Method of realizing slow rise and slow drop control on laser output power

Abstract

The invention discloses a method of realizing slow rise and slow drop control on laser output power. An optical gate device capable of adjusting and controlling laser energy output, a high-power laser energy absorption body (10), and a set of optical fiber coupler (11) are included. The method is characterized in that a control motor (1) drives a laser reflector (5) to perform reciprocating motion from a position I to a position II, the rotation speed of the control motor (1) can adjust a laser output power change curve during the process from the position I to the position II, and slow rise is realized; and the rotation speed of the control motor (1) can adjust a laser output power drop curve during the process from the position II to the position I, and slow drop is realized. According to the method of realizing slow rise and slow drop control on laser output power, the phenomenon of laser power overshoot as the solid laser is influenced by a thermal relaxation can be avoided, and the method can be effectively applied to an arc striking process, an arc stopping process and switch optical action in the laser welding field.

Description

technical field [0001] The invention belongs to the field of high-power laser equipment, and relates to a method for switching light on and off of a laser and controlling the slow rise and fall of power. Background technique [0002] In the process of laser application, it is often necessary to perform laser emission and stop operations, especially in the field of welding. When the laser stops, the laser can be absorbed internally. During the process of emission and stop, the laser power needs to be slowly increased and decreased. It is necessary to install an optical shutter device in the laser. [0003] The slow rise and fall of laser power is currently realized by electronic shutter control, and the electronic shutter realizes the control of output optical power by controlling the input electric power. In solid-state lasers, especially rod lasers, due to their obvious thermal relaxation effect, using the control current to control the slow rise and fall of the output pow...

AI Technical Summary

Problems solved by technology

In solid-state lasers, especially rod lasers, due to their obvious thermal relaxation effect, using the control current to control the slow rise and fall of the output power will lead to overshooting of the laser output power, which will affect the laser processing technology, especially the The welding quality at the start and end positions of laser welding, there are pits

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