Real-time power measurement and control system of high power CO2 lasers

PENG Deng-feng; WANG You-qing; LI Bo

A new kind of real-time power control system of fast flow CO2 lasers is developed to improve the stability of laser power,which is composed of two parts:sampling unit and feedback control unit.In the sampling unit,an infrared detector is used to sample the laser power output from the rear mirror of the resonator.With an attenuator inserted between the detector and the rear mirror to prevent the detector from damage by the laser.In the feedback control system,the sampling signal is compared with the setting reference value,and the discharge current is automatically adjusted to make the output laser power stable around the setting power.The experimental results indicate that this system can automatically control the laser power on line,and greatly enhance the stability and accuracy of the laser power without any accessory inserted in the output laser path.This system has been successfully used in a 4kW fast-flow CO2 laser with much better output power stability of ±0.1%.

Corresponding author: WANG You-qing, yqwang@hust.edu.cn;

1. National Laboratory of Laser Technology, HUST, Wuhan 430074, China

Received Date: 2005-09-20

Accepted Date: 2005-12-23

Available Online: 2006-09-25

Abstract: A new kind of real-time power control system of fast flow CO2 lasers is developed to improve the stability of laser power,which is composed of two parts:sampling unit and feedback control unit.In the sampling unit,an infrared detector is used to sample the laser power output from the rear mirror of the resonator.With an attenuator inserted between the detector and the rear mirror to prevent the detector from damage by the laser.In the feedback control system,the sampling signal is compared with the setting reference value,and the discharge current is automatically adjusted to make the output laser power stable around the setting power.The experimental results indicate that this system can automatically control the laser power on line,and greatly enhance the stability and accuracy of the laser power without any accessory inserted in the output laser path.This system has been successfully used in a 4kW fast-flow CO2 laser with much better output power stability of ±0.1%.

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Reference (10)

[1]	LU L,CHEN Q M.Application of grey prediction control in automatical controlation of CO2 laser[J].Laser Technology,1999,23(4):234～237(in Chinese).
[2]	SHI P Zh.Automatic measurement and control system of gas pressure for fast axial industrial CO2 laser[J].Applied Laser,1997,17(4):170～172(in Chinese).
[3]	XIE Q,LI Sh M,XU Zh et al.Gas control in a fast-flow axial CO2 laser[J].Laser Technology,2002,26(2):135～137(in Chinese).
[4]	ZUO D L,LI Sh M.Review of axial flow CO2 laser[J].Laser Technology,2000,24(1):4～8(in Chinese).
[5]	PENG H,WANG H Sh,LIU J.Application of PLC in the control system of high power CO2 laser[J].Laser Journal,2003,24(6):72～73(in Chinese).
[6]	LIU J,HE Ch Y,LI J R.Power detection and control system for high power CO2 laser[J].Laser Technology,2003,27(6):588～590(in Chinese).
[7]	MAN Ch Y,LU Y D,SHI H M.Laser parameter tasting technology and equipment for laser processing machine[J].Applied Laser,1999,19(5):324～326(in Chinese).
[8]	XU Zh Y,XIONG B,WANG Y et al.Micromachined infrared thermopile detector[J].Journal of Mechanical Strength,2001,23(4):539～542(in Chinese).
[9]	ZHU D H.The principle and interface technique of microcontroller unit[M].Beijing:Publishing House of Electronics Industry,2001.165～185(in Chinese).
[10]	DING F,WANG Y Q,LI B et al.Power control system design of 3kW fast-flow axis high power CO laser[J].Laser Journal,2004,25(5):16～17(in Chinese).

Real-time power measurement and control system of high power CO2 lasers

Abstract

References

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通讯作者: 陈斌, bchen63@163.com

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