Research on air tightness of image intensifier tube during laser sealing

Yang LI; Yufeng ZHU; Yueying LAI; Jinjuan DU; Ziheng HAO; Zhifeng XU; Haoyu WU; Linyu GAN; Peng CHEN

doi:10.5768/JAO202243.0604022

Journal of Applied Optics, Volume. 43, Issue 6, 1202(2022)

Research on air tightness of image intensifier tube during laser sealing

Yang LI1...2, Yufeng ZHU1,2,*, Yueying LAI1,2, Jinjuan DU1,2, Ziheng HAO1,2, Zhifeng XU1,2, Haoyu WU1,2, Linyu GAN1,2, and Peng CHEN12 |Show fewer author(s)

Author Affiliations

¹Science and Technology on Low-Light-Level Night Vision Laboratory, Xi'an 710065, China

²Kunming Institute of Physics, Kunming 650223, China

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Figures & Tables(11)

Fig. 1. Microstructure morphology of same laser power (225 W) and different pulse widths

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Fig. 2. Microstructure morphology of same pulse width (1.7 ms) and different power

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Fig. 3. Metallographic structure morphology of same pulse width (1.7 ms) and different power

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Fig. 4. Metallographic structure morphology of same power (225 W) and different pulse widths

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Fig. 5. Microhardness distribution of welded joints

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Fig. 6. Forming model of welded joint

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Table 1. Chemical composition of 4J34 kovar alloy
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Table 1. Chemical composition of 4J34 kovar alloy
C P S Mn Si Ni Co Fe
不大于（≤）
0.05 0.02 0.02 0.5 0.3 28.5~29.5 19.5-20.5 均衡

Table 2. Chemical composition of 4J49 kovar alloy
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Table 2. Chemical composition of 4J49 kovar alloy
C P S Mn Si B Ni Cr Fe
不大于（≤）
0.05 0.02 0.02 0.5 0.3 0.02 46.0~48.0 5.00-6.00 均衡

Table 3. Main technical parameters of WF300 laser welding machine
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Table 3. Main technical parameters of WF300 laser welding machine
最大激光功率/W 最大激光脉冲能量/J 最大脉宽/ms 最大频率/Hz
300 80 20 500

Table 4. Test factor level
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Table 4. Test factor level
水平因素代号
A脉冲宽度/ms B激光功率/W
1 1.2 195（65%）
2 1.7 210（70%）
3 2.2 225（75%）

Table 5. Air tightness of welded joints

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Table 5. Air tightness of welded joints

脉宽/ms	激光功率/W
脉宽/ms	195	210	225
1.2	未焊上（37 J）	未焊上（39 J）	1.0×10⁻¹³mbar·l/s（39 J）
1.7	1.0×10⁻¹³mbar·l/s（41 J）	1.0×10⁻¹³mbar·l/s（42 J）	1.0×10⁻¹³mbar·l/s（43 J）
2.2	1.0×10⁻¹³ mbar·l/s（46 J）	漏气（48 J）	1.0×10⁻¹³ mbar·l/s（48 J）

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Yang LI, Yufeng ZHU, Yueying LAI, Jinjuan DU, Ziheng HAO, Zhifeng XU, Haoyu WU, Linyu GAN, Peng CHEN. Research on air tightness of image intensifier tube during laser sealing[J]. Journal of Applied Optics, 2022, 43(6): 1202

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