2.5 kW Narrow Linewidth Linearly Polarized All-Fiber MOPA With Cascaded Phase-Modulation to Suppress SBS Induced Self-Pulsing
As a major limitation for power scaling of high power narrow linewidth fiber master oscillator power amplifiers (MOPAs), Stimulated Brillouin Scattering (SBS) induced self-pulsing in polarization maintaining (PM) fiber amplifiers is well characterized and analyzed in this paper by comparing differen...
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IEEE
2020-01-01
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| Series: | IEEE Photonics Journal |
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| Online Access: | https://ieeexplore.ieee.org/document/9102364/ |
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| author | Yanshan Wang Yujun Feng Yi Ma Zhe Chang Wanjing Peng Yinhong Sun Qingsong Gao Rihong Zhu Chun Tang |
| author_facet | Yanshan Wang Yujun Feng Yi Ma Zhe Chang Wanjing Peng Yinhong Sun Qingsong Gao Rihong Zhu Chun Tang |
| author_sort | Yanshan Wang |
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| description | As a major limitation for power scaling of high power narrow linewidth fiber master oscillator power amplifiers (MOPAs), Stimulated Brillouin Scattering (SBS) induced self-pulsing in polarization maintaining (PM) fiber amplifiers is well characterized and analyzed in this paper by comparing different white noise signal (WNS) phase-modulated modes in experiments. It is found that the self-pulsing effect is not observed in the PM-amplifier with single-frequency laser seed injection, and cascaded WNS modulation provides superior self-pulsing suppression than single WNS modulation with similar output linewidth. Moreover, the experimental results indicate that the self-pulsing threshold can hardly be predicted only by the output linewidth or the defined SBS threshold in a WNS phase modulated fiber amplifier system. As self-pulsing is originated from the spectral spikes in WNS modulated system, we theoretically analyzed characteristics of these spikes in different phase-modulation modes. It indicates the spectral peak intensity can be reduced by cascaded modulation, for which self-pulsing can be suppressed. The theoretical predictions agree well with the experimental results. At the same time, in order to suppress the mode instability effect, a plum blossom shaped bending mode selection device is used in this high-power narrow linewidth fiber amplifier system. Finally, a 32 GHz cascaded WNSs modulated, over than 2.5 kW linearly polarized all-fiber amplifier with a slope efficiency of 86.7% is demonstrated. The polarization extinction ratio (PER) is measured larger than 14 dB and the beam quality factor M<sup>2</sup> maintains lower than 1.3 in the power scaling process. |
| format | Article |
| id | doaj-art-1e371aa42f404864a482d01aaba3a3fb |
| institution | Kabale University |
| issn | 1943-0655 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Photonics Journal |
| spelling | doaj-art-1e371aa42f404864a482d01aaba3a3fb2025-08-20T03:33:11ZengIEEEIEEE Photonics Journal1943-06552020-01-0112311510.1109/JPHOT.2020.299793591023642.5 kW Narrow Linewidth Linearly Polarized All-Fiber MOPA With Cascaded Phase-Modulation to Suppress SBS Induced Self-PulsingYanshan Wang0https://orcid.org/0000-0003-1251-4191Yujun Feng1Yi Ma2Zhe Chang3Wanjing Peng4Yinhong Sun5Qingsong Gao6Rihong Zhu7Chun Tang8Institute of Applied Electronics, China Academy of Engineering Physics, Mianyang, ChinaInstitute of Applied Electronics, China Academy of Engineering Physics, Mianyang, ChinaInstitute of Applied Electronics, China Academy of Engineering Physics, Mianyang, ChinaInstitute of Applied Electronics, China Academy of Engineering Physics, Mianyang, ChinaInstitute of Applied Electronics, China Academy of Engineering Physics, Mianyang, ChinaInstitute of Applied Electronics, China Academy of Engineering Physics, Mianyang, ChinaInstitute of Applied Electronics, China Academy of Engineering Physics, Mianyang, ChinaMIIT Key Laboratory of Advanced Solid Laser, Nanjing University of Science and Technology, Nanjing, ChinaInstitute of Applied Electronics, China Academy of Engineering Physics, Mianyang, ChinaAs a major limitation for power scaling of high power narrow linewidth fiber master oscillator power amplifiers (MOPAs), Stimulated Brillouin Scattering (SBS) induced self-pulsing in polarization maintaining (PM) fiber amplifiers is well characterized and analyzed in this paper by comparing different white noise signal (WNS) phase-modulated modes in experiments. It is found that the self-pulsing effect is not observed in the PM-amplifier with single-frequency laser seed injection, and cascaded WNS modulation provides superior self-pulsing suppression than single WNS modulation with similar output linewidth. Moreover, the experimental results indicate that the self-pulsing threshold can hardly be predicted only by the output linewidth or the defined SBS threshold in a WNS phase modulated fiber amplifier system. As self-pulsing is originated from the spectral spikes in WNS modulated system, we theoretically analyzed characteristics of these spikes in different phase-modulation modes. It indicates the spectral peak intensity can be reduced by cascaded modulation, for which self-pulsing can be suppressed. The theoretical predictions agree well with the experimental results. At the same time, in order to suppress the mode instability effect, a plum blossom shaped bending mode selection device is used in this high-power narrow linewidth fiber amplifier system. Finally, a 32 GHz cascaded WNSs modulated, over than 2.5 kW linearly polarized all-fiber amplifier with a slope efficiency of 86.7% is demonstrated. The polarization extinction ratio (PER) is measured larger than 14 dB and the beam quality factor M<sup>2</sup> maintains lower than 1.3 in the power scaling process.https://ieeexplore.ieee.org/document/9102364/High power fiber lasernarrow linewidthlinear polarizationself-pulsing |
| spellingShingle | Yanshan Wang Yujun Feng Yi Ma Zhe Chang Wanjing Peng Yinhong Sun Qingsong Gao Rihong Zhu Chun Tang 2.5 kW Narrow Linewidth Linearly Polarized All-Fiber MOPA With Cascaded Phase-Modulation to Suppress SBS Induced Self-Pulsing IEEE Photonics Journal High power fiber laser narrow linewidth linear polarization self-pulsing |
| title | 2.5 kW Narrow Linewidth Linearly Polarized All-Fiber MOPA With Cascaded Phase-Modulation to Suppress SBS Induced Self-Pulsing |
| title_full | 2.5 kW Narrow Linewidth Linearly Polarized All-Fiber MOPA With Cascaded Phase-Modulation to Suppress SBS Induced Self-Pulsing |
| title_fullStr | 2.5 kW Narrow Linewidth Linearly Polarized All-Fiber MOPA With Cascaded Phase-Modulation to Suppress SBS Induced Self-Pulsing |
| title_full_unstemmed | 2.5 kW Narrow Linewidth Linearly Polarized All-Fiber MOPA With Cascaded Phase-Modulation to Suppress SBS Induced Self-Pulsing |
| title_short | 2.5 kW Narrow Linewidth Linearly Polarized All-Fiber MOPA With Cascaded Phase-Modulation to Suppress SBS Induced Self-Pulsing |
| title_sort | 2 5 kw narrow linewidth linearly polarized all fiber mopa with cascaded phase modulation to suppress sbs induced self pulsing |
| topic | High power fiber laser narrow linewidth linear polarization self-pulsing |
| url | https://ieeexplore.ieee.org/document/9102364/ |
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