Double-path power negative feedback system for laser processing equipment

Abstract

Disclosed is a double-path power feedback system for a laser processing device. Besides that a laser output power detection circuit (10) is arranged at an output end side of a laser (2), a processing point is provided with a processing point laser output power detection circuit (6), whose input end is connected with an output end of a laser emitting unit (5) through a splitting and coupling lens, and whose output end is separately connected with a negative feedback control circuit (9) having a feedback switchover function and a laser power supply control circuit, and is used for detecting laser output power of at least one processing point in real time, and outputting a negative feedback thereof to a control end of the laser power supply control circuit in real time, thereby implementing double-path power negative feedback, so as to control the laser output power. The system can significantly improve the laser output stability and the laser power control accuracy, obviously improve the laser processing quality, and effectively solve the problem of unstable output power caused by that a single power negative feedback closed-ring control system of a laser process device does not comprise a laser incidence unit (3), an optical fiber (2) and a laser emitting unit (5) of an output optical fiber coupling transmitting system.

Description

technical field [0001] The invention relates to laser processing, in particular to a dual-path power negative feedback system for laser processing equipment. Background technique [0002] Most of the existing laser processing equipment is equipped with a laser power detection device at the output end of the laser cavity, and the detected laser power is negatively fed back to the control end of the laser power control component in real time to control the size of the laser output, thereby improving the stability of the laser output sex. Since this laser power negative feedback closed-loop control system does not include the laser incident unit, optical fiber and laser exit unit in the output fiber coupling transmission system between the laser cavity mirror and the laser processing point, and the damage of these parts cannot be judged, therefore, Seriously restricting the improvement of laser output stability at the processing point. Contents of the invention [0003] The...

AI Technical Summary

Problems solved by technology

Since this laser power negative feedback closed-loop control system does not include the laser input unit, optical fiber and laser output unit in the output fiber coupling transmission system between the laser cavity mirror and the laser processing point, and the damage of these parts cannot be judged, therefore, Seriously restricts the improvement of laser output stability at the processing point

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