Raman-shifted wavelength-selectable pulsed fiber laser with high repetition rate and high pulse energy in the visible.
Raman-shifted wavelength-selectable pulsed fiber laser with high repetition rate and high pulse energy in the visible.
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DOI：
10.1364/oe.25.000351
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发表时间：
2017-01
期刊：
影响因子：
3.8
通讯作者：
L. Xu;S. Alam;Q. Kang;D. Shepherd;D. Richardson
中科院分区：
文献类型：
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作者：
L. Xu;S. Alam;Q. Kang;D. Shepherd;D. Richardson
研究了一种基于掺镱光纤激光器倍频拉曼频移的高脉冲能量、衍射受限、波长可选的可见光光源。拉曼增益和自相位调制的相对长度缩放定律将设计推向具有大芯尺寸的短光纤长度。实验证明，在短光纤长度下，梯度折射率多模光纤中的拉曼净化效应不足以获得衍射极限光束质量。因此，大芯光子晶体光纤被用来保持衍射限制的性能和输出脉冲能量约1 μJ，在1-MHz的重复频率和1.3-ns的脉冲宽度成功地实现。这种步进可调的可见光源应该在光声显微镜中找到应用。
A high-pulse-energy, diffraction-limited, wavelength-selectable, visible source, based on Raman frequency shifting of a frequency-doubled Yb-doped fiber laser, has been studied. The relative length-scaling laws of Raman gain and self-phase modulation push the design towards short fiber lengths with large core size. It is experimentally demonstrated that the Raman clean-up effect in a graded-index multi-mode fiber is not sufficient to obtain diffraction-limited beam quality in the short fiber length. Thus, a large-core photonic crystal fiber is used to maintain diffraction-limited performance and output pulse energies of ~1 μJ, at a 1-MHz repetition rate and 1.3-ns pulse-width are successfully achieved. This step-tunable visible source should find applications in photoacoustic microscopy.