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| 1 | Ultralow-quantum-defect Raman laser based on the boson peak in phosphosilicate fiber显示文摘Quantum defects(QDs)have always been a key factor of the thermal effect in high-power fiber lasers.Much research on low-QD fiber lasers has been reported in the past decades,but most of it is based on active fibers.Besides,Raman fiber lasers based on the stimulated Raman scattering effect in passive fiber are also becoming an important kind of high-power fiber laser for their unique advantages,such as their significantly broader wavelength-tuning range and being free of photon darkening.In this paper,we demonstrate an ultralow-QD Raman fiber laser based on phosphosilicate fiber.There is a strong boson peak located at a frequency shift of 3.65 THz in the Raman gain spectrum of the phosphosilicate fiber we employed.By utilizing this boson peak to provide Raman gain and adopting an amplified spontaneous emission source at 1066 nm as the pump source,1080 nm Stokes light is generated,corresponding to a QD of 1.3%.The spectral purity at 1080 nm can be up to 96.03%,and the output power is 12.5 W,corresponding to a conversion efficiency of 67.2%.Moreover,by increasing the pump wavelength to 1072 nm,the QD is reduced to 0.74%,and the output power at 1080 nm is 10.7 W,with a spectral purity of 82.82%.To the best of our knowledge,this is the lowest QD ever reported for Raman fiber lasers.This work proposes a promising way of achieving high-power,high-efficiency Raman fiber lasers. | Yang Zhang Jiangming Xu Jun Ye Jiaxin Song Tianfu Yao Pu Zhou | 2020 | Photonics Research2020，8，7： | 2 |
| 2 | 5 kW近单模光纤激光振荡器的光子暗化效应显示文摘为研究掺镱光纤(YDF)光子暗化效应对高功率高亮度光纤激光器的影响,利用25/400μm大模场YDF和915 nm半导体泵浦源搭建了光纤激光振荡器,输出功率可达5 kW,输出激光为近单模。对该光纤激光振荡器进行满功率拷机时出现了光子暗化现象,激光器输出功率急剧下降,输出激光时域中呈现出强烈的横向模式不稳定性(TMI)现象。经过多次测试后发现:后向泵浦时该光纤激光振荡器的TMI效应对应的泵浦功率阈值和输出功率阈值均出现一定程度的下降(约为14%),与传统理论相符;前向泵浦时TMI效应对应的泵浦功率阈值和输出功率阈值出现一定程度的上升(约为15%),这与传统理论不相符,需进一步开展研究。最终,该光纤激光振荡器输出功率受到光子暗化效应的影响无法维持在5 kW功率水平。 | 王鹏 杨保来 张汉伟 奚小明 史尘 王小林 许晓军 吕品 | 2022 | 光学学报2022，42，23： | 0 |
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