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Ultra-low quantum defect Raman laser based on boson peak in phosphosilicate fiber
Photonics Research ( IF 7.6 ) Pub Date : 2020-06-16 , DOI: 10.1364/prj.390950
Yang Zhang , Jiangming Xu , Jun Ye , Jiaxin Song , Tianfu Yao , Pu Zhou

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.

中文翻译:

基于磷硅酸盐光纤玻色子峰的超低量子缺陷拉曼激光器

量子缺陷 (QD) 一直是高功率光纤激光器热效应的关键因素。在过去的几十年里,关于低 QD 光纤激光器的研究很多,但大部分都是基于有源光纤。此外,基于无源光纤中受激拉曼散射效应的拉曼光纤激光器也以其独特的优势,如显着更宽的波长调谐范围和无光子暗化,成为一种重要的高功率光纤激光器。在本文中,我们展示了一种基于磷硅酸盐光纤的超低 QD 拉曼光纤激光器。在我们采用的磷硅酸盐纤维的拉曼增益光谱中,有一个位于 3.65 THz 频移处的强玻色子峰。利用这个玻色子峰提供拉曼增益,并采用放大的 1066 nm 自发发射源作为泵浦源,产生 1080 nm 斯托克斯光,对应于 1.3% 的 QD。1080nm光谱纯度可达96.03%,输出功率12.5W,对应转换效率67.2%。此外,通过将泵浦波长增加到 1072 nm,QD 降低到 0.74%,1080 nm 处的输出功率为 10.7 W,光谱纯度为 82.82%。据我们所知,这是拉曼光纤激光器有史以来报告的最低 QD。这项工作提出了一种实现高功率、高效率拉曼光纤激光器的有前途的方法。对应的转换效率为 67.2%。此外,通过将泵浦波长增加到 1072 nm,QD 降低到 0.74%,1080 nm 处的输出功率为 10.7 W,光谱纯度为 82.82%。据我们所知,这是拉曼光纤激光器有史以来报告的最低 QD。这项工作提出了一种实现高功率、高效率拉曼光纤激光器的有前途的方法。对应的转换效率为 67.2%。此外,通过将泵浦波长增加到 1072 nm,QD 降低到 0.74%,1080 nm 处的输出功率为 10.7 W,光谱纯度为 82.82%。据我们所知,这是拉曼光纤激光器有史以来报告的最低 QD。这项工作提出了一种实现高功率、高效率拉曼光纤激光器的有前途的方法。
更新日期:2020-06-16
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