Abstract
Third- and fifth-harmonic generation by ultrashort laser pulses in the mid-infrared reveals nonlinear-optical effects beyond the fifth-order nonlinearity and enables, due to an extraordinarily long coherence length, efficient multiplex frequency upconversion of ultrashort mid-IR pulses.
Highlights
We experimentally demonstrate and theoretically analyze third- and fifth-harmonic generation by 80-fs pulses of 3.9-μm radiation with a peak power up to 0.15 TW in the regime of collimated beams
While high-order harmonic generation in the strong-field regime enables the synthesis of unprecedentedly short field waveforms, low-order harmonics are used for nonperturbing measurements on atomic and molecular systems, giving an access to the key parameters of materials, including their optical susceptibilities
The latest breakthroughs in the development of mid-IR sources capable of delivering sub-100-fs pulses with wavelengths well beyond 3 mm [5] open unique possibilities for in-depth studies of optical nonlinearities in the mid-IR, allowing low-order optical harmonics to be generated in the regime of weak dispersion and, extraordinarily large interaction lengths
Summary
We experimentally demonstrate and theoretically analyze third- and fifth-harmonic generation by 80-fs pulses of 3.9-μm radiation with a peak power up to 0.15 TW in the regime of collimated beams. While high-order harmonic generation in the strong-field regime enables the synthesis of unprecedentedly short field waveforms, low-order harmonics are used for nonperturbing measurements on atomic and molecular systems, giving an access to the key parameters of materials, including their optical susceptibilities.
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