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Superior effectiveness and large peak energy picosecond mid-infrared optical parametric amplifier based on BaGa4Se7 crystal.
We report new experimental success on the phase-matching Qualities of the BaGa4Se7 crystal for harmonic technology of the Nd:YAG laser-pumped AgGaS2 optical parametric oscillator (OPO) in addition to a CO2 laser…
The deforming vibrations of Ga–O–Ga bonds inside the defect crystal deliver two IR absorption bands Found about 665 cm−one, similar to the crystal residual absorption. The result might help us to reduce the residual absorption and Enhance the crystal quality.
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A steady-wave mid-infrared radiation from big difference frequency generation by mixing a continuous-wave Ti: sapphire laser in addition to a continuous-wave YAG laser inside of a 15 mm lengthy BaGa4Se7 crystal is…
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β-BaGa4Se7: a promising IR nonlinear optical crystal designed by predictable structural rearrangement†
BaGa4Se7 can be a promising nonlinear optical crystal at infrared frequencies and exhibits intriguing terahertz phonon-polaritons and large nonlinear coefficients for terahertz generation. Phonons will be the essential players in infrared absorptions along with the photon-phonon resonance phenomena at terahertz frequencies. Below, we examine the phonon structures of BaGa4Se7 crystal, with polarized Raman spectroscopy and theoretical calculations for phonon dispersion curves, density of states and vibration modes.
Because of the superb detailed overall performance and the significant application price in laser sector, they've got attracted Substantially focus in your house and abroad. The progress of crystal advancement and laser output of BGSe and BGGSe are summarized, and the future advancement is prospected.
BaGa4Se7’s phonon framework exhibits a relatively very low phonon Electrical power cap and also a phonon gap. Determine 1a exhibits the calculated phonon band dispersions alongside the higher-symmetry Instructions of Brillouin zone for BaGa4Se7. The inset provides the definitions of large-symmetry details during the momentum Place. The blue arrows show the momentum route akin to the dispersion displayed. The dispersion curves give the utmost phonon energy about three hundred cm−one along with a phonon hole all-around a hundred and fifty cm−one; the two the very best of phonon bands plus the phonon gap are visible in Raman spectra (see Fig. three for instance) at corresponding Vitality locations. We expect the BaGa4Se7 crystal is soft and fragile as the result of this kind of minimal phonon Strength cap. The phonon gap close to one hundred fifty cm−1 is about 45 cm−1 huge. Determine 1b demonstrates the phonon DOS for BaGa4Se7. The pink, environmentally friendly, and blue shadowed regions are for Ba, Ga, Se atom phonon DOS, respectively. The Ba atom only has phonon distribution within the lower Strength element just under the phonon gap. It signifies that the Ba atom doesn’t shift in the slightest degree while in the more info phonon modes higher than the hole. For illustration, the 180.eight and 230.five cm−one modes clearly show no movements of Ba atoms in Fig. 2. Most of the upper band phonon modes satisfy the situation of the nonetheless Ba atom.
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