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We report new experimental results to the section-matching Houses of the BaGa4Se7 crystal for harmonic generation of the Nd:YAG laser-pumped AgGaS2 optical parametric oscillator (OPO) in addition to a CO2 laser…
In the latest a long time, new nonlinear optical materials are actually actively designed to make coherent tunable light-weight sources while in the mid-infrared (mid-IR) A part of the spectrum applied in many different…
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A continuous-wave mid-infrared radiation from big difference frequency generation by mixing a continuous-wave Ti: sapphire laser and a continuous-wave YAG laser within a 15 mm prolonged BaGa4Se7 crystal is…
In this particular do the job, Raman spectroscopy, element team Assessment and density functional concept computations ended up applied to review the IR/Raman spectra of the right BGSe crystal and four defect BGSe crystals so that you can explain the structural origin of the residual absorption. The perfect BGSe crystal has seventy two lattice phonons, including a few acoustic phonons (two
β-BaGa4Se7: a promising IR nonlinear optical crystal intended by predictable structural rearrangement†
BaGa4Se7 is usually a promising nonlinear optical crystal at infrared frequencies and displays appealing terahertz phonon-polaritons and significant nonlinear coefficients for terahertz technology. Phonons tend to be the key players in infrared absorptions plus the photon-phonon resonance phenomena at terahertz frequencies. Right here, we analyze the phonon structures of BaGa4Se7 crystal, with polarized Raman spectroscopy and theoretical calculations for phonon dispersion curves, density of states and vibration modes.
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BaGa4Se7’s phonon framework exhibits a comparatively low phonon Vitality cap and a phonon gap. Determine 1a reveals the calculated phonon band dispersions along the significant-symmetry directions of Brillouin zone for BaGa4Se7. The inset offers the definitions of higher-symmetry details in the momentum Area. The blue arrows demonstrate the momentum route corresponding to the dispersion exhibited. The dispersion curves give the maximum phonon Vitality about 300 cm−1 as well as a phonon hole all-around 150 cm−1; the two the very best of phonon bands as well as phonon hole are obvious in Raman spectra (see Fig. three for example) at corresponding Power destinations. We be expecting the BaGa4Se7 crystal is smooth and fragile as the results of this type of minimal phonon Vitality cap. The phonon gap about a hundred and fifty cm−one is about 45 cm−1 large. Determine 1b exhibits the phonon DOS for BaGa4Se7. The pink, inexperienced, and blue shadowed places are for Ba, Ga, Se atom phonon DOS, respectively. The Ba atom only has phonon distribution throughout the lower Power section just under the phonon hole. It implies that the Ba atom doesn’t shift in any way during the phonon modes higher than the gap. For instance, the one hundred eighty.eight and 230.five cm−1 modes exhibit no actions of Ba atoms in Fig. 2. All the upper band phonon modes satisfy the affliction of the even now Ba atom.
′�?, which has a frequency of 295 cm−one, is attributed towards the stretching vibration of Ga–Se bonds. The 2-phonon absorption in the 295 cm−one phonon corresponds towards the crystal IR absorption edge, as an alternative to the residual absorption peak. Density useful idea computations clearly show that the residual absorption with the BGSe crystal originates with the OSe defect (Se is substituted by O).