Rapid pulse laser polarization degree measurement device

Abstract

The invention relates to a rapid pulse laser polarization degree measurement device and belongs to the technical field of laser. The device comprises a laser (1), a beam shaping lens (2), a Glan-Taylor polarizer (3), a depolarizing beam splitter prism (4), a polarizing beam splitter prism (5), a photoelectric detector A (6) and a photoelectric detector B (7). According to the device, by adoption of the polarizing beam splitter prism, horizontal polarization P light and vertical polarization S light in back scattering light beams of a tested sample can be separated, a horizontal polarization P light voltage value VP and a vertical polarization S light voltage value VS in the light beams are measured, and the back scattering polarization degree of the tested sample is calculated by utilizing (VP-VS) / (VP+VS), so that the polarization degree of the tested sample is rapidly measured. In a measurement process, the error brought by the operation of respectively acquiring the horizontal polarization P light and the vertical polarization S light by regulating an analyzer is avoided, so that the measurement precision is high.

Description

technical field [0001] The invention relates to a fast pulse laser polarization degree measuring device, which belongs to the field of laser technology. Background technique [0002] At present, the commonly used measuring devices for the degree of polarization of pulsed lasers are as follows: figure 1 As shown, the pulsed laser light emitted by the laser 11 passes through the polarizer 12 to obtain linearly polarized light. After the linearly polarized light is depolarized by the sample 15 to be tested, part of the backscattered light enters the photodetector 14 through the analyzer 13 . By rotating the analyzer 13 , the separation of the horizontally polarized P light and the vertically polarized S light in the backscattered light of the sample 15 is realized. This measurement device only uses a photodetector 14, so each measurement can only obtain a measurement value in the horizontally polarized P light or the vertically polarized S light, so the horizontally polarized ...

AI Technical Summary

Problems solved by technology

This measurement device only uses a photodetector 14, so each measurement can only obtain a measurement value in the horizontally polarized P light or the vertically polarized S light, so the horizontally polarized P in the backscattered light of the sample 15 to be measured must be obtained. Light and vertically polarized S light can only be achieved by two steps

At the same time, in the process of adjusting the polarizer 13, there is a certain error, so that the measured polarization degree is also inaccurate

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