阅读说明：本技术 一种利用dmd进行实时斯托克斯偏振测量的方法及装置 (Method and device for carrying out real-time Stokes polarization measurement by using DMD ) 是由 卡梅隆·罗萨莱斯·古兹曼 赵波 胡晓博 朱智涵 高玮 于 2019-09-17 设计创作，主要内容包括：本发明提供了一种利用DMD进行实时斯托克斯偏振测量的方法及装置。该方法基于利用DMD进行实时斯托克斯偏振测量的方法所采用的装置实现；该装置包括二分之一波片、q板、加载有数字光栅的DMD、第一透镜、滤波器、第二透镜、第一线性偏振片、第二线性偏振片、第二四分之一波片、第三线性偏振片、第三透镜以及CCD；线偏振高斯光通过二分之一波片和q板转化为CV光,通过DMD分成四个相同部分,四束光分别用于测量所需的总光强、H方向光强、D方向光强和R方向光强。本发明的上述技术,能够解决动态SOP的实时重建问题,通过将动态SOP投影到DMD上,实现了实时斯托克斯偏振测量。(The invention provides a method and a device for carrying out real-time Stokes polarization measurement by utilizing a DMD (digital micromirror device). The method is realized based on a device adopted by the method for carrying out real-time Stokes polarization measurement by utilizing the DMD; the device comprises a half wave plate, a q plate, a DMD loaded with a digital grating, a first lens, a filter, a second lens, a first linear polarizer, a second quarter wave plate, a third linear polarizer, a third lens and a CCD (charge coupled device); the linearly polarized Gaussian light is converted into CV light through the half wave plate and the q plate, the CV light is divided into four same parts through the DMD, and the four beams of light are used for measuring total light intensity, light intensity in the H direction, light intensity in the D direction and light intensity in the R direction respectively. The technology of the invention can solve the problem of real-time reconstruction of the dynamic SOP, and realizes real-time Stokes polarization measurement by projecting the dynamic SOP onto the DMD.)

1. A method for carrying out real-time Stokes polarization measurement by utilizing a DMD is characterized in that the method is realized based on a device adopted by the method for carrying out real-time Stokes polarization measurement by utilizing the DMD;

the device adopted by the method for carrying out real-time Stokes polarization measurement by utilizing the DMD comprises a half wave plate, a q plate, the DMD loaded with a digital grating, a first lens, a filter, a second lens, a first linear polaroid, a second quarter wave plate, a third linear polaroid, a third lens and a CCD (charge coupled device);

wherein the angle of the first linear polarizer is 0⁰The angle of the second linear polarizer is 45 degrees⁰The angle of the third linear polarizer is 90 degrees⁰The angle of the second quarter-wave plate is 45⁰；

The method for carrying out real-time Stokes polarization measurement by utilizing the DMD comprises the following steps:

converting linearly polarized Gaussian light into CV light through a half wave plate and a q plate, enabling the CV light to firstly pass through the DMD loaded with the digital grating to divide the CV light into four same parts, and generating four beams of light which sequentially pass through the first lens, the filter and the second lens, wherein the first lens and the second lens are used for collimating the four beams of light, the filter is used for carrying out spatial filtering on the four beams of light, the four beams of light are transmitted along parallel paths after passing through the first lens, the filter and the second lens, and the four beams of light are respectively used for measuring required total light intensity, H-direction light intensity, D-direction light intensity and R-direction light intensity;

among the four light beams propagating along the parallel paths, the first path obtains the light intensity in the H direction through the first linear polarizer, the third path obtains the light intensity in the D direction through the second linear polarizer, the second path obtains the light intensity in the R direction through the second quarter-wave plate and the third linear polarizer, the fourth path is used for obtaining the total light intensity, and the four light beams are converged on the CCD through the third lens for simultaneous measurement.

2. The method of real-time stokes polarization measurement using a DMD as recited in claim 1, wherein four multi-path diffraction gratings with unique spatial frequencies loaded on the DMD form a digital hologram, and when the input CV light is incident on the DMD, the input CV light is split into four beams that are identical to the SOP of the input CV light.

3. The method for real-time stokes polarization measurement using a DMD as recited in claim 1 or 2, wherein the focal lengths of the first lens, the second lens and the third lens are all equal.

4. Method for real-time stokes polarization measurement using a DMD according to any of claims 1-3, wherein an adjusting unit is further arranged between the q-plate and the DMD for changing the SOP of the CV light.

5. The method for real-time stokes polarization measurement using a DMD as recited in claim 4, wherein the adjusting unit is a first adjusting unit or a second adjusting unit;

the first adjusting unit comprises a rotating half-wave plate;

the second adjusting unit comprises a first quarter-wave plate and a nonlinear crystal.

6. A device for real-time Stokes polarization measurement by utilizing a DMD is characterized by comprising a half wave plate, a q plate, the DMD loaded with a digital grating, a first lens, a filter, a second lens, a first linear polarizer, a second quarter wave plate, a third linear polarizer, a third lens and a CCD;

wherein the angle of the first linear polarizer is 0⁰The angle of the second linear polarizer is 45 degrees⁰The angle of the third linear polarizer is 90 degrees⁰The angle of the second quarter-wave plate is 45⁰；

The method for carrying out real-time Stokes polarization measurement by utilizing the DMD comprises the following steps:

converting linearly polarized Gaussian light into CV light through a half wave plate and a q plate, enabling the CV light to firstly pass through the DMD loaded with the digital grating to divide the CV light into four same parts, and generating four beams of light which sequentially pass through the first lens, the filter and the second lens, wherein the first lens and the second lens are used for collimating the four beams of light, the filter is used for carrying out spatial filtering on the four beams of light, the four beams of light are transmitted along parallel paths after passing through the first lens, the filter and the second lens, and the four beams of light are respectively used for measuring required total light intensity, H-direction light intensity, D-direction light intensity and R-direction light intensity;

among the four light beams propagating along the parallel paths, the first path obtains the light intensity in the H direction through the first linear polarizer, the third path obtains the light intensity in the D direction through the second linear polarizer, the second path obtains the light intensity in the R direction through the second quarter-wave plate and the third linear polarizer, the fourth path is used for obtaining the total light intensity, and the four light beams are converged on the CCD through the third lens for simultaneous measurement.

7. The device according to claim 6, wherein the DMD is loaded with four multi-path diffraction gratings with unique spatial frequencies to form a digital hologram, and when the input CV light is incident on the DMD, the digital hologram is divided into four beams identical to the SOP of the input CV light.

8. The device according to claim 6 or 7, wherein the focal lengths of the first lens, the second lens and the third lens are all equal.

9. Device for real-time stokes polarization measurement using a DMD according to any of claims 6-8, wherein an adjusting unit is further arranged between the q-plate and the DMD for changing the SOP of the CV light.

10. The device for real-time stokes polarization measurement using a DMD as recited in claim 9, wherein the adjusting unit is a first adjusting unit or a second adjusting unit;

the first adjusting unit comprises a rotating half-wave plate;

the second adjusting unit comprises a first quarter-wave plate and a nonlinear crystal.