BaGa4Se7 Crystal - An Overview
BaGa4Se7 Crystal - An Overview
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Higher efficiency and high peak electrical power picosecond mid-infrared optical parametric amplifier depending on BaGa4Se7 crystal.
We report new experimental benefits over the stage-matching properties of the BaGa4Se7 crystal for harmonic generation of a Nd:YAG laser-pumped AgGaS2 optical parametric oscillator (OPO) in addition to a CO2 laser…
In current many years, new nonlinear optical resources happen to be actively formulated to produce coherent tunable light-weight sources during the mid-infrared (mid-IR) Section of the spectrum employed in many different…
For a promising nonlinear optical crystal inside the infrared area, BaGa4Se7 also shows phonon strongly relevant polariton dynamics with terahertz waves and high nonlinear coefficients for terahertz generation as a consequence of phonon resonances. On this perform, we analyzed the phonon constructions of BaGa4Se7 crystal, with both polarized Raman spectroscopy and theoretical calculations. Theoretical calculations current the phonon dispersion curves, DOS, and vibration modes. Our Raman mode assignments and phonon calculations show consistencies in phonon energies, phonon varieties, and vibration directions. We also detailed 9 strongest Raman peaks�?vibration method pics and Raman tensors.
A constant-wave mid-infrared radiation from big difference frequency generation by mixing a constant-wave Ti: sapphire laser plus a continuous-wave YAG laser in a very 15 mm extensive BaGa4Se7 crystal is…
Within this get the job done, Raman spectroscopy, factor team Assessment and density useful concept computations ended up utilized to review the IR/Raman spectra of the ideal BGSe crystal and four defect BGSe crystals as a way to explain the structural origin with the residual absorption. The right BGSe crystal has 72 lattice phonons, which includes a few acoustic phonons (two
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BaGa4Se7 can be a promising nonlinear optical crystal at infrared frequencies and exhibits appealing terahertz phonon-polaritons and superior nonlinear coefficients for terahertz generation. Phonons are definitely the essential gamers in infrared absorptions as well as photon-phonon resonance phenomena at terahertz frequencies. Right here, we examine the phonon buildings of BaGa4Se7 crystal, with polarized Raman spectroscopy and theoretical calculations for phonon dispersion curves, density of states and vibration modes.
Due to excellent thorough performance as well as the significant software price in laser field, they may have captivated Considerably awareness in your own home and overseas. The development of crystal advancement and laser output of BGSe and BGGSe are summarized, and the long run advancement is prospected.
The BaGa4Se7 (BGSe) crystal is a superb mid- and far-IR nonlinear optical crystal, but typically demonstrates an unpredicted residual absorption peak all around 15 μm which significantly deteriorates the crystal effectiveness. The structural origin of residual absorption remains to be below discussion.
′�?, with a frequency of 295 cm−1, is attributed towards the stretching vibration of Ga–Se bonds. The two-phonon absorption on the 295 cm−1 phonon corresponds on the crystal IR absorption edge, rather than the residual absorption peak. Density functional theory computations show that the residual absorption of the BGSe crystal originates in the OSe defect (Se is substituted by O).