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A method for measuring the pib factor of laser far-field beam quality

A technology of beam quality and measurement method, applied in the field of laser parameter measurement, can solve the problem of inability to obtain the PIV factor in real time, and achieve the effect of real-time measurement, avoiding time synchronization and data fusion, and simplifying operation steps

Active Publication Date: 2022-04-01
NORTHWEST INST OF NUCLEAR TECH
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Problems solved by technology

[0008] The purpose of the present invention is to provide a method for measuring the PIB factor of laser far-field beam quality, to solve the technical problem that the prior art cannot obtain the PIV factor in real time

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  • A method for measuring the pib factor of laser far-field beam quality
  • A method for measuring the pib factor of laser far-field beam quality
  • A method for measuring the pib factor of laser far-field beam quality

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Embodiment Construction

[0037] like Figure 1-3 As shown, the measuring device of the laser far-field beam quality PIB factor of the present invention includes a scanning disk 3 rotating at a high speed around the central axis 5, a photoelectric detection unit, a detection circuit and a casing (not shown in the figure); the detection circuit includes an addition device, data acquisition unit, processing unit;

[0038] The scanning disk 3 is provided with a set of sampling holes 2 and a transmission hole 11 . The far-field laser beam 1 to be measured passes through the sampling holes 2 and the transmission hole 11 and is incident on the photodetection unit on the other side of the scanning disk 3 . The sampling holes 2 are evenly spaced in involutes around the central axis 5. When the scanning disk 3 rotates, the sampling holes 2 realize full-spot scanning sampling of the far-field laser beam 1 to be measured.

[0039] The photoelectric detection unit adopts the method of arranging the fast-response ...

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Abstract

The purpose of the present invention is to provide a method for measuring the PIB factor of laser far-field beam quality, so as to solve the technical problem that the PIV factor cannot be obtained in real time in the prior art. The invention drives the involutely distributed sampling hole array and the transmission hole to scan the incident laser beam through the high-speed rotating scanning disk, and uses a large-area photoelectric detection unit to obtain the light intensity signal, in which the sampling hole captures the most The signal F corresponding to the strong power value circle , and the transmission hole measures the signal F corresponding to the total power of the incident light total , so as to calculate the PIB factor within one revolution of the turntable. At the same time, since the same detector is used to measure the PIB on the same optical path, it is enough to ensure that the detector obtains the relative signal amplitude in the linear range, omitting the power and The calibration link between signals simplifies the operation steps and has real-time measurement.

Description

technical field [0001] The invention belongs to the technical field of laser parameter measurement, and in particular relates to a method for measuring a quality parameter of a laser beam, in particular to a method for the quality PIB factor of a laser far-field beam. Background technique [0002] In laser parameter measurement, beam quality is an important parameter that represents the ability of a laser beam to emit into the far field. Common beam qualities include M2 ​​factor, β parameter, and PIB factor, among which the PIB factor is defined as [0003] PIB=P circle / P total [0004] where P circle is the optical power value with the strongest surrounding radius, P total Refers to the total incident power of the laser. [0005] The PIB factor represents the share of the total power with the strongest power value in the area where the incident laser is focused to a specified surrounding radius, which represents the power concentration and focusability of the laser b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J1/42G01J1/04
CPCG01J1/4257G01J1/0403
Inventor 杨鹏翎陈绍武冯刚栾坤鹏吴勇张磊武俊杰王大辉
Owner NORTHWEST INST OF NUCLEAR TECH
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