The 8th EPS-QEOD EUROPHOTON Conference"Solid State, Fibre, and Waveguide Coherent Light Sources" was held in Barcelona, Spain, between 02 - 07 September 2018
The PI Grzegorz Soboń presented a poster entitled: "Coherence properties of frequency-shifted solitons generated in highly nonlinear fibers", co-authored by T. Martynkien, K. Tarnowski, P. Mergo, A. Foltynowicz, and J. Sotor.
The nonlinear fibers for soliton-self frequency shift are crucial components of the fiber-based mid-infrared frequency combs developed in the frame of our Project. They allow to convert the wavelength of the pump pulses (e.g. 1560 nm) towards longer wavelengths (e.g. 1950 nm). Afterwards, both beams can be mixed together in a difference frequency generation process, resulting in tunable mid-infrared comb. However, the main question was: are the shifted solitons coherent? The answer is: yes! Our investigation shows that the frequency shift occuring in our nonlinear fibers is a highly coherent process.