Chinese Journal of Lasers, Volume. 52, Issue 18, 1803028(2025)
Development of High‑Performance Lightweight 976 nm Fiber‑Coupled Module (Invited)
Figures & Tables(17)
Fig. 3. Test results of COS device. (a) Output powers and electro-optical conversion efficiencies before and after optimization; (b) slow-axis far-field divergence angles before and after optimization; (c) high-temperature output power and electro-optical conversion efficiency after optimization; (d) high-temperature slow-axis far-field divergence angle after optimization
Fig. 6. Optical path simulation. (a) Slow-axis beam-expanding collimation; (b) comparison of optical path between conventional slow-axis collimation and slow-axis beam-expanding collimation
Fig. 7. Measured output numerical aperture of module for conventional and optimized optical paths
Fig. 8. Beam spot test results. (a) Single-lens coupling; (b) separate fast- and slow-axis coupling
Fig. 9. 976 nm wavelength locking effects. (a) Full current range; (b) wide temperature range
Fig. 11. Physical appearances of lightweight fiber-coupled module. (a) Size; (b) mass
Fig. 12. Test results of fiber-coupled module. (a) Power and electro-optical efficiency; (b) spectrum
Table 1. Main parameters of semiconductor laser chip
View tableTable 1. Main parameters of semiconductor laser chip
Parameter Value Output power /W 25.5 Operating current /A 25 Operating voltage /V 1.55 Electro-optical conversion efficiency /% 68 Fast axis divergence angle /（°） 50 Slow axis divergence angle /（°） 8 Emitter width /μm 190
Table 2. Beam expansion of shaped spot before and after wavelength locking
View tableTable 2. Beam expansion of shaped spot before and after wavelength locking
No. Beam size before wavelength locking /μm Beam size after wavelength locking /μm Beam expansion ratio /% Optimized beam size in slow- axis direction after wavelength locking /μm In fast-axis direction In slow- axis direction In fast-axis direction In slow- axis direction In fast-axis direction In slow- axis direction 1 335 1026 350 1290 4.5 25 1040 2 300 1110 315 1310 5 18 1118 3 330 1135 345 1300 4.5 14.5 1130 4 305 1230 320 1440 5 17 1225
Table 3. Power loss before and after wavelength locking
View tableTable 3. Power loss before and after wavelength locking
No. Before wavelength locking After wavelength locking Power /W Wavelength /nm Power /W Wavelength /nm Full width at half-maximum /nm Transmission efficiency
of VBG /%
1 18.0 972.12 17.1 976.18 0.3 95.0 2 18.1 973.30 17.2 976.18 0.3 95.0 3 18.1 972.48 17.1 976.30 0.4 94.5 4 18.0 972.72 17.0 976.18 0.4 94.5 5 18.1 972.58 17.2 976.30 0.4 95.0 6 17.9 972.86 17.1 976.30 0.3 95.5
Table 4. Harsh environment adaptability test
View tableTable 4. Harsh environment adaptability test
Test Standard Result Mechanical vibration Power shift is <5% Pass Mechanical shock Power shift is <5% Pass Temperature cycling Power shift is <5% Pass High/low temperature storage life Power shift is <5% Pass High/low temperature operation Power shift is <5% Pass Damp heat Power shift is <5% Pass Aging Power shift is <5% Pass
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Baoli Wang, Zhihao Yan, Huabing Qin, Peipei Zhang, Chunming Sun, Peixu Li, Wei Xia, Dehua Wu, Qi Liu, Kang Chen, Zhen Zhu, Shuqiang Li, Xiangang Xu. Development of High‑Performance Lightweight 976 nm Fiber‑Coupled Module (Invited)[J]. Chinese Journal of Lasers, 2025, 52(18): 1803028
Paper Information
Category: Materials
Received: Aug. 6, 2025
Accepted: Sep. 4, 2025
Published Online: Sep. 16, 2025
The Author Email: Zhen Zhu (zhuzhen@inspur.com), Shuqiang Li (lishuqiang@sdu.edu.cn)
CSTR:32183.14.CJL251154
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