Yue Han, Tingfeng Wang, Dun Gong, Dongbo Che, Ming Wang. Analyzing the Focusing Properties of Mixed Modes in a Step-Index Fiber[J]. Laser & Optoelectronics Progress, 2022, 59(17): 1706002
- Laser & Optoelectronics Progress
- Vol. 59, Issue 17, 1706002 (2022)
Fig. 1. Simplified model of fiber laser passing through focusing system
Fig. 2. Focusing properties varying with fundamental mode ratio when mixed modes are superimposed incoherently. (a) Average power density; (b) focus shift
Fig. 3. Focusing intensity distributions of incoherent superposition of two modes under different fundamental mode ratios. (a)
Fig. 4. Power density of coherent superposition of two modes varying with fundamental mode ratio and phase difference. (a) Fundamental mode ratio; (b) phase difference
Fig. 5. Power density of coherent superposition of three modes varying with fundamental mode ratio and phase difference. (a) Fundamental mode ratio; (b) phase difference
Fig. 6. When the phase difference is
Fig. 7. When the phase difference is different, the focus shift in x direction varying with the fundamental mode ratio. (a) Superposition of two modes; (b) superposition of three modes
Fig. 8. When the fundamental mode ratio is different, the axial focus shift of the mixed modes varying with the phase difference. (a) LP01 mode and LP11 mode; (b) LP01 mode, LP11 mode, and LP02 mode
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