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High-resolution laser output power variation monitoring device and method

A technology of output power and variation, applied in the field of high-resolution laser output power variation monitoring devices, can solve the problems of low resolution of high-power lasers, low resolution of laser power meters and laser energy meters, and undetectable power meters. , to achieve the effect of improving resolution, simple data processing, and simple and easy measurement method

Inactive Publication Date: 2020-06-05
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Application Information

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Problems solved by technology

However, the resolution can only reach this level in a small range. When measuring high-power lasers, the resolution of laser power meters and laser energy meters is very low.
[0004] The above detection methods have low resolution when measuring high-power lasers. When the beam power changes slightly, the power meter may not be able to detect it.

Method used

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  • High-resolution laser output power variation monitoring device and method
  • High-resolution laser output power variation monitoring device and method

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with example and accompanying drawing, but should not limit the protection scope of the invention with this.

[0025] see first figure 1 , figure 1 It is a structural diagram of the high-resolution laser output power variation monitoring device of the present invention. As can be seen from the figure, the high-resolution laser output power variation monitoring device of the present invention includes a chopper 1, a first photodetector 2, a second photodetector 3, a wedge 4 and a lock-in amplifier 5, and sequentially along the laser output direction It is the chopper 1 and the wedge-shaped sheet 4, the first photodetector 2 is arranged in the reflected light direction of the front surface of the wedge-shaped sheet 4, and the reflection on the rear surface of the wedge-shaped sheet 4 Light direction is provided with described second photodetector 3, and the output terminal of described first photodetec...

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Abstract

The invention discloses a high-resolution laser output power variation monitoring device and method. The device comprises a chopper, a first photoelectric detector, a second photoelectric detector, awedge-shaped sheet and a lock-in amplifier. A photoelectric detector is used for receiving two beams of light, converting the two beams of light into voltage signals and then inputting the voltage signals into thelock-in amplifier, difference operation is carried out, then the size of difference signals is measured, and in addition, synchronizing signals of thechopper are input into the lock-in amplifier to serve as reference signals. According to the invention, the laser output power variation can be effectively monitored, and the monitoring resolution is significantly improved.

Description

technical field [0001] The invention relates to the measurement of laser output power variation, in particular to a high-resolution laser output power variation monitoring device and method Background technique [0002] The laser power change monitoring system has a core position and application value in the safety of laser applications, and is an important direction for the future development of lasers. Laser power is the most important parameter in high-power lasers. Laser output power seriously affects the quality of laser processing. Therefore, in the process of processing, if the measurement accuracy of laser power can be improved, it will play an extremely important role in improving the product qualification rate. . [0003] The traditional laser power detection method is to irradiate laser light onto a laser power meter or a laser energy meter for detection. At present, the minimum display resolution of the laser power meter can reach about 1nW, and the minimum dis...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M11/00G01J1/42
CPCG01J1/4257G01M11/00
Inventor 李大伟胡晨璐刘晓凤赵元安连亚飞朱美萍易葵邵建达
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI