High-order harmonic generation during different overlaps of two-colored pulses in laser-produced plasmas and gasesстатья
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Дата последнего поиска статьи во внешних источниках: 11 ноября 2020 г.
Аннотация:In high-order harmonic generation in low-dense media, the application of two-colored pumphas been shown to enhance odd-order harmonics, as well as the generation of strong even harmonics.Here, we apply this approach to compare high-order harmonic generation from laser-produced plasmasand gases using different mechanisms of harmonic emission enhancement. We generate two-color pump(TCP, 806 nm + 403 nm and 1030 nm + 515 nm) using two nonlinear crystals of different thickness (0.2 and0.4 mm in the case of experiments with plasmas using 806 nm pump; and 0.1 mm and 0.4 mm in the caseof experiments with gases and plasmas using 1030 nm pump) to demonstrate the enhancement of odd andeven harmonics in laser-produced plasmas and by applying weak second field (403 or 515 nm) at differentoverlaps of pump pulses. The high-order harmonic generation in two media using TCP pulses is optimized.We demonstrate the wavelength dependence and the prevailing role of the partial overlap between the twoorthogonally polarized waves in laser-produced plasmas and gases over large ratios of the second-orderand fundamental photons. Our results are supported by the non-perturbative single atom theory and theinterference model simulations.