Cladding-pumped Raman fiber amplifier
Cladding-pumped Raman fiber amplifier
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DOI：
10.1364/oaa.2002.pd2
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发表时间：
2002-07
期刊：
影响因子：
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通讯作者：
J. Nilsson;J. Sahu;J. Jang;R. Selvas;A. Grudinin
中科院分区：
文献类型：
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作者：
J. Nilsson;J. Sahu;J. Jang;R. Selvas;A. Grudinin
包层泵浦稀土掺杂光纤和拉曼光纤器件是近年来高功率光纤放大器和激光器领域最引人注目的两项进展。包层泵浦可以用多模泵浦源进行泵浦，以低成本提供高功率。双包层光纤的纤芯仍然可以是单模，从而可以实现单模放大或激射。拉曼增益需要高泵浦功率，因此拉曼转换仅在高功率水平下才有效。在另一个波段，拉曼器件非常灵活，因为使用正确的泵浦源可以在任意波长下获得增益。包层泵浦拉曼光纤器件代表了多模泵浦和拉曼光纤器件的自然发展。虽然包层泵浦拉曼光纤器件需要 100W 的泵浦功率，但这种功率可以从光纤源以及传统的散装源获得。例如，最近报道了一种输出功率为1kW的多模掺钕光纤激光器。然而，对于脉冲源，可以用相对适中的平均功率来实现所需的峰值功率。在这里，我们首次报告了包层泵浦光纤中的拉曼放大，没有任何稀土掺杂。我们相信，这是朝着基于多模泵浦亮度增强非线性转换的全类新型光放大器器件迈出的重要一步，不仅包括拉曼转换器，还包括布里渊转换器和光参量转换器。
Cladding-pumped rare-earth-doped fibers and Raman fiber devices have been two of the most compelling advances in the area of high-power fiber amplifiers and lasers in recent years. Cladding-pumping enables pumping with multi-mode pump sources that deliver high-power at a low cost The core of the double-clad fiber can still be single-moded, so that single-mode amplification or lasing can be realized. Raman gain requires high pump powers and Raman conversion is therefore only efficient at high power levels. On the other band, Raman devices are very flexible as gain is available at arbitrary wavelengths with the right pump source. Cladding-pumped Raman fiber devices represent a natural progression to multi-mode pumping and Raman fiber devices. While cladding-pumped Raman fiber devices require pump powers of, say, 100 W, such powers are available from fiber sources as well as from traditional bulk sources. For example, a multimode Nd-doped fiber laser with 1 kW of output power was recently reported. With pulsed sources, however, the required peak powers can be achieved with relatively modest average powers. Here, we report for the first time Raman amplification in a cladding-pumped fiber, without any rare-earth doping. We believe that this is an important step towards a whole class of new optical amplifier devices based on brightness-enhancing nonlinear conversion of multimode pumps, including not only Raman converters but also Brillouin and optical parametric converters.