Impact of mode instability on polarization extinction ratio in backward pumped fiber amplifiers
The influence of mode instability (MI) on polarization extinction ratio (PER) has been investigated in a 2 kW level polarization-maintained (PM) fiber laser system with backward pumping configuration, and the phenomena is different from the existing observations in forward-pumped PM fiber amplifiers...
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| Main Authors: | , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Frontiers Media S.A.
2025-07-01
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| Series: | Frontiers in Physics |
| Subjects: | |
| Online Access: | https://www.frontiersin.org/articles/10.3389/fphy.2025.1612074/full |
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| Summary: | The influence of mode instability (MI) on polarization extinction ratio (PER) has been investigated in a 2 kW level polarization-maintained (PM) fiber laser system with backward pumping configuration, and the phenomena is different from the existing observations in forward-pumped PM fiber amplifiers. No decrease in PER was noted with the onset of MI, revealing that the MI effect has little impact on PER in backward-pumped PM fiber amplifiers. The discrepancy induced by the pump configuration has been theoretically analyzed, which is attributed to the longitudinal-distribution difference of high order modes induced by the MI effect. |
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| ISSN: | 2296-424X |