Beam transformation of diode lasers used in laser processing

LIU You-qiang; CAO Yin-hua; PAN Fei; GAO Jing; QIN Wen-bin; LIU Shi-guang; WANG Zhi-yong

doi:10.3788/OPE.20122003.0455

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Beam transformation of diode lasers used in laser processing

Article | 更新时间：2020-08-12

- Beam transformation of diode lasers used in laser processing
- Optics and Precision Engineering Vol. 20, Issue 3, Pages: 455-461(2012)
- 作者机构：
  
  1. 北京工业大学激光工程研究院北京,100124
  2. 山东昌邑供电公司,山东潍坊,261300
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20122003.0455
  CLC： TG665;TN248.4
- Received：11 October 2011，
  
  Revised：03 November 2011，
  
  Published Online：22 March 2012，
  
  Published：22 March 2012
- 稿件说明：
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刘友强, 曹银花, 潘飞, 高静, 秦文斌, 刘世光, 王智勇. 激光加工用半导体激光器的光束变换[J]. 光学精密工程, 2012,(3): 455-461

LIU You-qiang, CAO Yin-hua, PAN Fei, GAO Jing, QIN Wen-bin, LIU Shi-guang, WANG Zhi-yong. Beam transformation of diode lasers used in laser processing[J]. Editorial Office of Optics and Precision Engineering, 2012,(3): 455-461
刘友强, 曹银花, 潘飞, 高静, 秦文斌, 刘世光, 王智勇. 激光加工用半导体激光器的光束变换[J]. 光学精密工程, 2012,(3): 455-461 DOI： 10.3788/OPE.20122003.0455.

LIU You-qiang, CAO Yin-hua, PAN Fei, GAO Jing, QIN Wen-bin, LIU Shi-guang, WANG Zhi-yong. Beam transformation of diode lasers used in laser processing[J]. Editorial Office of Optics and Precision Engineering, 2012,(3): 455-461 DOI： 10.3788/OPE.20122003.0455.

摘要

考虑不同的激光加工方式对激光功率密度和激光光斑尺寸的要求不同

研究了如何通过调整光路设计实现各种尺寸的聚焦光斑输出

使半导体激光器满足不同激光加工方式的需求。利用ZEMAX光学设计软件模拟半导体激光光路

包括光束整形、准直、聚焦等光束变换方式

实现了多种尺寸的光斑输出。实验中采用16个bar叠加而成的980 nm半导体激光叠阵

阈值电流为6.4 A

最大工作电流为84.8 A

最大输出功率为1 280 W

总的电-光转换效率为58.9%。准直后快轴的发散角小于4 mrad

慢轴的发散角小于20 mrad。通过实验对该激光叠阵进行光束整形和扩束准直、聚焦

最终实现了功率为1 031 W的激光输出

聚焦镜焦距为300 mm时的聚焦光斑尺寸达1.2 mm1.5 mm

功率密度达3.810

W/cm

可以用于金属的表面重熔、合金化、熔覆和热导型焊接。

Abstract

As diode laser processing for different processing technologies demands different power densities and spot sizes

this paper researched how to get focus spot outputs with different sizes by adjusting optical path design to meet the requirements of various laser applications. By using ZEMAX to simulate the diode laser optical path

including beam shaping

collimation

focus

etc.

several kinds of spot outputs with various sizes was implemented. In the experiment

a 980 nm diode laser stack with the superposition of 16 bars was used by a threshold current of 6.4 A

the maximum operating current of 84.8 A

maximum output power of 1 280 W

and the total electrical-optical conversion efficiency of 58.9%. After collimation

the divergence angles for the fast axis and slow axis are less than 4 mrad and 20 mrad

respectively. Finally

the experiments were performed on the diode laser stack by the beam shaping

collimation and focusing

and a power output of 1 031 W is obtained. Furthermore

the focused spot size has been 1.2 mm ? 1.5 mm and the laser power density is up to 3.8?10

W/cm

when the focal length of focusing mirror is 300 nm. Results show that the laser stack can be used in remelting

alloying

cladding and thermal conductivity-type welding for metal surfaces.

关键词

Keywords

references

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