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Significant efficiency and large peak power picosecond mid-infrared optical parametric amplifier according to BaGa4Se7 crystal.
We report new experimental outcomes over the period-matching Houses of the BaGa4Se7 crystal for harmonic generation of the Nd:YAG laser-pumped AgGaS2 optical parametric oscillator (OPO) and also a CO2 laser…
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Like a promising nonlinear optical crystal within the infrared region, BaGa4Se7 also exhibits phonon strongly similar polariton dynamics with terahertz waves and substantial nonlinear coefficients for terahertz generation because of phonon resonances. Within this get the job done, we analyzed the phonon structures of BaGa4Se7 crystal, with both equally polarized Raman spectroscopy and theoretical calculations. Theoretical calculations existing the phonon dispersion curves, DOS, and vibration modes. Our Raman manner assignments and phonon calculations exhibit consistencies in phonon energies, phonon sorts, and vibration directions. We also stated nine strongest Raman peaks�?vibration method pics and Raman tensors.
A constant-wave mid-infrared radiation from change frequency generation by mixing a steady-wave Ti: sapphire laser as well as a steady-wave YAG laser in a very fifteen mm long BaGa4Se7 crystal is…
In this function, Raman spectroscopy, issue group Examination and density functional theory computations were made use of to review the IR/Raman spectra of an ideal BGSe crystal and four defect BGSe crystals to be able to explain the structural origin with the residual absorption. The right BGSe crystal has 72 lattice phonons, including a few acoustic phonons (2
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The BaGa4Se7 (BGSe) crystal is an excellent mid- and more info much-IR nonlinear optical crystal, but often exhibits an unforeseen residual absorption peak all around 15 μm which significantly deteriorates the crystal performance. The structural origin of residual absorption is still below discussion.
′�?, using a frequency of 295 cm−1, is attributed to the stretching vibration of Ga–Se bonds. The 2-phonon absorption on the 295 cm−1 phonon corresponds to the crystal IR absorption edge, as opposed to the residual absorption peak. Density useful concept computations present the residual absorption of your BGSe crystal originates in the OSe defect (Se is substituted by O).