Ouzounov D G, Moll K D, Foster M A, Zipfel W R, Webb W W, Gaeta Alexander L
Opt Lett. 2002 Sep 1;27(17):1513-5. doi: 10.1364/ol.27.001513.
We investigate femtosecond-pulse propagation through large-core microstructured fibers. Although these fibers are highly multimode, excitation of the fundamental mode is readily achieved, and coupling to higher-order modes is weak even when the fiber is bent or twisted. For prechirped input pulses with energies as large as 3 nJ, pulses as short as 140 fs were produced at the output of the fiber. Such a system could prove to be extremely useful for applications such as in vivo multiphoton microscopy and endoscopy that require delivery of femtosecond pulses and collection of fluorescence.
我们研究了飞秒脉冲在大芯微结构光纤中的传播。尽管这些光纤是高度多模的，但很容易实现基模的激发，并且即使光纤弯曲或扭曲，与高阶模的耦合也很弱。对于能量高达3 nJ的预啁啾输入脉冲，在光纤输出端产生了短至140 fs的脉冲。这样的系统对于体内多光子显微镜和内窥镜检查等需要传输飞秒脉冲并收集荧光的应用可能非常有用。
