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- W2765586294 abstract "We report the coherent excitation of the vibrational state of hydrogen molecules by two-photon absorption and the resultant third-harmonic generation (THG). Parahydrogen molecules cooled by liquid nitrogen are irradiated by mid-infrared nanosecond pulses at 4.8 μm with a nearly Fourier-transform-limited linewidth. The first excited vibrational state of parahydrogen is populated by two-photon absorption of the mid-infrared photons. Because of the narrow linewidth of the mid-infrared pulses, coherence between the ground and excited states is sufficient to induce higher-order processes. Near-infrared photons from the THG are observed at 1.6 μm. The dependence of the intensity of the near-infrared radiation on mid-infrared pulse energy, target pressure, and cell length is determined. We used a simple formula for THG with consideration of realistic experimental conditions to explain the observed results." @default.
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- W2765586294 date "2017-11-29" @default.
- W2765586294 modified "2023-10-14" @default.
- W2765586294 title "Vibrational excitation of hydrogen molecules by two-photon absorption and third-harmonic generation" @default.
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- W2765586294 doi "https://doi.org/10.1088/1361-6455/aa9782" @default.
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