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Substantial efficiency and significant peak electricity picosecond mid-infrared optical parametric amplifier depending on BaGa4Se7 crystal.
We report new experimental success around the stage-matching Attributes of the BaGa4Se7 crystal for harmonic technology of a Nd:YAG laser-pumped AgGaS2 optical parametric oscillator (OPO) plus a CO2 laser…
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Phonons tend to be the crucial players in infrared absorptions, specifically in Center and much infrared ranges. Additionally, the propagation of terahertz phonon-polaritons6 are reported7 and superior nonlinear coefficients for terahertz generation are observed in BaGa4Se7 crystals. Both equally phenomena are the effects of resonances among photons and BaGa4Se7 phonons. Consequently, a thorough investigation with the phonon buildings of BaGa4Se7 is critical to be able to comprehend its behaviors starting from infrared to terahertz.
The yellow transparent BaGa4Se7 crystals Within this analyze ended up grown via the Bridgeman method4,18. A few samples have been geared up by slicing along distinctive dielectric frame directions (xyz directions in Fig. 2), gave top surfaces with typical directions in x, y, z Instructions, and had been defined as , , crystals. They've got typical sizing of 13 × 8 × three mm3 with the thinnest route in the normal direction. The polarized Raman experiments ended up performed on the Horiba HR-800 Raman system having a 532 nm excitation laser. The excitation light at the scale of 1 mW have been centered on the highest surfaces of the samples with a 100×, NA�?�?.nine goal mounted in the backscattering Raman configuration. Polarized Raman measurements were done with spectra information named appropriately towards the configurations; for instance, xyz spectrum means: the sample is crystal and its major floor’s normal course is in x route, the incident gentle’s polarization is in y course, the analyzer’s polarization is in z route.
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The BaGa4Se7 (BGSe) crystal is a wonderful mid- and much-IR nonlinear optical crystal, but generally reveals an surprising residual absorption peak all over 15 μm which considerably deteriorates the crystal efficiency. The structural origin of residual absorption continues to be under debate.
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