Hansinger, P; Maleshkov, Georgi; Garanovich, Ivan; Skryabin, D; Neshev, Dragomir; Kivshar, Yuri; Dreischuh, Alexander; Paulus, GG
Optical vortices (OVs) are singular optical beams with a spiral phase dislocation in their wavefront. When two pump beams at the frequencies1 and2 interact in a Kerr-type nonlinear medium, the degenerate four-wave mixing (FWM) process results in the generation of new distinct sum and difference frequency components at the output. Importantly, the FWM process is expected to preserve the topological charge of the OVs, and thus it can be employed for the generation of white-light vortices, in...[Show more]
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