Dispersive wave generation at 4 μm in a dispersion-engineered fluorotellurite fiber pumped by a 1.98 μm femtosecond fiber laser

We demonstrate dispersive wave generation at 4 pm in a dispersion-engineered fluorotellurite fiber pumped by a 1.98 pm femtosecond fiber laser. All-solid fluorotellurite fibers with a core diameter of similar to 2.6 pm are fabricated by using a rod-in-tube method. The fluorotellurite fibers have two zero-dispersion wavelengths (ZDWs). The first ZDW is 1.328 pm and the second one is 3.551 pm. As the pump laser is launched into the fluorotellurite fiber, firstly, tunable mid-infrared Raman solitons are generated through higher order soliton compression, soliton fission and soliton self-frequency shift. Then, red-shifted dispersive wave at 4 pm is generated as those Raman solitons meet the second ZDW (similar to 3.551 pm) and soliton self-frequency shift cancellation occurs. Our results show that dispersion-engineered fluorotellurite fibers are promising nonlinear media for constructing all-fiber 4 pm light sources

Automated summary

This study demonstrates the generation of dispersive waves at 4 pm using dispersion-engineered fluorotellurite fibers pumped by a femtosecond fiber laser. The fluorotellurite fibers have two zero-dispersion wavelengths and the dispersive wave is generated through a series of processes. The results indicate the potential of dispersion-engineered fluorotellurite fibers for constructing all-fiber 4 pm light sources.