COMSOL Simulation of Temperature Field of CO<sub>2</sub> Laser Annealing Ge Core Fiber

Shaoye Wang; Jianbo Zhang; Ziwen Zhao; Yifan Du; Shuangqi Zhong

doi:10.3788/LOP221828

Laser & Optoelectronics Progress, Volume. 60, Issue 15, 1506005(2023)

COMSOL Simulation of Temperature Field of CO₂ Laser Annealing Ge Core Fiber

Shaoye Wang^1,2,3, Jianbo Zhang^1,2,3, Ziwen Zhao^1,2,3、*, Yifan Du^1,2,3, and Shuangqi Zhong^1,2,3

Author Affiliations

¹Key Laboratory of Specialty Fiber Optics and Optical Access Networks, Shanghai University, Shanghai 200444, China

²Joint International Research Laboratory of Specialty Fiber Optics and Advanced; Communication, Shanghai University, Shanghai 200444, China

³Shanghai Institute for Advanced Communication and Data Science, Shanghai University, Shanghai 200444, China

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Figures & Tables(12)

Fig. 1. Annealing device. (a) CO₂ laser device diagram; (b) laser beam

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Fig. 2. Schematic diagram of laser annealing Ge core fiber

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Fig. 3. Ge core fiber. (a) Cross-section of Ge core fiber; (b) side view of Ge core fiber

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Fig. 4. Temperature change curve of axial center point. (a) v = 6 mm/s; (b) v = 9 mm/s; (c) v = 12 mm/s; (d) v = 15 mm/s; (e) v = 18 mm/s; (f) v = 21 mm/s

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Fig. 5. Radial temperature field distribution of the Ge core fiber at z = 2.25 cm

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Fig. 6. Temperature field distribution at the center point of the two ends of the fiber axis. (a) v = 15 mm/s, P = 4.305 W; (b) v = 18 mm/s, P =5.381 W

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Fig. 7. Fitting diagram of fiber axial and radial temperature difference

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Fig. 8. Raman spectrum. (a) Comparison of Raman peak frequency; (b) line chart of Raman peak

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Table 1. Statistics of the maximum temperature at the center point

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Table 1. Statistics of the maximum temperature at the center point

v /（mm·s^-1）	Maximum temperature /K
v /（mm·s^-1）	P =1.076 W	P =2.153 W	P =3.229 W	P =4.305 W	P =5.381 W
6	862	1204	1420	1572	1696
9	730	1002	1253	1456	1617
12	638	915	1144	1344	1513
15	575	819	1016	1204	1381
18	530	747	948	1131	1290
21	498	684	870	1036	1193

Table 2. Radial temperature difference at different annealing conditions
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Table 2. Radial temperature difference at different annealing conditions
v /（mm·s^-1） 6 9 12 15 18 18 21
P /W 2.153 3.229 3.229 4.305 4.305 5.381 5.381
T_diff/K 24 50 37 50 17 21 21

Table 3. Statistics of maximum temperature at the center point of both ends of the fiber axis
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Table 3. Statistics of maximum temperature at the center point of both ends of the fiber axis
v /（mm·s^-1） 6 9 12 15 18 18 21
P /W 2.153 3.229 3.229 4.305 4.305 5.381 5.381
Tz₀ /K 995 1068 946 990 910 1022 949
Tz_4.5 /K 1433 1514 1392 1391 1376 1569 1435
T_diff /K 438 446 446 401 466 547 486

Table 4. Normalized axial and radial temperature difference
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Table 4. Normalized axial and radial temperature difference
v/（mm·s^-1） 6 9 12 15 18 18 21
P /W 2.153 3.229 3.229 4.305 4.305 5.381 5.381
$T_{d i f f}^{*}$ in radial /K 0.212 1.000 0.606 1.000 0.000 0.121 0.121
$T_{d i f f}^{*}$ in axis /K 0.253 0.308 0.308 0.000 0.445 1.000 0.582

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Shaoye Wang, Jianbo Zhang, Ziwen Zhao, Yifan Du, Shuangqi Zhong. COMSOL Simulation of Temperature Field of CO₂ Laser Annealing Ge Core Fiber[J]. Laser & Optoelectronics Progress, 2023, 60(15): 1506005

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