Beckman Laser Institute, University of California, Irvine, Irvine, California 92617, USA.
Opt Lett. 2011 Sep 1;36(17):3362-4. doi: 10.1364/OL.36.003362.
We present a large-core fiber (LCF) with a reduced nonlinear property for a single-mode beam delivery of intense ultrashort pulses. A tapered-fiber mode filter was fabricated in an LCF with the core diameter decreased from 20 μm to 6 μm at the tapered waist region surrounded by index-matched liquid. By the tapered geometry, the high-order mode was rejected so that our mode-filtered LCF acted as a single-mode fiber despite the multimode property of the original LCF. It has been found that this fiber class is suitable for applications, such as an endoscopic multiphoton microscope, that demand a flexible short-distance (<4 m) delivery medium of ultrashort pulses.
我们提出了一种大芯径光纤（LCF），其非线性性能降低，可用于单模强超短脉冲光束传输。通过在 LCF 中制作锥形光纤模式滤波器，将纤芯直径从 20μm 减小到锥形腰部区域的 6μm，该区域被折射率匹配的液体包围。通过锥形几何形状，高阶模式被拒绝，因此我们的模式滤波 LCF 尽管具有原始 LCF 的多模特性，但仍充当单模光纤。已经发现，这种光纤类型适用于需要超短脉冲短距离（<4m）传输介质的应用，例如内窥镜多光子显微镜。
