement

Active Publication Date: 2020-11-20
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the commonly used digital holography can only obtain the amplitude and phase information of the light field to be measured, and the polarization state information carried by the object is also one of its most important properties.
The Mueller microscope currently used in biology can measure the Mueller matrix of biological tissues, but it needs to adjust the polarization state of the incident light multiple times and record multiple sets of intensity information to decipher the polarization information of biological tissues. The process is very cumbersome and the accuracy is limited.

Method used

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  • A method and system for measuring the polarization state of a sample based on a Wollaston prism
  • A method and system for measuring the polarization state of a sample based on a Wollaston prism
  • A method and system for measuring the polarization state of a sample based on a Wollaston prism

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Embodiment 1

[0032] Embodiment 1: A transmission type sample polarization state information measurement system based on a Wollaston prism designed by the present invention such as figure 2 As shown, the workflow is as follows:

[0033] The light emitted by the laser 1 is collimated into a beam of parallel light by the lens group 2, modulated by the polarizer 3, and enters the non-polarizing beam-splitting prism 4, and is divided into two beams of parallel light by the non-polarizing beam-splitting prism 4, one of which is captured by the reflector 5 After reflection, it is modulated by the transmissive sample 6 as the object beam and enters the non-polarizing beam-splitting prism 8, and another beam of light is reflected by the mirror 7 and then enters the non-polarizing beam-splitting prism 8 as a reference beam. The use of the non-polarizing beam-splitting prism 8 makes the reference beam The object beam and the object beam are simultaneously incident on the Wollaston prism (the angle b...

Embodiment 2

[0035] Embodiment 2: A reflective sample polarization state information measurement system based on a Wollaston prism designed by the present invention The optical path is as follows image 3 As shown, the workflow is as follows:

[0036] The light emitted by the laser 1 is collimated into a beam of parallel light by the lens group 2, and the polarization state is modulated by the polarizer 3, and then enters the non-polarizing beam-splitting prism 4, and is divided into two beams of parallel light by the non-polarizing beam-splitting prism 4, one of which is filtered by the non-polarizing beam-splitting prism 4. After being reflected by the polarizing beamsplitter prism 5, it is reflected by the reflective sample 6 as the object beam and enters the non-polarizing beam-splitting prism 8, and the other beam of light is incident on the non-polarizing beam-splitting prism 8 as a reference beam after being reflected by the reflector 7, and the non-polarizing beam-splitting prism 8 ...

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Abstract

The invention discloses a method and system for measuring the full polarization state of a sample using a Wollaston prism. The parallel light collimated by a collimating lens is divided into two beams of light by a non-polarizing beam splitting prism, and one beam of light passes through the sample As the object light, the other beam of light is used as the reference light, and the two beams of light are reflected by the reflector and then merged through the non-polarizing beam splitting prism. After the reference light and the object light pass through the Wollaston prism, two interference patterns with orthogonal polarization states are formed at different positions. Two holograms are recorded on one picture using the camera. The computer extracts and obtains two holograms from one recorded image, performs numerical reconstruction, and finally obtains the amplitude and phase information corresponding to the object light passing through the sample, and obtains the polarization state information of the sample through computer processing. Compared with the use of traditional Mueller microscopes, it avoids multiple acquisitions being affected by the environment, and improves the stability and real-time measurement capabilities of the system.

Description

technical field [0001] The invention relates to the field of optics, in particular to the field of digital holography technology. Background technique [0002] Digital holography is widely used in fields such as flow field measurement, deformation measurement, shape analysis, and microscopic imaging due to its advantages of fast real-time, non-destructive, non-invasive, and full-field measurement. However, the commonly used digital holography can only obtain the amplitude and phase information of the light field to be measured, and the polarization state information carried by the object is also one of its most important properties. The Mueller microscope currently used in biology can measure the Mueller matrix of biological tissue, but it needs to adjust the polarization state of the incident light multiple times and record multiple sets of intensity information to decipher the polarization information of biological tissue. The process is very cumbersome and the accuracy is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J4/00
CPCG01J4/00G01J4/04
Inventor 邸江磊豆嘉真王凯强赵建林
Owner NORTHWESTERN POLYTECHNICAL UNIV
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