Zeyuan Fang, Lu Yin, Mingjian Yan, Zhigang Han, Hua Shen, Rihong Zhu. Study on signal light transmission efficiency enhancement of backward pump-signal combiners in high-power fiber lasers[J]. Infrared and Laser Engineering, 2020, 49(10): 20200014
- Infrared and Laser Engineering
- Vol. 49, Issue 10, 20200014 (2020)
Fig. 1. Output signal fiber of the backward combiner
Fig. 2. Schematic diagram of the backward BPSC
Fig. 3. Schematic diagram of the end face of the two fibers
Fig. 4. Schematic diagram of the LP11 mode coupling efficiency
Fig. 5. Concentration of energy distribution in the core (a) for the LP01 mode, (b) for the LP11 mode
Fig. 6. Relationship between core diameter mismatch and transmission efficiency
Fig. 7. Testing system of the backward combiner
Fig. 8. (a) 0.065NA 20/400 backward combiner, (b) 0.065NA 25/400 backward combiner
Fig. 9. Signal transmission efficiency of the 0.11NA 25/400 backward combiner
Fig. 10. Infrared thermal images of two (6+1)×1 BPSCs
Fig. 11. Beam quality testing system for backward combiners
Fig. 12. Beam quality of the oscillator in the test system
Fig. 13. (a) Beam quality of test A, (b) beam quality of test B
Fig. 14. Output power of the 3 kW MOPA
Fig. 15. Beam quality of the MOPA
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Table 1. Energy distribution parameters of partial LP modes in double-clad fibers
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