Experimental Study of 5-kW High-Stability Monolithic Fiber Laser Oscillator With or Without External Feedback
In this paper, we construct a high power monolithic fiber laser oscillator based on a commercial ytterbium-doped fiber with core/inner cladding diameter of 25/400 <italic>μ</italic>m. The output performances of the fiber oscillator are experime...
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IEEE
2019-01-01
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| Series: | IEEE Photonics Journal |
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| Online Access: | https://ieeexplore.ieee.org/document/8741063/ |
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| author | Yun Ye Xiaoming Xi Chen Shi Hanwei Zhang Baolai Yang Xiaolin Wang Pu Zhou Xiaojun Xu |
| author_facet | Yun Ye Xiaoming Xi Chen Shi Hanwei Zhang Baolai Yang Xiaolin Wang Pu Zhou Xiaojun Xu |
| author_sort | Yun Ye |
| collection | DOAJ |
| description | In this paper, we construct a high power monolithic fiber laser oscillator based on a commercial ytterbium-doped fiber with core/inner cladding diameter of 25/400 <italic>μ</italic>m. The output performances of the fiber oscillator are experimentally investigated in the conditions of either with or without an external feedback. In the presence of external feedback, a very strong stimulated Raman scattering (SRS) (∼9 dB below the signal light) emerges at the output power of ∼3.56 kW, where the onset of the transverse mode instability (TMI) limits further power scaling. By large angle cleaving the signal arm of the forward combiner to avoid external feedback, the maximum output power of 5.07 kW is achieved with no sign of TMI. The Raman stokes light is ∼35 dB below the signal light and the M<sup>2</sup> factor is measured to be ∼1.6. To directly characterize its power stability and engineering capability, the fiber oscillator is tested for continuous 5-h operation at ∼5.07 kW with power fluctuation less than 0.42%. During the test process, the output power, spectrum, beam quality, and temporal signal perform excellent stability. The experimental results reveal that thresholds of SRS and TMI strongly depend on the external feedback in high power fiber oscillators. |
| format | Article |
| id | doaj-art-ac36a5387a7e456d99bd234fa1b58d90 |
| institution | DOAJ |
| issn | 1943-0655 |
| language | English |
| publishDate | 2019-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Photonics Journal |
| spelling | doaj-art-ac36a5387a7e456d99bd234fa1b58d902025-08-20T02:41:55ZengIEEEIEEE Photonics Journal1943-06552019-01-011141810.1109/JPHOT.2019.29237098741063Experimental Study of 5-kW High-Stability Monolithic Fiber Laser Oscillator With or Without External FeedbackYun Ye0https://orcid.org/0000-0003-0100-2342Xiaoming Xi1Chen Shi2https://orcid.org/0000-0002-7045-330XHanwei Zhang3https://orcid.org/0000-0001-9880-811XBaolai Yang4https://orcid.org/0000-0003-4158-3882Xiaolin Wang5Pu Zhou6https://orcid.org/0000-0003-2382-5489Xiaojun Xu7College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, ChinaCollege of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, ChinaCollege of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, ChinaCollege of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, ChinaCollege of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, ChinaCollege of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, ChinaCollege of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, ChinaCollege of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, ChinaIn this paper, we construct a high power monolithic fiber laser oscillator based on a commercial ytterbium-doped fiber with core/inner cladding diameter of 25/400 <italic>μ</italic>m. The output performances of the fiber oscillator are experimentally investigated in the conditions of either with or without an external feedback. In the presence of external feedback, a very strong stimulated Raman scattering (SRS) (∼9 dB below the signal light) emerges at the output power of ∼3.56 kW, where the onset of the transverse mode instability (TMI) limits further power scaling. By large angle cleaving the signal arm of the forward combiner to avoid external feedback, the maximum output power of 5.07 kW is achieved with no sign of TMI. The Raman stokes light is ∼35 dB below the signal light and the M<sup>2</sup> factor is measured to be ∼1.6. To directly characterize its power stability and engineering capability, the fiber oscillator is tested for continuous 5-h operation at ∼5.07 kW with power fluctuation less than 0.42%. During the test process, the output power, spectrum, beam quality, and temporal signal perform excellent stability. The experimental results reveal that thresholds of SRS and TMI strongly depend on the external feedback in high power fiber oscillators.https://ieeexplore.ieee.org/document/8741063/Fiber laserslaser oscillatorsstimulated Raman scatteringtransverse mode instabilityexternal feedback |
| spellingShingle | Yun Ye Xiaoming Xi Chen Shi Hanwei Zhang Baolai Yang Xiaolin Wang Pu Zhou Xiaojun Xu Experimental Study of 5-kW High-Stability Monolithic Fiber Laser Oscillator With or Without External Feedback IEEE Photonics Journal Fiber lasers laser oscillators stimulated Raman scattering transverse mode instability external feedback |
| title | Experimental Study of 5-kW High-Stability Monolithic Fiber Laser Oscillator With or Without External Feedback |
| title_full | Experimental Study of 5-kW High-Stability Monolithic Fiber Laser Oscillator With or Without External Feedback |
| title_fullStr | Experimental Study of 5-kW High-Stability Monolithic Fiber Laser Oscillator With or Without External Feedback |
| title_full_unstemmed | Experimental Study of 5-kW High-Stability Monolithic Fiber Laser Oscillator With or Without External Feedback |
| title_short | Experimental Study of 5-kW High-Stability Monolithic Fiber Laser Oscillator With or Without External Feedback |
| title_sort | experimental study of 5 kw high stability monolithic fiber laser oscillator with or without external feedback |
| topic | Fiber lasers laser oscillators stimulated Raman scattering transverse mode instability external feedback |
| url | https://ieeexplore.ieee.org/document/8741063/ |
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