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High performance and higher peak electrical power picosecond mid-infrared optical parametric amplifier depending on BaGa4Se7 crystal.
We report new experimental outcomes over the stage-matching properties of the BaGa4Se7 crystal for harmonic generation of a Nd:YAG laser-pumped AgGaS2 optical parametric oscillator (OPO) along with a CO2 laser…
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On this work, Raman spectroscopy, variable group Investigation and density functional concept computations were being employed to review the IR/Raman spectra of the best BGSe crystal and 4 defect BGSe crystals to be able to make clear the structural origin in the residual absorption. The perfect BGSe crystal has 72 lattice phonons, such as three acoustic phonons (2
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BaGa4Se7 can be a promising nonlinear optical crystal at infrared frequencies and reveals interesting terahertz phonon-polaritons and superior nonlinear coefficients for terahertz era. Phonons are classified as the key gamers in infrared absorptions as well as the photon-phonon resonance phenomena at terahertz frequencies. In this article, we examine the phonon constructions of BaGa4Se7 crystal, with polarized Raman spectroscopy and theoretical calculations for phonon dispersion curves, density of states and vibration modes.
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The BaGa4Se7 (BGSe) crystal is an excellent mid- and far-IR nonlinear optical crystal, but generally reveals an surprising residual absorption peak all around fifteen μm which substantially deteriorates the crystal performance. The structural origin of residual absorption is still under debate.
′�?, with a frequency of 295 cm−1, is attributed into the stretching vibration of Ga–Se bonds. The 2-phonon absorption from the 295 cm−1 phonon corresponds into the crystal IR absorption edge, as an alternative to the residual absorption peak. Density useful principle computations exhibit that the residual absorption in the BGSe crystal originates with the OSe defect (Se is substituted by O).