van Howe James, Lee Jennifer H, Zhou Shian, Wise Frank, Xu Chris, Ramachandran Siddharth, Ghalmi Samir, Yan Man F
School of Applied and Engineering Physics, Cornell University, Ithaca, NY 14853, USA.
Opt Lett. 2007 Feb 15;32(4):340-2. doi: 10.1364/ol.32.000340.
We demonstrate soliton self-frequency shift of more than 12% of the optical frequency in a higher-order mode solid, silica-based fiber below 1300nm. This new class of fiber shows great promise for supporting Raman-shifted solitons below 1300nm in intermediate energy regimes of 1 to 10nJ that cannot be reached by index-guided photonic crystal fibers or air-core photonic bandgap fibers. By changing the input pulse energy of 200fs pulses from 1.36 to 1.63nJ we observe Raman-shifted solitons between 1064 and 1200nm with up to 57% power conversion efficiency and compressed output pulse widths less than 50fs. Furthermore, due to the dispersion characteristics of the HOM fiber, we observe redshifted Cerenkov radiation in the normal dispersion regime for appropriately energetic input pulses.
我们展示了在低于1300nm的高阶模式固体石英基光纤中，光频率的孤子自频移超过12%。这种新型光纤在1至10nJ的中等能量范围内，对于支持低于1300nm的拉曼频移孤子显示出巨大潜力，而这是折射率引导光子晶体光纤或空芯光子带隙光纤无法实现的。通过将200fs脉冲的输入脉冲能量从1.36nJ改变到1.63nJ，我们观察到在1064至1200nm之间的拉曼频移孤子，其功率转换效率高达57%，压缩后的输出脉冲宽度小于50fs。此外，由于高阶模式光纤的色散特性，对于能量适当的输入脉冲，我们在正常色散区域观察到了红移的切伦科夫辐射。
