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A Method for Absolute Measurement of Power Distribution Curve in Laser Far Field Barrel

A distribution curve and absolute measurement technology, which is applied to the absolute measurement of the power distribution curve in the laser far-field barrel, and the measurement of the laser beam quality parameters. , to save the cost of data collection, simplify the calculation process, and ensure the effect of real-time

Active Publication Date: 2021-12-31
NORTHWEST INST OF NUCLEAR TECH
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Problems solved by technology

[0005] The purpose of the present invention is to provide a device and method for absolute measurement of the power distribution curve in the laser far-field bucket to solve the technical problem that the existing measurement scheme does not provide a specific restoration method for the spot image and the acquisition scheme of the power distribution curve in the bucket

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  • A Method for Absolute Measurement of Power Distribution Curve in Laser Far Field Barrel
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  • A Method for Absolute Measurement of Power Distribution Curve in Laser Far Field Barrel

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[0036] Such as Figure 1-3 As shown, the absolute measurement device of the power distribution curve in the laser far-field barrel of the present invention includes a scanning disk 3, a photoelectric detection unit, a detection circuit and a casing (not shown in the figure) that rotate at a high speed around the central rotating shaft 5, and detects The circuit includes an inverter, an adder, a data acquisition unit and a processing unit; a set of sampling holes 2 arranged uniformly in involute line is arranged on the scanning disc 3, and the far-field laser beam 1 to be measured passes through the sampling holes 2 and enters the The photodetection unit on the other side of the disk 3 is scanned.

[0037] The photoelectric detection unit adopts the method of arranging a fast-response photodetector 8 behind the integrating sphere 6. This is because the working principle of the system determines that the real-time detection of the sampled light beam requires the use of a large-a...

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Abstract

The purpose of the present invention is to provide an absolute measurement method of the power distribution curve in the laser far-field bucket to solve the technical problem that the existing measurement scheme does not provide a specific restoration method of the spot image and the acquisition scheme of the power distribution curve in the bucket. In the present invention, the sampling hole array in involute distribution is driven by a high-speed rotating scanning disk to scan the incident laser beam as a whole, and a large-area photoelectric detection unit is used to obtain the light intensity signal, and then the maximum power value of one rotation is obtained. That is, the power value in the bucket; at the same time, the time series signal is restored to the light spot to obtain the power density distribution parameters of the frame light spot, and the relative value of the power distribution in the bucket is obtained by gradually changing the surrounding radius on the light spot image, and then according to the actual measurement. The maximum power value in the bucket is calibrated, and then the absolute power distribution curve in the bucket is obtained.

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 an absolute measurement method for a power distribution curve in a laser far-field barrel. Background technique [0002] In the measurement of laser parameters, the power in the barrel is an important parameter, indicating the ability of the laser beam to emit to the far field. The power in the bucket refers to the maximum power value after the integration of the laser spot within a certain surrounding radius, and the power distribution curve in the bucket refers to the change curve of the power in the bucket when the surrounding radius changes from small to large, which represents the laser beam Power concentration and focusability in the far field. [0003] The existing absolute measurement method of the power distribution curve in the barrel is to set an iris aperture ...

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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 陈绍武杨鹏翎栾坤鹏赵海川王平谢贤忱王振宝冯国斌
Owner NORTHWEST INST OF NUCLEAR TECH
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