Redding Brandon, Ahmadi Peyman, Mokan Vadim, Seifert Martin, Choma Michael A, Cao Hui
Opt Lett. 2015 Oct 15;40(20):4607-10. doi: 10.1364/OL.40.004607.
We design and demonstrate a fiber-based amplified spontaneous emission (ASE) source with low spatial coherence, low temporal coherence, and high power per mode. ASE is produced by optically pumping a large gain core multimode fiber while minimizing optical feedback to avoid lasing. The fiber ASE source provides 270 mW of continuous wave emission, centered at λ=1055 nm, with a full width at half-maximum bandwidth of 74 nm. The emission is distributed among as many as ∼70 spatial modes, enabling efficient speckle suppression when combined with spectral compounding. Finally, we demonstrate speckle-free full-field imaging using the fiber ASE source. The fiber ASE source provides a unique combination of high power per mode with both low spatial and low temporal coherence, making it an ideal source for full-field imaging and ranging applications.
我们设计并展示了一种基于光纤的放大自发辐射（ASE）源，它具有低空间相干性、低时间相干性以及高单模功率。ASE是通过对大增益芯多模光纤进行光泵浦产生的，同时尽量减少光反馈以避免激光振荡。该光纤ASE源提供270 mW的连续波发射，中心波长为λ = 1055 nm，半高全宽带宽为74 nm。发射光分布在多达约70个空间模式中，与光谱复合相结合时能够有效抑制散斑。最后，我们展示了使用该光纤ASE源进行的无散斑全场成像。该光纤ASE源兼具高单模功率以及低空间和低时间相干性的独特组合，使其成为全场成像和测距应用的理想光源。
