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β-BaGa4Se7: a promising IR nonlinear optical crystal created by predictable structural rearrangement†
In this particular operate, Raman spectroscopy, variable group Evaluation and density useful principle computations had been utilised to review the IR/Raman spectra of an ideal BGSe crystal and four defect BGSe crystals so that you can explain the structural origin of your residual absorption. The proper BGSe crystal has 72 lattice phonons, such as a few acoustic phonons (two
We report new experimental effects about the stage-matching Qualities of the BaGa4Se7 crystal for harmonic technology of a Nd:YAG laser-pumped AgGaS2 optical parametric oscillator (OPO) along with a CO2 laser…
Theoretical calculations provide the phonon dispersion curves, density of states (DOS) and vibration modes. We figure out nine strongest Raman peaks�?vibration modes and Raman tensors. Our Raman method assignments and phonon calculations clearly show consistencies in phonon energies, phonon kinds, and vibration directions. Earlier mentioned knowledge offers a whole new scenario case in point for phonon gaps, features a complete picture from the phonon constructions of BaGa4Se7, and helps us comprehend its phenomena at infrared and terahertz frequency ranges.
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The deforming vibrations here of Ga–O–Ga bonds in the defect crystal make two IR absorption bands located all around 665 cm−one, equivalent to the crystal residual absorption. The end result will help us to remove the residual absorption and Increase the crystal high quality.
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a Calculated phonon band dispersions together the superior-symmetry Instructions of Brillouin zone for BaGa4Se7. The x axis would be the phonon momentum in K Room, the y axis exhibits the phonon energies in units of wavenumbers.
The BaGa4Se7 (BGSe) crystal is an excellent mid- and much-IR nonlinear optical crystal, but usually shows an unpredicted residual absorption peak close to fifteen μm which substantially deteriorates the crystal general performance. The structural origin of residual absorption remains to be under debate.