Highly efficient high-order harmonics with large cutoff from carbon molecules using various laser wavelengths

Carbon molecules are used to generate intense high-order harmonics using driving lasers with 0.8 μm-1.71 μm wavelengths. By driving plasma of reduced size (~200μm) with 1.71μm laser, we could extend the cutoff to ~70eV, while reducing the peak intensity by only ~31%.