The role of pump incoherence in continuous-wave supercontinuum generation.
The role of pump incoherence in continuous-wave supercontinuum generation.
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DOI：
10.1364/opex.13.006615
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发表时间：
2005-08
期刊：
影响因子：
3.8
通讯作者：
F. Vanholsbeeck;S. Martín-López;M. González-Herráez;S. Coen
中科院分区：
文献类型：
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作者：
F. Vanholsbeeck;S. Martín-López;M. González-Herráez;S. Coen
超连续谱的产生可以在连续波状态下用几瓦的泵浦功率发射到更长的光纤中来实现。以这种方式可以获得高功率谱密度宽带光源。使用广义非线性薛定谔方程模型和考虑泵激光部分相干性质的系综平均程序，我们首次充分解释了这一过程背后的光谱增宽机制。我们的模拟和实验证实，连续波超连续产生涉及拉曼孤子动力学和色散波的方式类似于脉冲超连续。然而，产生的拉曼孤子具有宽的参数分布，因为它们源自与泵浦非相干性相关的随机相位和强度波动。这种孤子分布的平均由实验测量，这解释了显着的平滑实验连续波超连续谱。
Supercontinuum generation can be achieved in the continuous-wave regime with a few watts of pump power launched into kilometer-long fibers. High power spectral density broadband light sources can be obtained in this way. Using a generalized nonlinear Schrödinger equation model and an ensemble averaging procedure that takes into account the partially-coherent nature of the pump laser, we fully explain for the first time the spectral broadening mechanisms underlying this process. Our simulations and experiments confirm that continuous-wave supercontinuum generation involve Raman soliton dynamics and dispersive waves in a way akin to pulsed supercontinua. The Raman solitons are however generated with a wide distribution of parameters because they originate from the random phase and intensity fluctuations associated with the pump incoherence. This soliton distribution is averaged out by experimental measurements, which explains the remarkable smoothness of experimental continuous-wave supercontinuum spectra.