XUV Supercontinuum Generated by Incommensurate Two-Color Mid-IR Optical Parametric Amplifier

摘要: High-order harmonic generation is nowadays a topic of crucial interest since it allows the production isolated attosecond pulses. Several efforts have been made so far for extending bursts beyond 100 eV spectral region, in order to access deeper electronic states atoms and molecules. Recently, mid-infrared laser sources demonstrated be ideal candidates pushing high emission up soft X-rays. Here we show that possible obtain continuous spectra, are signature single pulse generation, by properly mixing two pulses, coming from optical parametric amplifiers, with wavelengths 1.35 1.75 μm respectively, either parallel or perpendicular polarizations. Our results demonstrate burst driven pulses duration larger than 30 fs.