Research of beam combination and focusing system of laser diode applied in ceramic welding
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摘要: 为了解决石油输送管道Al2O3陶瓷内衬管的连接问题，研制了专用的半导体激光光源用于陶瓷激光焊接。实验研究了陶瓷激光焊接所需要的半导体激光工艺参量及光束要求，采用单管空间合束、偏振合束、波长合束以及菲涅耳聚焦系统输出等方式，研制了光场分布均匀的半导体激光陶瓷焊接系统。结果表明，所设计半导体激光器偏振合束输出功率为384W，合束效率达到96.62%，经波长合束后输出功率可以超过800W，聚焦系统输出光斑均匀度为93.85%。该系统可以成功应用于不同场合的陶瓷焊接生产中，满足2mm厚度Al2O3陶瓷激光焊接要求。Abstract: In order to solve the connection problem of Al2O3 ceramic lined pipe in petroleum pipeline, a special semiconductor laser light source was developed for ceramic laser welding. The technological parameters and beam requirements for ceramic laser welding were investigated experimentally. By means of single tube space beam combination, polarization beam combination, wavelength combination and Fresnel focusing system, a semiconductor laser ceramic welding system with uniform light distribution field was developed. The results show that, the output power of the polarization combination module is 384W, the beam combination efficiency is up to 96.62%. After wavelength combination, the output power can exceed 800W, and the output spot uniformity of focusing system is 93.85%. The system can be applied to ceramic welding in different occasions, and meet the requirements of Al2O3 ceramic laser welding with 2mm thickness.
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Figure 2. Cross profiles of different solder widths
a—1.0mm b—1.5mm c—2.0mm d—2.5mm e—3.0mm f—3.5mm
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Figure 5. Schematic of Fresnel lens
a—principle of Fresnel lens b—Fresnel lens with flat base and inward ridge
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Figure 8. Spot profiles of diode laser module on different positions
a—z=0cm b—z=130cm
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Figure 9. Light intensity distribution after polarization combination
a—before adjusting b—after adjusting
Table 1 Output power of polarization combination and the combining efficiency under different drive currents
current of LD1 /A current of LD2 /A output power aftercombination /W loss of power/W combining efficiency/% 1.04 0.98 19.03 0.34 98.24 1.66 1.49 38.19 0.67 98.28 2.91 2.50 77.31 1.37 98.26 4.91 3.57 117.40 2.12 98.23 5.37 4.59 157.10 2.84 98.22 6.64 5.62 195.90 3.66 98.17 8.21 7.43 291.20 7.85 97.37 11.96 11.85 384.10 13.42 96.62 
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