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two–10.eight-µm wavelength location. Yet another important limitation from the pump energy linked having a thermal lensing result in crystal was firm experimentally. A comparison was made from AgGaSe2 and ZnGeP2 crystals as elements suitable for the effective era of the 2nd harmonic of cw CO2 laser radiation.
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New middle infrared nonlinear optical crystals of BaGa2GeX6(X=S, Se) are synthesized. The structures of both equally BaGa2GeS6 and BaGa2GeSe6 had been uncovered for being isomorphous exhibiting A 3-dimensional framework built via the parallel alignment of Ga or Ge tetrahedron groups along the c-aix. The ultraviolet transmittance spectrum implies the quick-wavelength absorption edges of BaGa2GeS6 and BaGa2GeSe6 are 380 nm and 440 nm, respectively.
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0 Summary Abstract: BaGa4Se7 (BGSe) and BaGa2GeSe6 (BGGSe) crystals are novel infrared nonlinear optical supplies independently designed by Chinese researchers. Due to the exceptional complete effectiveness plus the critical software price in laser sector, they've got captivated Considerably awareness in the home and overseas.
The progress of crystal expansion and laser output of BGSe and BGGSe are summarized, and the future improvement is prospected.
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Unique emphasis might be provided to the current complex limitations and availability of pump laser features and nonlinear crystal Qualities. Read far more
It's been identified the optical nonlinear coefficients d31 and d22 in LiNbO3 are of reverse signal, in disagreement having an before report by Other individuals. This is an important thing to consider for optimizing nonlinear optical interactions in LiNbO3.
The highest frequency conversion efficiency of 10⁻⁴ was attained for a comparatively new PbIn6Te10 crystal, that's an get of magnitude higher than former outcomes.
The pump pulse Electrical power was controlled by a variable diffraction attenuator. Its polarization was tuned by ninety° using a fifty percent-wave plate because it needed to be regular wave within the BGGSe (when AGS crystal was utilized, the sign beam polarization was tuned). The sign beam was concentrated by spherical mirror (M2, the focal length of 2 m) right into a gas tube of 1.
The nature of the instability and DFG energy decrease is not distinct for us. Certainly one of the reasons may be similar with a nonlinear absorption and plasma development, respectively, that triggers reflection/scattering/absorption in the longwave mid-IR pulse. The dependence of BGGSe transmittance on BaGa2GeSe6 Crystal pump pulse Vitality is presented in Fig.