ИСТИНА

In our experiments, ultrashort mid-IR pulses were used to drive supercontinuum generation in a gas-filled SR HC PCF. The antiresonance-guiding ring structure in this fiber is designed in such a way as to support soliton selfcompression of the mid-IR driver to pulse widths well below the field cycle. A solitonic transformation of a 3.2-μm, sub-200-fs output of a multistage optical parametric amplifier in such a fiber yields multioctave supercontinua spanning from 0.3 to 5.2 μm. The spectra of the hollow-core PCF output were measured as a function of the input energy of the mid-IR driver W0 (up to 50 μJ) and argon pressure p (varied from 1 to 16 bar), within a spectral range of several octaves, from the UV to the mid-IR, to confirm the prediction power of our numerical model and analyze the temporal evolution of mid-IR pulses.